Global assessment of undiscovered copper resources

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What does this data set describe?

Title: Global assessment of undiscovered copper resources
Abstract:
Deposits, prospects, and permissive tracts for porphyry and sediment-hosted copper resources worldwide, with estimates of undiscovered copper resources.

pCu_tracts contains vector data (polygon) for 192 tracts permissive for porphyry copper mineralization. The tracts outline principal areas of the world that have potential for undiscovered porphyry copper resources; the tracts were used to estimate the probable amounts of those resources at depths within 1 km below the earth's surface. Attributes include tract identifiers, tract name, location coordinates, country and state or province, grade/tonnage model used to assess tract, a brief description of the basis for tract delineation, age, assessment results, and multiple economic results.

pCu_deps_pros includes data on porphyry copper deposits and prospects compiled from eighteen regional datasets that were prepared as part of the U.S. Geological Survey's Global Mineral Resource Assessment Project over a period of years ranging from 2008 through 2015. These data were reviewed and edited to both correct errors and to better fit a standard data model. Major enhancements include more specific age information, and the rounding of calculated values for tonnage and the Au/Mo ratio to the nearest significant figure. In addition, all references cited were compiled; full references were standardized and URLs were included where available.

Copper resources are reported for related deposits in close proximity to each other; grade and tonnage information was combined for these deposits and is reported in the pCu_group table. The feature class pCu_groups contains a small, select set of 47 records each of which represents a group of related deposits and prospects; data were compiled from the feature class pCu_deps_pros. Location coordinates can represent a generalized location or a specific mineralized site; for all of the deposits in the group, grade represents the weighted average while tonnage represents the total ore tonnage.

sedCu_tracts includes polygons that represent 48 permissive tracts for sediment-hosted copper deposits of the world. These are the principal areas in the world that have potential for undiscovered sediment-hosted copper resources. Those with a quantitative estimate were assessed to depths of 1 to 2.5 km below the earth's surface.

sedCu_deps_pros contains points that represent sediment-hosted copper deposits and prospects of the world. Data were compiled from nine regional assessment reports into two datasets that provide data for use in an assessment of undiscovered sediment-hosted stratabound copper resources of the world. These data describe deposits, prospects, and other mineralized sites.
  1. How might this data set be cited?
    Dicken, Connie L., Dunlap, Pamela, Parks, Heather L., Hammarstrom, Jane M., Zientek, Michael L., and Johnson, Kathleen M., 2016, Global assessment of undiscovered copper resources: Scientific Investigations Report 2010-5090-Z, U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -180
    East_Bounding_Coordinate: 180
    North_Bounding_Coordinate: 73.91
    South_Bounding_Coordinate: -55.98
  3. What does it look like?
    https://mrdata.usgs.gov/sir20105090z/sir20105090z-large.png (PNG)
    Reduced-size map showing permissive tracts for porphyry copper and sediment-hosted copper worldwide, (540 x 270 pixels)
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2016
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (3467)
      • G-Polygon (240)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is World Geodetic System 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?
    datadxny
    Data dictionary, explaining tables and fields (Source: USGS)
    id
    Record ID.

    Row identifier within datadxny table Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:283
    Resolution:1
    tblorder
    Table order.

    Order in which this table should appear in some presentations Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:10
    Resolution:1
    tblname
    Table name.

    Name of the table Textual values of no more than 20 characters. (Source: this data release)
    number
    Ordinal position.

    Order in which this field occurs in the RDBMS Integer values. Integer of width 4. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for number.
    Range of values
    Minimum:1
    Maximum:73
    Resolution:1
    label
    Field label.

    Label of the field in the RDBMS Textual values of no more than 32 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for label.
    category
    Category.

    General category of information provided by the contents of the field Textual values of no more than 50 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 9 records have no value for category.
    short_desc
    Short description.

    Descriptive name of the field used in some presentations, not constrained by rules affecting the label Textual values of no more than 40 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for short_desc.
    description
    Description.

    Longer description of the purpose and contents of the field Textual values of no more than 4096 characters. (Source: this data release)
    link
    Link.

    URL providing more information about the field Textual values of no more than 96 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 283 records have no value for link.
    origin
    Origin of field.

    Abbreviation of an organization, data set, or other entity responsible for defining the field Textual values of no more than 12 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 283 records have no value for origin.
    sqltype
    SQL type.

    Data type of the field as used in the RDBMS Textual values of no more than 8 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for sqltype.
    dbftype
    DBF field type.

    Data type of the field when expressed in DBF Textual values of no more than 1 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for dbftype.
    width
    Field width.

    Field width when expressed in DBF Integer values. Integer of width 4. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 132 records have no value for width.
    Range of values
    Minimum:1
    Maximum:4096
    Resolution:1
    prec
    Precision.

    Precision of the field (places to right of decimal) when expressed in DBF, only for numeric fields Integer values. Integer of width 4. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 213 records have no value for prec.
    Range of values
    Minimum:0
    Maximum:0
    Resolution:1
    units
    Units of measure.

    Units of measure of the field values Textual values of no more than 64 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 283 records have no value for units.
    nodata
    No-data value.

    Special value assigned to indicate that no information is available, usually used for numeric fields where a blank field might be intererpreted as the legitimate, but incorrect value zero. Textual values of no more than 16 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 234 records have no value for nodata.
    pcu_deps_pros
    Porphyry copper deposits and prospects (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:2338
    Resolution:1
    gmrap_id
    GMRAP ID.

    Unique identifier for each record. [GMRAP, Global Mineral Resource Assessment Project.] Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:9996
    Resolution:1
    coded_id
    Tract ID.

    Coded, unique identifier assigned to permissive tract within which the site is located; corresponds to Coded_ID in the feature class pCu_tracts. Textual values of no more than 16 characters. (Source: this data release)
    tract_name
    Tract name.

    Name of permissive tract in which the site is located; corresponds to Tract_name in the feature class pCu_tracts. Textual values of no more than 64 characters. (Source: this data release)
    name
    Site name.

    Site name. Textual values of no more than 44 characters. (Source: this data release)
    name_other
    Alternate names.

    Other names used for the site. Textual values of no more than 100 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1250 records have no value for name_other.
    name_group
    Group name.

    Group name, applied when 2-km rule was used to cluster deposits and (or) prospects for the purpose of calculating grades and tonnages. Textual values of no more than 28 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1914 records have no value for name_group.
    includes
    Included sites.

    Names of deposits and (or) prospects that were combined with the primary deposit as a result of the 2-km spatial aggregation rule used for calculating grades and tonnages, OR sites described in the original source reference(s) as being included in the description of primary site. Textual values of no more than 256 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1749 records have no value for includes.
    sitestatus
    Site status.

    Type of site; deposit is a site for which grade and tonnage are reported; prospect is a site for which grade and tonnage are not reported. Textual values of no more than 12 characters. (Source: this data release)
    country
    Country.

    Country in which site is located. Textual values of no more than 56 characters. (Source: this data release)
    state_prov
    State or province.

    State, province or region in which the site is located. Textual values of no more than 44 characters. (Source: this data release)
    latitude
    Latitude.

    Latitude, in decimal degrees; positive number represents latitude north of the equator; negative number indicates latitude south of the equator. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-48.075
    Maximum:68.700026
    longitude
    Longitude.

    Longitude, in decimal degrees; positive number represents longitude east of the Greenwich meridian; negative number represents longitude west of the Greenwich meridian. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-161.1
    Maximum:179.391531
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 48 characters. (Source: this data release)
    dep_subtype
    Deposit subtype.

    Subtype of porphyry copper deposit type based on ratio of Au (g/t) to Mo (weight percent); entries include Cu-Au, Cu-Mo and NA (not applicable). Textual values of no more than 8 characters. (Source: this data release)
    age_ma
    Age (Ma).

    Age of mineralization; in millions of years before the present; based on reported absolute ages, or midpoints of ranges of absolute ages, or midpoints of geologic time scale units. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1299 records have no value for age_ma.
    Range of values
    Minimum:0.5
    Maximum:1990
    age_method
    Age determination method.

    Method used to determine age reported in field Age_Ma. Textual values of no more than 68 characters. (Source: this data release)
    age_range
    Age range.

    Range of ages, listed from oldest to youngest; in absolute ages or in geologic time units. Textual values of no more than 144 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 212 records have no value for age_range.
    age_ref
    Age reference.

    Abbreviated citation, in author and year format, for reference(s) for age information; full references are listed in the FGDB standalone table pCu_sites_references. Textual values of no more than 104 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 232 records have no value for age_ref.
    comm_major
    Major commodities.

    Major commodities, listed in decreasing order of economic importance. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 40 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 115 records have no value for comm_major.
    comm_minor
    Minor commodities.

    Minor commodities, listed in decreasing order of economic importance; queried where uncertain. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 44 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1685 records have no value for comm_minor.
    comm_trace
    Trace commodities.

    Trace commodities, listed in decreasing order of economic importance. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 28 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2107 records have no value for comm_trace.
    tonnage_mt
    Tonnage (Mt).

    Ore tonnage, for deposit, in millions of metric tons (Mt). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1670 records have no value for tonnage_mt.
    Range of values
    Minimum:1
    Maximum:21277
    cu_pct
    Cu grade (%).

    Average copper grade, for deposit, in weight percent. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1672 records have no value for cu_pct.
    Range of values
    Minimum:0.028
    Maximum:1.57
    mo_pct
    Mo grade (%).

    Average molybdenum grade, for deposit, in weight percent. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1929 records have no value for mo_pct.
    Range of values
    Minimum:0.0005
    Maximum:0.1
    au_g_t
    Au grade (g/t).

    Average gold grade, for deposit, in grams per metric ton (g/t). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1874 records have no value for au_g_t.
    Range of values
    Minimum:0.0011
    Maximum:6.6
    ag_g_t
    Ag grade (g/t).

    Average silver grade, for deposit, in grams per metric ton (g/t); Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 2004 records have no value for ag_g_t.
    Range of values
    Minimum:0.081
    Maximum:65
    con_cu_t
    Contained copper.

    Contained copper, for deposit, in metric tons (t), rounded to nearest significant figure; Con_Cu_t = Tonnage_Mt*1,000,000*Cu_pct/100 where SiteStatus=deposit. Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1672 records have no value for con_cu_t.
    Range of values
    Minimum:16000
    Maximum:130000000
    Resolution:1
    au_mo
    Gold-Moly ratio.

    Ratio of Au (g/t) to Mo (weight percent), for deposit, rounded to nearest significant figure; Au_Mo = Au_g_t/Mo_pct where SiteStatus=deposit. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 2026 records have no value for au_mo.
    Range of values
    Minimum:0.1
    Maximum:1000
    comments
    Comments.

    Significant comments; may include grade and tonnage information for prospects, name of magmatic arc or belt. Textual values of no more than 1872 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 153 records have no value for comments.
    minerals
    Minerals.

    Minerals present, as reported in literature cited; listed in alphabetical order. Most rock-forming minerals such as feldspar and quartz are not reported. Textual values of no more than 556 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 982 records have no value for minerals.
    assd_rock
    Associated rocks.

    Associated rocks in the deposit and on regional source map. Textual values of no more than 388 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 821 records have no value for assd_rock.
    dev_status
    Development status.

    The status or nature of operations at the time the record was entered or this field was last modified. Textual values of no more than 16 characters. (Source: this data release)
    ref_list
    References.

    List of abbreviated citations, in author and year format, for references used in compiling information for site, delimited by semicolons; full references are listed in the FGDB standalone table pCu_sites_references. Textual values of no more than 800 characters. (Source: this data release)
    setting
    Tectonic setting.

    Tectonic setting in which mineralization was emplaced. Textual values of no more than 24 characters. (Source: this data release)
    study_area
    Study area name.

    Geographic area of USGS report from which data were originally compiled. Textual values of no more than 40 characters. (Source: this data release)
    short_ref
    Site reference.

    Abbreviated citation for author and year of the USGS regional report from which data were originally compiled; full reference located in the lineage section of the metadata and listed in file geodatabase standalone table pCu_tracts_references. Textual values of no more than 76 characters. (Source: this data release)
    strat_age
    Stratigraphic age.

    Stratigraphic age; Eon, Era or Period. Textual values of no more than 56 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 212 records have no value for strat_age.
    pcu_groups
    Groups of closely-related porphyry copper deposits, for which characteristics such as grade and tonnage are aggregated (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:47
    Resolution:1
    gmrap_id
    GMRAP ID.

    Unique identifier for each record. [GMRAP, Global Mineral Resource Assessment Project.] Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:5000
    Maximum:5060
    Resolution:1
    coded_id
    Tract ID.

    Coded, unique identifier assigned to permissive tract. Textual values of no more than 16 characters. (Source: this data release)
    tract_name
    Tract name.

    Informal name of permissive tract. Textual values of no more than 56 characters. (Source: this data release)
    name_group
    Group name.

    Group name, applied when 2-km rule was used to cluster deposits and (or) prospects for the purpose of calculating grades and tonnages. Textual values of no more than 24 characters. (Source: this data release)
    includes
    Included sites.

    Names of deposits and prospects that have been grouped as a result of the 2-km aggregation rule used for calculating grades and tonnages. Textual values of no more than 252 characters. (Source: this data release)
    sitestatus
    Site status.

    Type of site; deposit is a site for which grade and tonnage are reported; prospect is a site for which grade and tonnage are not reported. Textual values of no more than 8 characters. (Source: this data release)
    country
    Country.

    Country in which site is located. Textual values of no more than 48 characters. (Source: this data release)
    state_prov
    State or province.

    State, province or region. Textual values of no more than 36 characters. (Source: this data release)
    latitude
    Latitude.

    Latitude, in decimal degrees, for a general location of the group; positive number represents latitude north of the equator; negative number indicates latitude south of the equator. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-34.327824
    Maximum:58.213604609
    longitude
    Longitude.

    Longitude, in decimal degrees, for a general location of the group; positive number represents longitude east of the Greenwich meridian; negative number represents longitude west of the Greenwich meridian. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-131.794220144
    Maximum:178.187
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 20 characters. (Source: this data release)
    dep_subtype
    Deposit subtype.

    Subtype of porphyry copper deposit type. Textual values of no more than 8 characters. (Source: this data release)
    age_ma
    Age (Ma).

    Age of mineralization; reported as absolute age, or midpoint of range of absolute ages, or midpoint of geologic time scale unit(s). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 11 records have no value for age_ma.
    Range of values
    Minimum:6.7
    Maximum:456
    age_method
    Age determination method.

    Method used to determine age reported in field Age_Ma. Textual values of no more than 60 characters. (Source: this data release)
    age_range
    Age range.

    Range of ages, listed from oldest to youngest. Textual values of no more than 76 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2 records have no value for age_range.
    age_ref
    Age reference.

    Abbreviated citation, in author and year format, for reference(s) for age information; full references are listed in the FGDB standalone table pCu_sites_references. Textual values of no more than 84 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2 records have no value for age_ref.
    comm_major
    Major commodities.

    Major commodities, listed in decreasing order of economic importance. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 24 characters. (Source: this data release)
    comm_minor
    Minor commodities.

    Minor commodities, listed in decreasing order of economic importance; queried where uncertain. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 16 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 23 records have no value for comm_minor.
    comm_trace
    Trace commodities.

    Trace commodities, listed in decreasing order of economic importance. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 20 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 37 records have no value for comm_trace.
    tonnage_mt
    Tonnage (Mt).

    Total ore tonnage for all deposits in the group, in millions of metric tons (Mt). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 12 records have no value for tonnage_mt.
    Range of values
    Minimum:23
    Maximum:4692
    cu_pct
    Cu grade (%).

    Weighted average copper grade, for all deposits in the group, in weight percent, where weighted average resulting from the multiplication of each component by a factor reflecting its importance. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 12 records have no value for cu_pct.
    Range of values
    Minimum:0.15
    Maximum:0.9
    mo_pct
    Mo grade (%).

    Weighted average molybdenum grade, for all deposits in the group, in weight percent, where weighted average resulting from the multiplication of each component by a factor reflecting its importance. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 26 records have no value for mo_pct.
    Range of values
    Minimum:0.001
    Maximum:0.022
    au_g_t
    Au grade (g/t).

    Weighted average gold grade, for all deposits in the group, in grams per metric ton (g/t), where weighted average resulting from the multiplication of each component by a factor reflecting its importance. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 17 records have no value for au_g_t.
    Range of values
    Minimum:0.005
    Maximum:0.59
    ag_g_t
    Ag grade (g/t).

    Weighted average silver grade, for all deposits in the group, in grams per metric ton (g/t), where weighted average resulting from the multiplication of each component by a factor reflecting its importance. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 31 records have no value for ag_g_t.
    Range of values
    Minimum:0.08
    Maximum:9.52
    con_cu_t
    Contained copper.

    Total contained copper, for all deposits in the group, in metric tons (t), rounded to nearest significant figure; Con_Cu_t = Tonnage_Mt*1,000,000*Cu_pct/100 where SiteStatus=deposit. Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 12 records have no value for con_cu_t.
    Range of values
    Minimum:104000
    Maximum:23000000
    Resolution:1
    au_mo
    Gold-Moly ratio.

    Ratio of Au (g/t) to Mo (weight percent), rounded to nearest significant figure; Au_Mo = Au_g_t/Mo_pct where SiteStatus=deposit. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for au_mo.
    Range of values
    Minimum:0
    Maximum:200
    comments
    Comments.

    All significant comments; may include grade and tonnage information for prospects, name of magmatic arc or belt. Textual values of no more than 460 characters. (Source: this data release)
    minerals
    Minerals.

    Minerals present, as reported in literature cited; listed in alphabetical order. Most rock-forming minerals such as feldspar and quartz are not reported. Textual values of no more than 500 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 3 records have no value for minerals.
    assd_rock
    Associated rocks.

    Associated rocks in the deposit and on regional source map. Textual values of no more than 188 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 3 records have no value for assd_rock.
    dev_status
    Development status.

    The status or nature of operations at the time the record was entered or this field was last modified. Textual values of no more than 16 characters. (Source: this data release)
    ref_list
    References.

    All reference(s) for data in this record, in author(s) and year format, delimited by semicolons. See file geodatabase table "pCu_sites_references" for complete source references (listed by deposit or prospect). Textual values of no more than 800 characters. (Source: this data release)
    setting
    Tectonic setting.

    Tectonic setting in which mineralization was emplaced. Textual values of no more than 24 characters. (Source: this data release)
    study_area
    Study area name.

    Geographic area of USGS report from which data were originally compiled. Textual values of no more than 40 characters. (Source: this data release)
    short_ref
    Site reference.

    Abbreviated citation for author and year of the USGS regional report from which data were originally compiled; full reference located in the lineage section of the metadata and listed in file geodatabase standalone table pCu_tracts_references. Textual values of no more than 44 characters. (Source: this data release)
    strat_age
    Stratigraphic age.

    Stratigraphic age; Eon, Era or Period Textual values of no more than 36 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2 records have no value for strat_age.
    pcu_precambrian_deps_pros
    Precambrian porphyry copper deposits and prospects. Not used directly in the assessment, provided for reference. (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:22
    Resolution:1
    name
    Site name.

    Site name. Textual values of no more than 16 characters. (Source: this data release)
    name_other
    Alternate names.

    Other names used for the site. Textual values of no more than 24 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 16 records have no value for name_other.
    includes
    Included sites.

    Names of deposits and (or) prospects that were combined with the primary deposit as a result of the 2-km spatial aggregation rule used for calculating grades and tonnages, OR sites described in the original source reference(s) as being included in the description of primary site. Textual values of no more than 40 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 19 records have no value for includes.
    sitestatus
    Site status.

    Type of site; deposit is a site for which grade and tonnage are reported; prospect is a site for which grade and tonnage are not reported. Textual values of no more than 12 characters. (Source: this data release)
    country
    Country.

    Country in which the site is located. Textual values of no more than 12 characters. (Source: this data release)
    stateprov
    State or province.

    State, province or region in which the site is located. Textual values of no more than 20 characters. (Source: this data release)
    latitude
    Latitude.

    Latitude, in decimal degrees; positive number represents latitude north of the equator; negative number indicates latitude south of the equator. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-28.683333
    Maximum:67.0725
    longitude
    Longitude.

    Longitude, in decimal degrees; positive number represents longitude east of the Greenwich meridian; negative number represents longitude west of the Greenwich meridian. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-91
    Maximum:120.108333
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 20 characters. (Source: this data release)
    dep_subtype
    Deposit subtype.

    Subtype of porphyry copper deposit type. Textual values of no more than 8 characters. (Source: this data release)
    age_ma
    Age (Ma).

    Age of mineralization; in millions of years before the present; based on reported absolute ages, or midpoints of ranges of absolute ages, or midpoints of geologic time scale units. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:621
    Maximum:3234
    Resolution:1
    tonnage
    Tonnage (Mt).

    Ore tonnage, for deposit, in millions of metric tons (Mt). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1340
    Resolution:1
    cu_pct
    Cu grade (%).

    Average copper grade, for deposit, in weight percent. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.83
    mo_pct
    Mo grade (%).

    Average molybdenum grade, for deposit, in weight percent. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.09
    au_g_t
    Au grade (g/t).

    Average gold grade, for deposit, in grams per metric ton (g/t). Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.35
    ag_g_t
    Ag grade (g/t).

    Average silver grade, for deposit, in grams per metric ton (g/t). Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:6
    pcu_sites_references
    Bibliographic references used for porphyry copper deposits and prospects (Source: USGS)
    objectid
    Feature ID.

    Record identifier for the table row Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:7931
    Resolution:1
    relate_id
    Relate ID.

    Relationship identifier used in ArcGIS software Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:7931
    Resolution:1
    gmrap_id
    GMRAP ID.

    Identifier for the mine, prospect, or occurrence as known to the project that created these data Integer values. Integer of width 6. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:9996
    Resolution:1
    coded_id
    Tract ID.

    Identifier for the permissive tract containing the site. The deposit model of the site must match the target deposit model of the permissive tract. Textual values of no more than 16 characters. (Source: this data release)
    name
    Site name.

    Name of the site to which this reference pertains Textual values of no more than 44 characters. (Source: this data release)
    auth_year
    Short reference.

    Author and year of publication of the reference, used as in-text citation or to sort these records in a list. Textual values of no more than 84 characters. (Source: this data release)
    citation
    Full reference.

    Bibliographic reference in the form it would appear in a published journal article, using USGS style conventions. Textual values of no more than 788 characters. (Source: this data release)
    web_link
    Online linkage.

    A URL or other web link for the publication Textual values of no more than 220 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2621 records have no value for web_link.
    region
    Region.

    Name of the geographic region to which the reference pertains, and in which the site lies. Textual values of no more than 40 characters. (Source: this data release)
    pcu_tracts
    Permissive tracts for porphyry copper deposits (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:208
    Resolution:1
    coded_id
    Tract ID.

    Coded, unique identifier assigned to permissive tract. [3 digit region code] pCu [4 digit tract number] Textual values of no more than 16 characters. (Source: this data release)
    tract_name
    Tract name.

    Informal name of permissive tract. Textual values of no more than 64 characters. (Source: this data release)
    unregcode
    UN region code.

    Three digit United Nations code for the region that underlies most of the permissive tract. (ISO 3166-1 numeric) Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:3
    Maximum:150
    Resolution:1
    country
    Country.

    Country(ies) in which permissive tract is located Textual values of no more than 108 characters. (Source: this data release)
    commodity
    Commodity.

    Primary commodity being assessed Textual values of no more than 8 characters. (Source: this data release)
    study_area
    Study area name.

    Geographic area of USGS report from which data were originally compiled. Textual values of no more than 60 characters. (Source: this data release)
    quant
    Quantitative assessment.

    Dichotomous variable for whether or not a quantitative resource assessment was performed for tract. Textual values of no more than 8 characters. (Source: this data release)
    region
    Region.

    Name of large geographic region used for reporting copper resources in Johnson and others (2014). Textual values of no more than 40 characters. (Source: this data release)
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 20 characters. (Source: this data release)
    gt_model
    Grade-tonnage model.

    Grade-tonnage model used for the undiscovered deposit simulation. Textual values of no more than 72 characters. (Source: this data release)
    geology
    Geologic feature.

    Geologic feature assessed. Textual values of no more than 260 characters. (Source: this data release)
    age
    Geologic feature age.

    Age of the assessed geologic feature. Textual values of no more than 44 characters. (Source: this data release)
    age_group
    Generalized age.

    Generalized geologic age. Textual values of no more than 24 characters. (Source: this data release)
    asmt_date
    Assessment date.

    Year assessment was conducted. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:2005
    Maximum:2015
    Resolution:1
    asmt_depth
    Assessment depth.

    Maximum depth beneath the Earth's surface used for the assessment, in kilometers. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:1
    Resolution:1
    n90
    Est deposits 90%.

    Estimated number of deposits associated with the 90th percentile (90 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n90.
    Range of values
    Minimum:0
    Maximum:10
    Resolution:1
    n50
    Est deposits 50%.

    Estimated number of deposits associated with the 50th percentile (50 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n50.
    Range of values
    Minimum:0
    Maximum:20
    Resolution:1
    n10
    Est deposits 10%.

    Estimated number of deposits associated with the 10th percentile (10 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n10.
    Range of values
    Minimum:0
    Maximum:100
    Resolution:1
    n05
    Est deposits 5%.

    Estimated number of deposits associated with the 5th percentile (5 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n05.
    Range of values
    Minimum:0
    Maximum:100
    Resolution:1
    n01
    Est deposits 1%.

    Estimated number of deposits associated with the 1st percentile (1 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n01.
    Range of values
    Minimum:0
    Maximum:100
    Resolution:1
    n_expected
    Mean estimated deposits.

    Expected (mean) number of deposits, where N_expected = (0.233*N90) + (0.4*N50) + (0.225*N10) + (0.045*N05) + (0.03*N01). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for n_expected.
    Range of values
    Minimum:0
    Maximum:40.33
    s
    Standard deviation.

    Standard deviation, where s = 0.121 - (0.237*N90) - (0.093*N50) + (0.183*N10) + (0.073*N05) + (0.123*N01) Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for s.
    Range of values
    Minimum:0
    Maximum:33.79
    cv_percent
    Coefficient of variance.

    Coefficient of variance, in percent, where Cv = (s/N_expected) * 100. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for cv_percent.
    Range of values
    Minimum:0
    Maximum:2.11
    est_levels
    Confidence levels.

    The set of percentile (probability) levels at which undiscovered deposit estimates were made. Textual values of no more than 16 characters. (Source: this data release)
    n_known
    Known deposits.

    Number of known deposits in the tract. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:46
    Resolution:1
    n_total
    Total deposits.

    Total number of deposits, where N_total = N_expected + N_known. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:62.06
    area_km2
    Area (sq km).

    Area of permissive tract calculated in a locally appropriate equal-area projection, in square kilometers. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1170920
    Resolution:1
    depdensity
    Deposit density (sq km).

    Deposit density (total number of deposits per square kilometer), where DepDensity = N_total/Area_km2. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for depdensity.
    Range of values
    Minimum:0
    Maximum:0.00246
    depden10e5
    Deposit density (10e5 sq km).

    Deposit density per 100,000 square kilometers, where DepDen10E5 = DepDensity*100,000. Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 25 records have no value for depden10e5.
    Range of values
    Minimum:0
    Maximum:246
    Resolution:1
    estimators
    Estimators.

    Names of people on the estimation team. Textual values of no more than 256 characters. (Source: this data release)
    mean_cu_t
    Mean Cu tonnage.

    Mean copper resources, in metric tons, based on Monte Carlo simulation. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:210000000
    Resolution:1
    mean_mo_t
    Mean Mo tonnage.

    Mean molybdenum resources, in metric tons, based on Monte Carlo simulation. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:6300000
    Resolution:1
    mean_au_t
    Mean Au tonnage.

    Mean gold resources, in metric tons, based on Monte Carlo simulation. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:3800
    Resolution:1
    mean_ag_t
    Mean Ag tonnage.

    Mean silver resources, in metric tons, based on Monte Carlo simulation. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:70000
    Resolution:1
    mean_rock_mt
    Mean ore tonnage.

    Mean ore tonnage, in metric tons, based on Monte Carlo simulation. Bigint of width . (Source: this data release)
    cu_95
    Undiscovered Cu, 95%.

    Undiscovered copper resource estimate, 95th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:22000000
    Resolution:1
    cu_90
    Undiscovered Cu, 90%.

    Undiscovered copper resource estimate, 90th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:46000000
    Resolution:1
    cu_50
    Undiscovered Cu, 50%.

    Undiscovered copper resource estimate, median (50th percentile) value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:190000000
    Resolution:1
    cu_10
    Undiscovered Cu, 10%.

    Undiscovered copper resource estimate, 10th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:400000000
    Resolution:1
    cu_05
    Undiscovered Cu, 5%.

    Undiscovered copper resource estimate, 5th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:470000000
    Resolution:1
    prob_mean
    Probability of mean.

    Probability of the mean value, undiscovered copper resource estimate. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.46
    prob_0_cu
    Probability of no Cu.

    Probability of no copper, based on Monte Carlo simulation. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.71
    ident_cu
    Identified Cu resources.

    Known copper resources, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:340000000
    Resolution:1
    n_prospects
    Known prospects.

    Number of identified porphyry copper prospects in tract. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:65
    Resolution:1
    scales
    Map scales used.

    List of map scales used, by denominator, to delineate tract boundary. Textual values of no more than 32 characters. (Source: this data release)
    begin_age
    Oldest rocks age.

    Oldest age of permissive rocks in the tract, from geologic source maps, in millions of years before the present. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:5.3
    Maximum:2100
    end_age
    Youngest rocks age.

    Youngest age of permissive rocks in the tract, from geologic source maps, in millions of years before the present. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:2100
    duration
    Age range.

    Age range of permissive rocks in the tract, from geologic source maps. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:442
    short_ref
    Reference.

    Abbreviated citation for source reference; full reference located in the lineage section of the metadata and listed in file geodatabase standalone table pCu_tracts_references. Textual values of no more than 108 characters. (Source: this data release)
    meancu_km2
    Mean Cu (t/sq km).

    Mean copper resources per square kilometer, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:8174
    Resolution:1
    ctryfraser
    Fraser country.

    Country used for infrastructure rankings as compiled by the Fraser Institute (McMahon and Cervantes, 2012). Textual values of no more than 96 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 5 records have no value for ctryfraser.
    fras_typ
    Fraser type.

    Percentage of categories 1 and 2, from quality of infrastructure table (McMahon and Cervantes, 2012), used to classify cost setting. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.97
    fras_high
    Fraser high.

    Percentage of categories 3, 4, and 5, from quality of infrastructure table (McMahon and Cervantes, 2012), used to classify cost setting. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1
    typ_cost
    Typical cost.

    Ranking for typical cost, in percent. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1
    high_cost
    High cost.

    Ranking for high cost, in percent. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1
    infra_set
    Infrastructure setting.

    Mine cost setting based on infrastructure development. Textual values of no more than 12 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 9 records have no value for infra_set.
    depth_dist
    Comments on depth.

    Comments on rationale for assignment of depth distributions categories. Textual values of no more than 88 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 25 records have no value for depth_dist.
    d_0_250m
    Depth 0 - 250m.

    Proportion of undiscovered deposits occurring in the interval between the surface and 250 meters in depth. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.35
    d_250_500m
    Depth 250m - 500m.

    Proportion of undiscovered deposits occurring in the interval from 250-500 meters in depth. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.3
    d_over500m
    Depth over 500m.

    Proportion of undiscovered deposits occurring in the interval from 500-1,000 meters in depth. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:0.6
    ec_cu
    Econ recoverable Cu.

    Estimated amount of economically recoverable copper, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:170000000
    Resolution:1
    ec_mo
    Econ recoverable Mo.

    Estimated amount of economically recoverable molybdenum, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:3600000
    Resolution:1
    ec_au
    Econ recoverable Au.

    Estimated amount of economically recoverable gold, in metric tons (t). Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1300
    ec_ag
    Econ recoverable Ag.

    Estimated amount of economically recoverable silver, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:50000
    Resolution:1
    ec_0_prob
    Probability no econ recoverable.

    Probability of no economic resources occurring in the tract, in percent. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1
    ec_nvp
    Econ NPV.

    Net present value of simulated economic deposits in the tract, in million U.S. dollars. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:51000
    Resolution:1
    ev_id
    Exp dollars.

    Expected value of simulated resources in the tract, in million U.S. dollars/100,000 km2. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-87.97
    Maximum:1924.11
    ev_class
    Exp value class.

    Qualitative classification of expected value of simulated resources in the tract. Textual values of no more than 12 characters. (Source: this data release)
    tect_set
    Tectonic setting.

    Tectonic setting. Textual values of no more than 24 characters. (Source: this data release)
    econ_ref
    Economic reference.

    Abbreviated citation for economic source reference; full reference is listed in file geodatabase standalone table pCu_tracts_references. Textual values of no more than 40 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 25 records have no value for econ_ref.
    shape_length
    Perimeter.

    Length of feature in internal units. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:1.98183523949
    Maximum:823.058353604
    shape_area
    Area.

    Area of feature in internal units squared. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0.0513568023928
    Maximum:196.13472178
    pcu_tracts_references
    Bibliographic references used for porphyry copper permissive tracts (Source: USGS)
    objectid
    Feature ID.

    Record identifier in the database table Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:20
    Resolution:1
    short_ref
    Short reference.

    Author and year, used as in-text citation or to sort these references in a list. Textual values of no more than 108 characters. (Source: this data release)
    web_link
    Online linkage.

    URL or other web address for the report cited by the reference. Textual values of no more than 60 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1 records have no value for web_link.
    web_link2
    Online linkage 2.

    Alternative URL or other network address used to locate the report. Textual values of no more than 44 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 19 records have no value for web_link2.
    full_ref
    Reference.

    Bibliographic reference in the form it would appear in a published journal article, using USGS style conventions. Textual values of no more than 796 characters. (Source: this data release)
    sedcu_deps_pros
    Sediment-hosted copper deposits and prospects (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:1202
    Resolution:1
    gmrap_id
    GMRAP ID.

    Unique identifier for each record. [GMRAP, Global Mineral Resource Assessment Project.] Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:11222
    Resolution:1
    coded_id
    Tract ID.

    Coded, unique identifier assigned to permissive tract within which the site is located; corresponds to Coded_ID in the feature class sedCu_tracts. Textual values of no more than 20 characters. (Source: this data release)
    tract_name
    Tract name.

    Name of permissive tract in which the site is located; corresponds to Tract_name in the feature class sedCu_tracts. Textual values of no more than 56 characters. (Source: this data release)
    name
    Site name.

    Site name. Textual values of no more than 52 characters. (Source: this data release)
    name_other
    Alternate names.

    Other names used for the site. Textual values of no more than 128 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1049 records have no value for name_other.
    name_group
    Group name.

    Group name, applied when 500-m rule was used to cluster deposits and (or) prospects. Textual values of no more than 44 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1173 records have no value for name_group.
    includes
    Included sites.

    Names of deposits that have been combined with the primary deposit as a result of the 500-m aggregation rule used for calculating grades and tonnages. Textual values of no more than 252 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1176 records have no value for includes.
    sitestatus
    Site status.

    Type of site. Deposit--a site that has grade and tonnage. Historic mine - 19th century or earlier--a site that is a no longer active historic mine. Prospect--a site with no grade and tonnage values provided. Prospect--a mineralized material estimated: a site that has estimated mineralized material. Site--a site that occurs in sedimentary rock but has no other descriptive information. Textual values of no more than 44 characters. (Source: this data release)
    sitestatus2
    Site status additional.

    Additional information on the status of the site. Textual values of no more than 104 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 1024 records have no value for sitestatus2.
    country
    Country.

    Country in which the site is located. Textual values of no more than 36 characters. (Source: this data release)
    state_prov
    State or province.

    State, province or region in which the site is located. Textual values of no more than 28 characters. (Source: this data release)
    latitude
    Latitude.

    Latitude, in decimal degrees; positive number represents latitude north of the equator; negative number indicates latitude south of the equator. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-39.52452
    Maximum:73.745822
    longitude
    Longitude.

    Longitude, in decimal degrees; positive number represents longitude east of the Greenwich meridian; negative number represents longitude west of the Greenwich meridian. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:-129.57404
    Maximum:119.761494
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 40 characters. (Source: this data release)
    dep_subtype
    Deposit subtype.

    Subtype of sediment-hosted copper. Textual values of no more than 40 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 201 records have no value for dep_subtype.
    age_host
    Host rock age chronostratigraphic.

    Age of host rock, in standard divisions of geologic time. Textual values of no more than 28 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 2 records have no value for age_host.
    age_ma
    Host rock age quantitative.

    Age, in millions of years before present. Age may be an average or midpoint for geologic era, period, or epoch listed. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:1800
    Resolution:1
    unit
    Geologic unit.

    Geologic unit in which site is located. Textual values of no more than 100 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 77 records have no value for unit.
    host_rocks
    Host rock lithology.

    Simplified lithologic description of host rocks. Textual values of no more than 164 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 703 records have no value for host_rocks.
    comm_major
    Major commodity.

    Major commodities, listed in decreasing order of economic importance. Chemical symbols are used for commodities; multiple commodities are comma-delimited. Textual values of no more than 28 characters. (Source: this data release)
    tonnage_mt
    Tonnage (Mt).

    Ore tonnage, for deposit, in millions of metric tons (Mt). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1016 records have no value for tonnage_mt.
    Range of values
    Minimum:0.011
    Maximum:3612.499
    cu_pct
    Cu grade (%).

    Average copper grade, for deposit, in weight percent. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1013 records have no value for cu_pct.
    Range of values
    Minimum:0.3
    Maximum:6.59
    co_pct
    Co grade (%).

    Average cobalt grade, in weight percent. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1144 records have no value for co_pct.
    Range of values
    Minimum:0.01
    Maximum:2.308
    ag_g_t
    Ag grade (g/t).

    Average silver grade, for deposit, in grams per metric ton (g/t). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1185 records have no value for ag_g_t.
    Range of values
    Minimum:5
    Maximum:137.6
    con_cu_t
    Contained Cu (t).

    Contained copper, for deposit, in metric tons (t), rounded to nearest significant figure. Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 1012 records have no value for con_cu_t.
    Range of values
    Minimum:210
    Maximum:72000000
    Resolution:1
    comments
    Comments.

    Significant comments. Textual values of no more than 260 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 682 records have no value for comments.
    minerals
    Minerals.

    Ore and gangue minerals, listed in approximate order of abundance. Textual values of no more than 188 characters. (Source: this data release)
    ValueDefinition
    (no value)Information not available for this record. 966 records have no value for minerals.
    ref_list
    References.

    List of abbreviated citations, in author and year format, for references used in compiling information for site, delimited by semicolons; full references are listed in the file geodatabase nonspatial table, sedCu_references. Textual values of no more than 256 characters. (Source: this data release)
    short_ref
    Site reference.

    Abbreviated citation for author and year of the USGS regional report from which data were originally compiled; full reference located in the lineage section of the metadata and listed in file geodatabase nonspatial table sedCu_references. Textual values of no more than 44 characters. (Source: this data release)
    sedcu_references
    Bibliographic references used for sediment-hosted copper deposits (Source: USGS)
    objectid
    Feature ID.

    Record identifier of the bibliography entry. Integer values. Integer of width 4. (Source: this data release)
    Range of values
    Minimum:1
    Maximum:214
    Resolution:1
    ref_short
    Short reference.

    Author and year, used as in-text citation or to sort these references in a list. Textual values of no more than 84 characters. (Source: this data release)
    full_ref
    Reference.

    Bibliographic reference in the form it would appear in a published journal article, using USGS style conventions. Textual values of no more than 768 characters. (Source: this data release)
    sedcu_tracts
    Permissive tracts for sediment-hosted copper deposits (Source: USGS)
    objectid
    Feature ID.

    Internal feature number. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1
    Maximum:48
    Resolution:1
    coded_id
    Tract ID.

    Coded, unique identifier assigned to permissive tract. Textual values of no more than 20 characters. (Source: this data release)
    tract_name
    Tract name.

    Informal name of permissive tract. Textual values of no more than 56 characters. (Source: this data release)
    unregcode
    UN region code.

    Three digit UN code for the region that underlies most of the permissive tract. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:2
    Maximum:150
    Resolution:1
    country
    Country.

    Country(ies) in which the permissive tract is located. Textual values of no more than 44 characters. (Source: this data release)
    commodity
    Commodity.

    Primary commodity being assessed. Textual values of no more than 8 characters. (Source: this data release)
    region
    Region.

    Name of geographic region used for reporting copper resources in Johnson and others (2014). Textual values of no more than 40 characters. (Source: this data release)
    basin
    Basin name.

    Name of sedimentary basin in which the permissive tract is located. Textual values of no more than 52 characters. (Source: this data release)
    dep_type
    Deposit type.

    Type of mineral deposit. Textual values of no more than 40 characters. (Source: this data release)
    dep_model
    Deposit model.

    Model used to classify deposit type. Textual values of no more than 72 characters. (Source: this data release)
    dmodel_ref
    Deposit model reference.

    Deposit type model short reference; full reference is provided in nonspatial table sedCu_references. Textual values of no more than 44 characters. (Source: this data release)
    gt_model
    Grade-tonnage model.

    Grade-tonnage model used for the undiscovered deposit estimate. Textual values of no more than 72 characters. (Source: this data release)
    gatm_ref
    GT model reference.

    Abbreviated citation for grade and tonnage model; full reference is provided in the standalone table sedCu_references. Textual values of no more than 36 characters. (Source: this data release)
    geology
    Geologic feature.

    Geologic feature assessed. Textual values of no more than 256 characters. (Source: this data release)
    age
    Geologic feature age.

    Age of the assessed geologic feature. Textual values of no more than 40 characters. (Source: this data release)
    asmt_date
    Assessment date.

    Year assessment was conducted. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:1998
    Maximum:2012
    Resolution:1
    asmt_depth
    Assessment depth.

    Maximum depth beneath the Earth's surface used for the assessment, in kilometers. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:2.5
    est_levels
    Confidence levels.

    The set of percentile (probability) levels at which undiscovered deposit estimates were made. Textual values of no more than 16 characters. (Source: this data release)
    n90
    Est deposits 90%.

    Estimated number of deposits associated with the 90th percentile (90 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n90.
    Range of values
    Minimum:0
    Maximum:50
    Resolution:1
    n50
    Est deposits 50%.

    Estimated number of deposits associated with the 50th percentile (50 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n50.
    Range of values
    Minimum:0
    Maximum:85
    Resolution:1
    n10
    Est deposits 10%.

    Estimated number of deposits associated with the 10th percentile (10 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n10.
    Range of values
    Minimum:0
    Maximum:180
    Resolution:1
    n05
    Est deposits 5%.

    Estimated number of deposits associated with the 5th percentile (5 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n05.
    Range of values
    Minimum:0
    Maximum:180
    Resolution:1
    n01
    Est deposits 1%.

    Estimated number of deposits associated with the 1st percentile (1 percent chance of at least the indicated number of deposits). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n01.
    Range of values
    Minimum:1
    Maximum:180
    Resolution:1
    n_expected
    Mean estimated deposits.

    Expected (mean) number of deposits, where N_expected = (0.233*N90) + (0.4*N50) + (0.225*N10) + (0.045*N05) + (0.03*N01). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for n_expected.
    Range of values
    Minimum:0.03
    Maximum:100
    s
    Standard deviation.

    Standard deviation, where s = 0.121 - (0.237*N90) - (0.093*N50) + (0.183*N10) + (0.073*N05) + (0.123*N01). Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for s.
    Range of values
    Minimum:0.24
    Maximum:49
    cv_percent
    Coefficient of variance.

    Coefficient of variance, in percent, where Cv = (s/N_expected) * 100. Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cv_percent.
    Range of values
    Minimum:26
    Maximum:810
    Resolution:1
    n_known
    Known deposits.

    Number of known deposits in the tract. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:52
    Resolution:1
    n_total
    Total deposits.

    Total number of deposits, where N_total = N_expected + N_known. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0
    Maximum:152
    area_km2
    Area (sq km).

    Area of permissive tract, in square kilometers. Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:129
    Maximum:186791
    Resolution:1
    depdensity
    Deposit density (sq km).

    Deposit density (total number of deposits per square kilometer). DepDensity = N_total/Area_km2. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 4 records have no value for depdensity.
    Range of values
    Minimum:6e-06
    Maximum:0.043
    depden10e5
    Deposit density (10e5 sq km).

    Deposit density per 100,000 square kilometers. DepDen10E5 = DepDensity*100,000. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 4 records have no value for depden10e5.
    Range of values
    Minimum:0.6
    Maximum:4300
    estimators
    Estimators.

    Names of people on the estimation team. Textual values of no more than 208 characters. (Source: this data release)
    ident_cu
    Identified Cu resources.

    Known copper resources, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    Range of values
    Minimum:0
    Maximum:72000000
    Resolution:1
    cu_95
    Undiscovered Cu, 95%.

    Undiscovered copper resource estimate, 95th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cu_95.
    Range of values
    Minimum:0
    Maximum:25000000
    Resolution:1
    cu_90
    Undiscovered Cu, 90%.

    Undiscovered copper resource estimate, 90th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cu_90.
    Range of values
    Minimum:0
    Maximum:49000000
    Resolution:1
    cu_50
    Undiscovered Cu, 50%.

    Undiscovered copper resource estimate, median (50th percentile) value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cu_50.
    Range of values
    Minimum:0
    Maximum:120000000
    Resolution:1
    cu_10
    Undiscovered Cu, 10%.

    Undiscovered copper resource estimate, 10th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cu_10.
    Range of values
    Minimum:0
    Maximum:220000000
    Resolution:1
    cu_05
    Undiscovered Cu, 5%.

    Undiscovered copper resource estimate, 5th percentile value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for cu_05.
    Range of values
    Minimum:0
    Maximum:240000000
    Resolution:1
    mean_cu_t
    Mean Cu tonnage.

    Undiscovered copper resource estimate, mean value, in metric tons (t). Integer values. Integer of width . (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for mean_cu_t.
    Range of values
    Minimum:12000
    Maximum:130000000
    Resolution:1
    prob_mean
    Probability of mean.

    Probability of the mean value, undiscovered copper resource estimate. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for prob_mean.
    Range of values
    Minimum:0.03
    Maximum:0.45
    prob_0_cu
    Probability of no Cu.

    Probability of no undiscovered copper resources. Real numbers stored in double precision. (Source: this data release)
    ValueDefinition
    -9999Information not available for this record. 13 records have no value for prob_0_cu.
    Range of values
    Minimum:0
    Maximum:0.97
    shape_length
    Perimeter.

    Length of feature in internal units. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:1.05683807078
    Maximum:87.4137205449
    shape_area
    Area.

    Area of feature in internal units squared. Real numbers stored in double precision. (Source: this data release)
    Range of values
    Minimum:0.01922248202
    Maximum:19.4584252287
    study_area
    Study area name.

    Geographic area of USGS report from which data were originally compiled. Textual values of no more than 68 characters. (Source: this data release)
    quant
    Quantitative assessment.

    Dichotomous variable for whether or not a quantitative resource assessment was performed for tract. Textual values of no more than 8 characters. (Source: this data release)
    short_ref
    Short reference.

    Abbreviated citation for author and year of the USGS regional report from which data were originally compiled; full reference located in the lineage section of the metadata and listed in file geodatabase standalone table sedCu_references. Textual values of no more than 76 characters. (Source: this data release)
    commodity
    Commodity names or symbols, separated and associated with their importance, to facilitate search. (Source: USGS)
    gmrap_id
    GMRAP ID.

    Unique identifier for each record. [GMRAP, Global Mineral Resource Assessment Project.] Integer values. Integer of width 4. (Source: this data release)
    value
    Commodity.

    Commodity name or symbol, may include question mark in parentheses. Textual values of no more than 8 characters. (Source: this data release)
    role
    Importance.

    Importance of commodity at the site (major, minor, or trace) Textual values of no more than 8 characters. (Source: this data release)
    minerals
    Mineral names, separated, to facilitate search. (Source: USGS)
    gmrap_id
    GMRAP ID.

    Unique identifier for each record. [GMRAP, Global Mineral Resource Assessment Project.] Integer values. Integer of width 4. (Source: this data release)
    value
    Mineral.

    Mineral name, may indicate a group of related minerals, for rare minerals may include a chemical formula. Textual values of no more than 64 characters. (Source: this data release)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Dicken, Connie L.
    • Dunlap, Pamela
    • Parks, Heather L.
    • Hammarstrom, Jane M.
    • Zientek, Michael L.
    • Johnson, Kathleen M.
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Connie Dicken
    Midwest Region
    Geologist
    U.S. Geological Survey
    National Center Mail Stop 954
    12201 Sunrise Valley Dr
    Reston, VA
    USA

    703-648-6482 (voice)
    703-648-6252 (FAX)
    cdicken@usgs.gov

Why was the data set created?

These data are intended to provide, for porphyry copper and sediment-hosted copper deposits, a globally consistent and comprehensive analysis of undiscovered resources. They are intended to equip all nations with a regional and global context for evaluating their mineral resources, planning for new mineral exploration and anticipating the economic, environmental, and social impacts of mineral development, and making land use decisions.

How was the data set created?

  1. From what previous works were the data drawn?
    2010-5090-N (source 1 of 17)
    Paul Denning, USGS, 20140701, Porphyry copper assessment of western Central Asia: Scientific Investigations Report 2010-5090-N.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Berger, B.R., Mars, J.C., Denning, P.D., Phillips, J.D., Hammarstrom, J.M., Zientek, M.L, Dicken, C.L., and Drew, L.J., with contributions from Alexeiev, D., Seltmann, R., and Herrington, R.J., 2014, Porphyry copper assessment of western Central Asia: U.S. Geological Survey Scientific Investigations Report 2010-5090-N, 219 p., 8 plates, and spatial data, http://dx.doi.org/10.3133/sir20105090N.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-L (source 2 of 17)
    Arthur Bookstrom, USGS, 20140515, Porphyry copper assessment of eastern Australia: Scientific Investigations Report 2010-5090-N.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Bookstrom, A.A., Glen, R.A., Hammarstrom, J.M., Robinson, G.R., Jr., Zientek, M.L., Drenth, B.J., Jaireth, Subhash, Cossette, P.M., and Wallis, J.C., 2014, Porphyry copper assessment of eastern Australia: U.S. Geological Survey Scientific Investigations Report 2010-5090-L, 160 p., and GIS data, available at http://dx.doi.org/10.3133/sir20105090L.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    Open-File Report 2008-1253 (source 3 of 17)
    Klaus Schulz, USGS, 20081001, Quantitative mineral resource assessment of copper, molybdenum, gold, and silver in undiscovered porphyry copper deposits in the Andes Mountains of South America: USGS Open-file Report 2008-1253.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Cunningham, C.G.; Zappettini, E.O.; Vivallo S., Waldo; Celada, C.M.; Quispe, Jorge; Singer, D.A.; Briskey, J.A.; Sutphin, D.M.; Gajardo M., Mariano; Diaz, Alejandro; Portigliati, Carlos; Berger, V.I., Carrasco, Rodrigo; and Schulz, K.J., 2008, Quantitative mineral resource assessment of copper, molybdenum, gold, and silver in undiscovered porphyry copper deposits in the Andes Mountains of South America: U.S. Geological Survey Open-File Report 2008-1253, 282 p., CD-ROM. (Also available at https://pubs.usgs.gov/of/2008/1253/.)

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-I (source 4 of 17)
    Floyd Gray, USGS, 20140228, Porphyry copper assessment of Central America and the Caribbean Basin: Scientific Investigations Report 2010-5090-I.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Gray, Floyd; Hammarstrom, J.M.; Ludington, Steve; Zürcher, Lukas; Nelson, C.E., Robinson, G.R., Jr., Miller, R.J., and Moring, B.C., 2014, Porphyry copper assessment of Central America and the Caribbean Basin: U.S. Geological Survey Scientific Investigations Report 2010-5090-I, 81 p. and GIS data, available at http://dx.doi.org/10.3133/sir20105090I.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-P (source 5 of 17)
    Jane M. Hammarstrom, USGS, Geologist, 20141104, Porphyry copper assessment of East and Southeast Asia: The Philippines, Taiwan (Republic of China), Republic of Korea (South Korea), and Japan: Scientific Investigations Series 2010-5090-P.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Hammarstrom, J.M., Bookstrom, A.A., DeMarr, M.W., Dicken, C.L., Ludington, Steve, Robinson, G.R., Jr., and Zientek, M.L., with contributions from Cox, D.P., Gerel, Ochir, Manipon, C.J.C., Rollan, L.A., Sakimoto, Takehiro, Singer, D.A., Takagi, Tetsuichi, and Watanabe, Yasushi, 2014, Porphyry copper assessment of East and Southeast Asia: The Philippines, Taiwan (Republic of China), Republic of Korea (South Korea), and Japan: U.S. Geological Survey Scientific Investigations Report 2010-5090-P, 241 p. and GIS data, available at http://dx.doi.org/10.3133/sir20105090P.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-D (source 6 of 17)
    Jane M. Hammarstrom, USGS, Geologist, 20130314, Porphyry copper assessment of Southeast Asia and Melanesia: Scientific Investigations Series 2010-5090-D.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Hammarstrom, J.M., Bookstrom, A.A., Dicken, C.L., Drenth, B.J., Ludington, Steve, Robinson, G.R., Jr., Setiabudi, B.T., Sukserm, Wudhikarn, Sunuhadi, D.N., Wah, A.Y.S., and Zientek, M.L., with contributions from Cox, D.P.; Jarnyaharn, Pairatt; Kopi, Gwaibo; Ngoc, N.T.M.; Otarawanna, Pichai; Pei, C.S.; Phany, Ung; Quy, N.V.; Sakimoto, Takehiro; Saroa, Dulcie; Soares de Costa, Norberta; Sotham, Sieng; Sim, I.M.; Trung, N.N.; Wongsomasak, Somob; Yokarti, Boonsong; and Zaw, Khin, 2013, Porphyry copper assessment of Southeast Asia and Melanesia: U.S. Geological Survey Scientific Investigations Report 2010-5090-D, 332 p. and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/d/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-A (source 7 of 17)
    Jane M. Hammarstrom, USGS, Geologist, 20100929, Porphyry copper assessment of Mexico: Scientific Investigations Series 2010-5090-A.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Hammarstrom, J.M.; Robinson, G.R., Jr.; Ludington, Steve; Gray, Floyd; Drenth, B.J.; Cendejas-Cruz, Francisco; Espinosa, Enrique; Pérez-Segura, Efrén; Valencia-Moreno, Martín; Rodríguez-Castañeda, J.L.; Vásquez-Mendoza, Rigoberto; and Zürcher, Lukas, 2010, Porphyry copper assessment of Mexico: U.S. Geological Survey Scientific Investigations Report 2010-5090-A, 176 p. and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/a/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    Open-File Report 2007-1005 (source 8 of 17)
    Stephen Ludington, USGS, Geologist, 20070101, Preliminary mineral resource assessment of selected mineral deposit types in Afghanistan: USGS Open-file Report 2007-1005.

    Online Links:

    Other_Citation_Details:
    Afghanistan tracts have been modified from published report by Jane Hammarstrom and Steve Ludington for inclusion in this Global report. Permissive rocks were extracted from geologic maps, and buffers created around rocks to create modified assessment tracts.
    Type_of_Source_Media: onLine
    Source_Contribution:
    Ludington, Steve, Orris, G.J., Bolm, K.S., Peters, S.G., and U.S. Geological Survey-Afghanistan Ministry of Mines and Industry Joint Mineral Resource Assessment Team, 2007, Preliminary mineral resource assessment of selected mineral deposit types in Afghanistan: U.S. Geological Survey Open-File Report 2007-1005, 44 p., available at https://pubs.usgs.gov/of/2007/1005/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-F (source 9 of 17)
    Stephen Ludington, USGS, Geologist, 20121022, Porphyry copper assessment of the Tibetan Plateau, China: Scientific Investigations Report 2010-5090-F.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Ludington, Steve, Hammarstrom, J.M., Robinson, G.R., Jr., Mars, J.C., and Miller, R.J., 2012, Porphyry copper assessment of the Tibetan Plateau, China: U.S. Geological Survey Scientific Investigations Report 2010-5090-F, 63 p. and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/f/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-G (source 10 of 17)
    Stephen Ludington, USGS, Geologist, 20121215, Porphyry copper assessment of the Mesozoic of East Asia: China, Vietnam, North Korea, Mongolia, and Russia: Scientific Investigations Report 2010-5090-G.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Ludington, Steve, Mihalasky, M.J., Hammarstrom, J.M., Robinson, G.R., Jr., Frost, T.P., Gans, K.D., Light, T.D., Miller, R.J., and Alexeiev, Dmitriy, 2012, Porphyry copper assessment of the Mesozoic of East Asia: China, Vietnam, North Korea, Mongolia, and Russia: U.S. Geological Survey Scientific Investigations Report 2010-5090-G, 53 p. and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/g/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-C (source 11 of 17)
    Mark J Mihalasky, USGS, 20111018, Porphyry copper assessment of British Columbia and Yukon Territory, Canada (version 1.1): Scientific Investigations Report 2010-5090-C.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Mihalasky, M.J., Bookstrom, A.A., Frost, T.P., and Ludington, Steve, with contributions from Logan, J.M., Panteleyev, Andre, and Abbot, Grant, 2011, revised 2013, Porphyry copper assessment of British Columbia and Yukon Territory, Canada (version 1.1): U.S. Geological Survey Scientific Investigations Report 2010-5090-C, 128 p., data tables and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/c/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-W (source 12 of 17)
    Mark J Mihalasky, USGS, 20150618, Porphyry copper assessment of northeast Asia: Far East Russia and northeasternmost China: Scientific Investigations Report 2010-5090-W.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Mihalasky, M.J., Ludington, Steve, Alexeiev, D.V., Frost, T.P., and Light, T.D., with contributions from Bookstrom, A.A., and Panteleyev, Andre, in press, Porphyry copper assessment of northeast Asia: Far East Russia and northeasternmost China: U.S. Geological Survey Scientific Investigations Report 2010-5090-W, 104 p. and GIS data, available at http://dx.doi.org/10.3133/sir20105090W.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-X (source 13 of 17)
    Mark J Mihalasky, USGS, 20150324, Porphyry Copper Assessment of the Central Asian Orogenic Belt and eastern Tethysides: China, Mongolia, Russia, Pakistan, Kazakhstan, Tajikistan, and India: Scientific Investigations Report 2010-5090-X.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Mihalasky, M.J., Ludington, Steve, Hammarstrom, J.M., Alexeiev, D.V., Frost, T.P., Light, T.D., Robinson, G.R., Jr., Briggs, D.A., Wallis, J.C., and Miller, R.J., with contributions from Bookstrom, A.A., Panteleyev, Andre, Chitalin, Andre, Seltmann, Reimar, Guangsheng, Y., Changyun, L., Jingwen, M., Jinyi, L., Keyan, X., Ruizhao, Q., Jianbao, S., Gangyi, S., and Yuliang, D., 2015, Porphyry Copper Assessment of the Central Asian Orogenic Belt and eastern Tethysides: China, Mongolia, Russia, Pakistan, Kazakhstan, Tajikistan, and India: U.S. Geological Survey Scientific Investigations Report 2010-5090-X, 106 p. and spatial data, http://dx.doi.org/10.3133/sir20105090X.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    Report of Investigation 208 (source 14 of 17)
    Kalevi Rasilaninen, Geological Survey of Finland, 20140101, Quantitative assessment of undiscovered resources in volcanogenic massive sulphide deposits, porphyry copper deposits and Outokumpu-type deposits in Finland: Report of Investigation 208.

    Online Links:

    Other_Citation_Details:
    Digital GIS files provided to USGS by email from Kalevi Rasilaninen on January 9, 2015.
    Type_of_Source_Media: onLine
    Source_Contribution:
    Rasilainen, K., Eilu, P., Halkoaho, T., Karvinen, A., Kontinen, A., Kousa, J., Lauri, L., Luukas, J., Niiranen, T., Nikander, J., Sipilä, P., Sorjonen-Ward, P., Tiainen, M., Törmänen, T. and Västi, K., 2014, Quantitative assessment of undiscovered resources in volcanogenic massive sulphide deposits, porphyry copper deposits and Outokumpu-type deposits in Finland: Geological Survey of Finland, Report of Investigation 208, 393 p., available at: http://tupa.gtk.fi/julkaisu/tutkimusraportti/tr_208.pdf.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-K (source 15 of 17)
    Jane M. Hammarstrom, USGS, Geologist, 20130702, Porphyry copper assessment of Europe, exclusive of the Fennoscandian Shield: Scientific Investigations Report 2090-5090-K.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Sutphin, D.M., Hammarstrom, J.M., Drew, L.J., Large, D.E., Berger, B.B., Dicken, C.L., and DeMarr, M.W. with contributions from Billa, Mario; Briskey, J.A.; Cassard, Daniel; Lips, Andor; Pertold, Zdenek Pertold, and Emilian Rosu, 2013, Porphyry copper assessment of Europe, exclusive of the Fennoscandian Shield: U.S. Geological Survey Scientific Investigations Report 2010-5090-K, 199 p. and GIS data, available at https://pubs.usgs.gov/sir/2010/5090/k/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    Open-File Report 02-198 (source 16 of 17)
    Stephen Ludington, USGS, Geologist, 20020102, Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States: USGS Open-file Report 02-198.

    Online Links:

    Other_Citation_Details:
    United States tracts have been modified from this report by Jane Hammarstrom and Steve Ludington for inclusion in this Global report. Permissive rocks were extracted from geologic maps, and buffers created around rocks to create modified assessment tracts.
    Type_of_Source_Media: onLine
    Source_Contribution:
    U.S. Geological Survey National Mineral Resource Assessment Team, 2002, Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 02-198, CD-ROM. Also available at https://pubs.usgs.gov/of/2002/of02-198/.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
    2010-5090-V (source 17 of 17)
    Lukas Zürcher, USGS, Porphyry copper assessment of the Tethys region of western and southern Asia: Scientific Investigations Report 2010-5090-V.

    Online Links:

    Type_of_Source_Media: onLine
    Source_Contribution:
    Zürcher, Lukas, Bookstrom, A.A., Hammarstrom, J.M., Mars, J.C., Ludington, Steve, Zientek, M.L., Dunlap, Pamela, and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M.,Berger, B.R., Herringon, R.J., Billa, Mario, Kuscu, Ilkay, Moon, C.J., and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010-5090-V, 232 p., and spatial data, available at http://dx.doi.org/10.3133/sir20105090V.

    Polygon tracts were used from source regeional report to compile single copper tract feature class (pCu_tracts).
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 1)
    Delineation of permissive tracts was carried out on a regional basis by different groups of scientific investigators; their results were published separately over a few years. For this compilation, those results were assembled and combined, merging polygons where it was appropriate to do so, and ensuring that attribute data were consistent (correction of spelling errors where identified, for example). Person who carried out this activity:
    Connie Dicken
    Midwest Region
    Geologist
    U.S. Geological Survey
    National Center Mail Stop 954
    12201 Sunrise Valley Dr
    Reston, VA
    USA

    703-648-6482 (voice)
    703-648-6252 (FAX)
    cdicken@usgs.gov
  3. What similar or related data should the user be aware of?
    , (Complete metadata record).

    Online Links:

    Other_Citation_Details: XML format
    Dicken, Connie L., Dunlap, Pamela, Parks, Heather L., Hammarstrom, Jane M., and Zientek, Michael L., 2016, Spatial database for a global assessment of undiscovered copper resources: Chapter Z in <em>Global mineral resource assessment</em>: Scientific Investigations Report 2010-5090, U.S. Geological Survey.

    Online Links:

    Other_Citation_Details: DOI: 10.3133/sir20105090Z

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    For the purpose of mineral resource assessment, deposits and prospects are included in the analysis if there is sufficient information available about them to determine that the deposit model is pertinent and that the information known about them can contribute usefully to the analysis. Consequently there may be in the literature or in other USGS databases reports of mineral resource occurrences that may appear to be pertinent to this study but were not included because those reports lack needed information.
  5. How consistent are the relationships among the observations, including topology?
    Tracts were checked to confirm deposits and prospects were inside tract boundaries.

    Table pcu_precambrian_deps_pros contains descriptions of Precambrian deposits only one of which was used in the assessment (in Finland). These data are included for completeness and for reference.

    Deposits and prospects that are geographically close to one another are considered by the assessment procedure to represent the same deposit, so their data are combined. This is how the porphyry copper deposits and prospects were separated into two tables, one containing individual deposit records (pcu_deps_pros) and the other containing aggregated reports describing groups of geographically close deposits that are combined for the assessment (pcu_groups).

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Peter N Schweitzer
    Midwest Region
    Geologist
    U.S. Geological Survey
    National Center Mail Stop 954
    12201 Sunrise Valley Dr
    Reston, VA
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@usgs.gov
  2. What's the catalog number I need to order this data set? sir20105090z
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Dec-2016
Metadata author:
Schweitzer, Peter, N
Eastern Mineral Resources Team
12201 Sunrise Valley Drive Mail Stop 954
Reston, VA
USA

703-648-6533 (voice)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/metadata/sir-2010-5090-z.faq.html>
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