Podiform chromite deposits

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Frequently anticipated questions:


What does this data set describe?

Title: Podiform chromite deposits
Abstract:
Location and characteristics of 1,124 individual mineral deposits of this type, with grade and tonnage models for chromium as well as several related elements.
  1. How might this data set be cited?
    Mosier, Dan L., Singer, Donald A., Moring, Barry C., and Galloway, John Paul, 2012, Podiform chromite deposits: Scientific Investigations Report 2012-5157, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -163.657778
    East_Bounding_Coordinate: 166.848333
    North_Bounding_Coordinate: 68.255278
    South_Bounding_Coordinate: -22.279167
  3. What does it look like?
    https://mrdata.usgs.gov/podchrome/sir-2012-5157.png (PNG)
    Simplified global map showing deposit locations, (540 x 270 pixels)
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2012
    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 Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (1054)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. 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?
    main
    Descriptive information about the deposit and its environs
    rec_id
    Record ID.

    Unique identifying number for the record, links to related rows in other tables. Integer of width 4.
    Range of values
    Minimum:1
    Maximum:1124
    depname
    Name of deposit.

    Name most recently used for the deposit. Textual values of no more than 60 characters.
    altname
    Other names.

    Alternative names that have been used for the deposit. Textual values of no more than 81 characters.
    ValueDefinition
    (no value)Information not available for this record. 786 records have no value for altname.
    includes
    Includes.

    Names of deposits that have been included in this description due to their proximity. Textual values of no more than 90 characters.
    ValueDefinition
    (no value)Information not available for this record. 1069 records have no value for includes.
    country
    Country.

    Country in which the deposit is located. Textual values of no more than 13 characters.
    cntrycd
    Country code.

    Short code indicating country and state or province containing the deposit. Textual values of no more than 4 characters.
    stprov
    State or province.

    Name of the state or province where the deposit is located. Textual values of no more than 34 characters.
    ValueDefinition
    (no value)Information not available for this record. 34 records have no value for stprov.
    latitude
    Latitude.

    Geographic latitude in decimal degrees, WGS84. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for latitude.
    Range of values
    Minimum:-22.2791666666667
    Maximum:68.2552777777778
    longitude
    Longitude.

    Geographic longitude in decimal degrees, WGS84. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for longitude.
    Range of values
    Minimum:-163.657777777778
    Maximum:166.848333333333
    latdeg
    Latitude degrees.

    Degrees of latitude. Integer of width 2.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for latdeg.
    Range of values
    Minimum:-22
    Maximum:68
    latmin
    Latitude minutes.

    Minutes of latitude. Integer of width 2.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for latmin.
    Range of values
    Minimum:-55
    Maximum:59
    latsec
    Latitude seconds.

    Seconds of latitude. Integer of width 2.
    ValueDefinition
    (no value)Information not available for this record. 80 records have no value for latsec.
    Range of values
    Minimum:-59
    Maximum:59
    londeg
    Longitude degrees.

    Degrees of longitude. Integer of width 3.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for londeg.
    Range of values
    Minimum:-163
    Maximum:166
    lonmin
    Longitude minutes.

    Minutes of longitude. Integer of width 2.
    ValueDefinition
    (no value)Information not available for this record. 79 records have no value for lonmin.
    Range of values
    Minimum:-59
    Maximum:59
    lonsec
    Longitude seconds.

    Seconds of longitude. Integer of width 2.
    ValueDefinition
    (no value)Information not available for this record. 80 records have no value for lonsec.
    Range of values
    Minimum:-59
    Maximum:59
    accuracy
    Location accuracy.

    General assessment of the location accuracy: Accurate if point location is based on a surface mine, tailings, or surface disturbance; Approximate if a general location given by description or from a large-scale map or where surface indications could not be seen; Uncertain if the location given is within an ultramafic body or geographic area where the deposit is known to be, but the exact location is not known, or may be an unverified mine, tailing pile, or surface disturbance; blank value indicates accurracy cannot be assessed. Textual values of no more than 11 characters.
    model
    Model type.

    Subtype of podiform chromite deposit as determined by the grade and tonnage models. Textual values of no more than 15 characters.
    tectset
    Paleotectonic setting.

    Paleotectonic setting, a preliminary categorization of the deposit according to the tectonic setting in which the deposit formed, midocean ridge, off-ridge, or suprasubduction. Textual values of no more than 15 characters.
    ValueDefinition
    (no value)Information not available for this record. 58 records have no value for tectset.
    ophzone
    Ophiolite zone.

    Stratigraphic position of the deposit within an ophiolite sequence: cumulate, transition, or tectonite. Textual values of no more than 10 characters.
    ValueDefinition
    (no value)Information not available for this record. 132 records have no value for ophzone.
    oreton
    Tonnage.

    Tonnage of ore, in millions of metric tons. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 209 records have no value for oreton.
    Range of values
    Minimum:1e-06
    Maximum:22.687
    crgrd
    Chromic oxide grade.

    Chromic oxide grade as percentage of the oxide in the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 209 records have no value for crgrd.
    Range of values
    Minimum:1.5
    Maximum:66
    rhgrd
    Rhodium grade.

    Rhodium grade as grams per metric ton of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 973 records have no value for rhgrd.
    Range of values
    Minimum:0
    Maximum:0.121
    irgrd
    Iridium grade.

    Iridium grade as grams per metric ton of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 975 records have no value for irgrd.
    Range of values
    Minimum:0
    Maximum:0.9
    rugrd
    Ruthenium grade.

    Ruthenium grde as grams per metric ton of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 974 records have no value for rugrd.
    Range of values
    Minimum:0
    Maximum:2.1
    pdgrd
    Palladium grade.

    Palladium grade as grams per metric ton of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 968 records have no value for pdgrd.
    Range of values
    Minimum:0
    Maximum:0.377
    ptgrd
    Platinum grade.

    Platinum grade as grams per metric ton of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 963 records have no value for ptgrd.
    Range of values
    Minimum:0
    Maximum:9.3
    crpct
    Cr.

    Chromium concentration as percentage of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 1074 records have no value for crpct.
    Range of values
    Minimum:0.6
    Maximum:46.7
    fepct
    Fe.

    Iron concentration as percentage of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 774 records have no value for fepct.
    Range of values
    Minimum:0.33
    Maximum:35
    crferatio
    Cr:Fe ratio.

    Ratio of the chromium concentration to iron concentration. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 826 records have no value for crferatio.
    Range of values
    Minimum:1
    Maximum:3.83
    alpct
    Alumina.

    Aluminum oxide concentration as percentage of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 955 records have no value for alpct.
    Range of values
    Minimum:1.2
    Maximum:32.6
    sipct
    Silica.

    Silica concentration as percentage of the deposit. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 929 records have no value for sipct.
    Range of values
    Minimum:0
    Maximum:45.94
    deptype
    Deposit type.

    Type of podiform chromite deposit. Textual values of no more than 24 characters.
    depform
    Deposit form.

    General form of the deposit as reported in the literature. Textual values of no more than 59 characters.
    ValueDefinition
    (no value)Information not available for this record. 251 records have no value for depform.
    deptext
    Deposit texture.

    Texture of the deposit as reported in the literature. Textual values of no more than 75 characters.
    ValueDefinition
    (no value)Information not available for this record. 337 records have no value for deptext.
    oretype
    Ore type.

    Type of ore present in the deposit: metallurgical, refractory, or chemical. Textual values of no more than 13 characters.
    depage
    Age of deposit.

    Geochronologic unit during which the deposit was formed. Textual values of no more than 119 characters.
    ValueDefinition
    (no value)Information not available for this record. 7 records have no value for depage.
    agemy
    Age (my).

    Age of the deposit in millions of years before the present, based on reported radiometric ages or the midpoints of geochronologic units. Integer of width 4.
    ValueDefinition
    (no value)Information not available for this record. 7 records have no value for agemy.
    Range of values
    Minimum:35
    Maximum:2700
    hostrock
    Host rocks.

    Lithologic terms describing the rocks that host the deposit. Textual values of no more than 43 characters.
    hostlen
    Host length.

    Length of the host rock body, in meters. Integer of width 6.
    ValueDefinition
    (no value)Information not available for this record. 109 records have no value for hostlen.
    Range of values
    Minimum:150
    Maximum:350000
    hostwid
    Host width.

    Width of the host rock body, in meters. Integer of width 6.
    ValueDefinition
    (no value)Information not available for this record. 109 records have no value for hostwid.
    Range of values
    Minimum:60
    Maximum:100000
    deparea
    Area of deposit.

    Area of the deposit in plan view, in square meters. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 612 records have no value for deparea.
    Range of values
    Minimum:0
    Maximum:300000
    ore_a
    A-axis of ore.

    Length of the major axis of the ellipse best representing the deposit in plan view, in meters. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 625 records have no value for ore_a.
    Range of values
    Minimum:0.91
    Maximum:1350
    ore_b
    B-axis of ore.

    Length of the minor axis of the ellipse best representing the deposit in plan view, in meters. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 650 records have no value for ore_b.
    Range of values
    Minimum:0.2
    Maximum:400
    minedepth
    Mine depth.

    Depth of the deepest part of workings, in meters below the ground surface. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 783 records have no value for minedepth.
    Range of values
    Minimum:0.61
    Maximum:450
    oredepth
    Depth to ore.

    Thickness of the covering material, in meters. Real numbers stored in double precision.
    Range of values
    Minimum:0
    Maximum:250
    anomaly
    Anomaly type.

    Type of geophysical anomaly at the deposit site. Textual values of no more than 60 characters.
    ValueDefinition
    (no value)Information not available for this record. 1116 records have no value for anomaly.
    anomaly_a
    A-axis of anomaly.

    Length of the major axis of the ellipse best representing the anomaly in plan view, in meters. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 1118 records have no value for anomaly_a.
    Range of values
    Minimum:48.8
    Maximum:1600
    anomaly_b
    B-axis of anomaly.

    Length of the minor axis of the ellipse best representing the anomaly in plan view, in meters. Real numbers stored in double precision.
    ValueDefinition
    (no value)Information not available for this record. 1118 records have no value for anomaly_b.
    Range of values
    Minimum:9.1
    Maximum:1200
    dep10km
    Deposit types within 10km.

    Types of mineral deposits found within 10km of the deposit, whether economic or not. Textual values of no more than 198 characters.
    ValueDefinition
    (no value)Information not available for this record. 12 records have no value for dep10km.
    discdate
    Discovery date.

    Date the deposit was discovered. Textual values of no more than 14 characters.
    ValueDefinition
    (no value)Information not available for this record. 622 records have no value for discdate.
    startdate
    Startup date.

    Date of first mining or production, if known. Textual values of no more than 12 characters.
    ValueDefinition
    (no value)Information not available for this record. 600 records have no value for startdate.
    comments
    Comments.

    Additional information about the site or commodities; may include supplementary information about incompletely explored deposits, undetermined tonnages and grades, as well as grades of additional elements, such as P, Ni, Au, Cu, Co, and others, when available. Textual values of no more than 254 characters.
    minerals
    Minerals reported at the site. May include generic names such as carbonates or pyroxene. Due to variation in the level of detail given in published reports, the lists of minerals for most of the deposits should not be regarded as complete
    rec_id
    Record ID.

    Unique identifying number for a site, a value of main:rec_id. Integer of width 4.
    Range of values
    Minimum:1
    Maximum:1124
    value
    Mineral name.

    Mineral name. Textual values of no more than 31 characters.
    rocks5km
    Rock types on a regional map found within 5km of the deposit
    rec_id
    Record ID.

    Unique identifying number for a site, a value of main:rec_id. Integer of width 4.
    Range of values
    Minimum:1
    Maximum:1124
    value
    Rock type.

    Rock type. Textual values of no more than 32 characters.
    ref
    Bibliographic references providing information about the deposit or commodity information
    rec_id
    Record ID.

    Unique identifying number for a site, a value of main:rec_id. Integer of width 4.
    Range of values
    Minimum:1
    Maximum:1124
    value
    Reference.

    Bibliographic reference, formatted as typically seen in a scientific publication. Textual values of no more than 254 characters.
    url
    Online linkage.

    URL for an online version of the report.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Mosier, Dan L.
    • Singer, Donald A.
    • Moring, Barry C.
    • Galloway, John Paul
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Peter N Schweitzer
    USGS ER GD
    Geologist
    12201 Sunrise Valley Drive
    Reston, VA
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@usgs.gov

Why was the data set created?

Provide factual support for the development of mineral deposit models that can be used in regional and national mineral resource assessments

It is not our intent to include every known deposit in the world. More importantly, for this study, the regions selected are considered well studied, with detailed deposit descriptions, maps and sections of ore bodies, and production or reserve data for most of the podiform chromite deposits

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?

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


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
    USGS ER GD
    Geologist
    12201 Sunrise Valley Drive
    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? USGS SIR 2012-5157
  3. What legal disclaimers am I supposed to read?
    Any trade names used in the data or report are for information only and do not imply an endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Mar-2018
Metadata author:
Peter N Schweitzer
USGS Eastern Mineral and Environmental Resources Science Center
Geologist
12201 Sunrise Valley Drive
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/metadata/sir-2012-5157.faq.html>
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