Mineral resource data for Mississippi Valley-Type and clastic-dominated sediment-hosted lead-zinc deposits

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Frequently anticipated questions:


What does this data set describe?

Title:
Mineral resource data for Mississippi Valley-Type and clastic-dominated sediment-hosted lead-zinc deposits
Abstract:
Summary information on Mississippi Valley-type and clastic dominated sediment-hosted lead-zinc deposits worldwide, with bibliographic references.
  1. How might this data set be cited?
    Taylor, Ryan D., Leach, David L., Bradley, Dwight C., and Pisarevsky, Sergei A., 2009, Mineral resource data for Mississippi Valley-Type and clastic-dominated sediment-hosted lead-zinc deposits: Open-File Report 2009-1297, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -163.21
    East_Bounding_Coordinate: 148.42
    North_Bounding_Coordinate: 83.08
    South_Bounding_Coordinate: -34.88
  3. What does it look like?
    https://mrdata.usgs.gov/catalog/images/OFR_2009-1297.png (PNG)
    Global distribution of these data from the web map interface, (768 x 384 pixels)
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2009
    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 (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 0.0001. Longitudes are given to the nearest 0.0001. 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
    General descriptive information about the deposit (Source: this dataset)
    rec_id
    Record ID.

    A distinct numerical identifier for the database record without further scientific significance, assigned by the data manager of mrdata.usgs.gov. Integer values. Int of width 4. (Source: this dataset)
    Range of values
    Minimum:1
    Maximum:240
    Resolution:1
    district
    District.

    Name of the mining district. Textual values of no more than 24 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 126 records have no value for district.
    depname
    Deposit.

    Most commonly used name of the deposit. Textual values of no more than 27 characters. (Source: this dataset) Textual values of no more than 27 characters.
    country
    Country.

    Country in which the deposit is located. Textual values of no more than 26 characters. (Source: this dataset) Textual values of no more than 26 characters.
    latitude
    Latitude.

    Geographic latitude of the deposit, in decimal degrees WGS84, south latitude negative. Real numbers stored in double precision. (Source: this dataset)
    Range of values
    Minimum:-34.88
    Maximum:83.08
    Units:decimal degrees
    longitude
    Longitude.

    Geographic longitude of the deposit, in decimal degrees WGS84, west longitude negative. Real numbers stored in double precision. (Source: this dataset)
    Range of values
    Minimum:-163.21
    Maximum:148.42
    Units:decimal degrees
    deptype
    Classification.

    General classification of the deposit as MVT (Mississippi Valley Type), CD (clastic-dominated), or UN (unclassified). Textual values of no more than 3 characters. (Source: this dataset)
    ValueDefinition
    MVTMississippi Valley Type deposit
    CDClastic-dominated deposit
    UNunclassified deposit
    alttype
    Alternative Classification.

    Any alternative classification commonly given for the deposit, includes BHT (Broken Hill type), carbonate-hosted/replacement, or sh (shale) or cc (coarse clastic). Textual values of no more than 23 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 230 records have no value for alttype.
    tectset
    Tectonic Setting.

    Generalized tectonic setting: PM (passive margin), BA (back arc basin), CS (continental sag), RF (rift), or UN (unclassified). Textual values of no more than 2 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 128 records have no value for tectset.
    hostrock
    Host Rocks.

    Lithology of the host rock. Textual values of no more than 89 characters. (Source: this dataset) Textual values of no more than 89 characters.
    oreton
    Size (tonnage).

    Deposit size given in million metric tons of ore. Real numbers stored in double precision. (Source: this dataset)
    Range of values
    Minimum:0.01
    Maximum:394
    Units:million metric tons
    pbton
    Pb (tonnage).

    Tonnage of lead. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for pbton.
    Range of values
    Minimum:0
    Maximum:28
    Units:million metric tons
    znton
    Zn (tonnage).

    Tonnage of zinc. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 10 records have no value for znton.
    Range of values
    Minimum:0
    Maximum:27.39
    Units:million metric tons
    pbznton
    Pb+Zn (tonnage).

    Tonnage of lead and zinc combined. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 1 records have no value for pbznton.
    Range of values
    Minimum:0.002096
    Maximum:51.8
    Units:million metric tons
    pbgrd
    Pb grade.

    Lead grade. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 28 records have no value for pbgrd.
    Range of values
    Minimum:0.18
    Maximum:13
    Units:percent of metal in
    zngrd
    Zn grade.

    Zinc grade. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 11 records have no value for zngrd.
    Range of values
    Minimum:0.11
    Maximum:24
    Units:percent of metal in
    pbzngrd
    (Pb+Zn) grade.

    Combined grade of lead and zinc. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 1 records have no value for pbzngrd.
    Range of values
    Minimum:0.43
    Maximum:26.1
    Units:percent of metal in
    cugrd
    Cu grade.

    Copper grade. Real numbers stored in double precision. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 211 records have no value for cugrd.
    Range of values
    Minimum:0.09
    Maximum:4.39
    Units:percent of metal in
    aggrd
    Ag grade.

    Silver grade. Textual values of no more than 5 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 135 records have no value for aggrd.
    othercom
    Other Commodities.

    Other commodities present at the site. Textual values of no more than 17 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 231 records have no value for othercom.
    refgen
    General References.

    Short citations for general references. Textual values of no more than 169 characters. (Source: this dataset) Textual values of no more than 169 characters.
    refprod
    Production or Reserves References.

    Short citations for references related to production and reserves. Textual values of no more than 64 characters. (Source: this dataset) Textual values of no more than 64 characters.
    hostage
    Host-Rock Age.

    Age of the host rocks. Textual values of no more than 31 characters. (Source: this dataset) Textual values of no more than 31 characters.
    minagemeth
    Mineralization Age and Method.

    Mineralization ages, with the method of determining age in parentheses after each estimate. Textual values of no more than 84 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 177 records have no value for minagemeth.
    refage
    Age Reference.

    Short citations for references documenting the geologic age of the deposit. Textual values of no more than 79 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 177 records have no value for refage.
    deptypea
    Deposit type A.

    Classification of the deposit as given in Leach and others (2005). Textual values of no more than 5 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 7 records have no value for deptypea.
    deptypeb
    Deposit type B.

    Classification of the deposit as given in Leach and others (2005). Textual values of no more than 12 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 95 records have no value for deptypeb.
    deptypec
    Deposit type C.

    Classification of the deposit as given in Leach and others (2005). Textual values of no more than 12 characters. (Source: this dataset)
    ValueDefinition
    (no value)Information not available for this record. 206 records have no value for deptypec.
    reference
    References categorized by topic (Source: this dataset)
    rec_id
    Record ID.

    Numerical identifier for the deposit, matches a value in main:rec_id. Integer values. Int of width 4. (Source: this dataset)
    Range of values
    Minimum:1
    Maximum:240
    Resolution:1
    field
    Category.

    Category to which the reference applies, one of "general", "production", or "age". Textual values of no more than 10 characters. (Source: this dataset) Textual values of no more than 10 characters.
    reference
    Bibliographic reference.

    Bibliographic reference drawn from the printed report. Textual values of no more than 480 characters. (Source: this dataset) Textual values of no more than 480 characters.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Taylor, Ryan D.
    • Leach, David L.
    • Bradley, Dwight C.
    • Pisarevsky, Sergei A.
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    David L Leach
    USGS CR RM GD
    Scientist Emeritus
    Box 25046$Denver Federal Center$Mail Stop 973
    Denver, CO
    USA

    303-236-5522 (voice)
    303-236-3200 (FAX)
    dleach@usgs.gov

Why was the data set created?

These mineral deposit resource data are important for exploration targeting and mineral resource assessments. There is significant variability in the resource data for these deposit types, and ore controls vary from one region to another.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2010 (process 1 of 1)
    Published information in the report was rearranged and formatted as digital geospatial data for use in map interfaces and web search interfaces. The attribute information for individual deposits was drawn from table A1, and the references were drawn from the text of the report. Person who carried out this activity:
    Peter N Schweitzer
    USGS Geology, Energy, and Minerals Science Center
    Geologist
    Mail Stop 954
    12201 Sunrise Valley Dr
    Reston, VA
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@usgs.gov
    Data sources used in this process:
    • USGS OFR 2009-1297
    Data sources produced in this process:
  3. What similar or related data should the user be aware of?
    Singer, Donald A., Berger, Vladimir I., and Moring, Barry C., 2009, Sediment-hosted zinc-lead deposits of the world: Open-File Report 2009-1252, Geological Survey (U.S.), Menlo Park, California.

    Online Links:


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?
    In this report, we do not include sandstone-Pb, sandstone-hosted Pb, or Pb-Zn vein districts such as those in Freiberg, Germany, or Coeur d’Alene, Idaho, because these deposits probably represent different deposit types. We do not include fracture-controlled deposits in which fluorite is dominant and barite typically abundant (for example, Central Kentucky; Hansonburg, N. Mex.) or the stratabound fluorite-rich, but also lead- and zinc-bearing deposits, such as those in southern Illinois, which are considered a genetic variant of carbonate-hosted Pb-Zn deposits. Many of the deposits do not have absolute mineralization ages listed, because of the difficulty of directly dating the ore minerals. Some deposits and districts are not presented in the compilation (for example, Central Missouri and Northern Arkansas districts, U.S.A.), because publicly accessible resource information was not available for a variety of reasons.
  5. How consistent are the relationships among the observations, including topology?
    In some cases, mineral resource data were available only for total district resources, but not for individual mines within the district. For these districts, the resource data are presented in appendix table A2 of the report. There is significant variability in the resource data for these deposit types, and ore controls vary from one region to another. Therefore, grade-tonnage estimations are best evaluated as subsets of the data in appendix table A1 where local mineralization styles and ore controls characterize the region being evaluated for grade-tonnage relations. Furthermore, consideration should also be given to the tendency for MVT resources to occur in large mineralized regions.

    Criteria used to classify the deposits and districts as MVT versus CD in appendixes A and B were based on the classifications assigned to the deposits in the literature and the opinions of the authors that relied on personal observations of the deposits or, in many cases, on descriptions of the geological setting and lithology of the ore-hosting sedimentary rock sequences. Six deposits are included in appendix A as “Unclassified” because the descriptions of the tectonic setting and host rock sequences were insufficient to allow confident discrimination between the two major types of Pb-Zn deposits.

    The resource information for the deposits is limited to publicly accessible resource information from sources cited in appendix tables A1 and A2. Some deposits and districts are not presented in the compilation (for example, Central Missouri and Northern Arkansas districts, U.S.A.), because publicly accessible resource information was not available for a variety of reasons. It should be noted that many factors (for example, metal prices, location, corporate policies, national politics, and so forth) influence the determination of the resource data in appendix tables A1 and A2. Furthermore, publicly available data (on which table A1 is based) are not necessarily the most recent. Therefore, the data in table A1, although considered to be the best currently available, do not necessarily reflect the true nature of mineralization in the ground.

    Care must be taken with the usage of this data compilation because there are limitations to the data. Some resource data are old and have not been recently updated. Different deposits listed will be characterized by different metal cut-off grades in their definition of ore tonnages. Some deposits are still in the exploration phase and in the future are likely to have more accurate mineral resource estimates.

    Many of the deposits do not have absolute mineralization ages listed, because of the difficulty of directly dating the ore minerals. Numerous papers have been published presenting dates of ore deposition, and careful consideration went into determining if the methods shown accurately reflect the age of ore formation, or something else. Dates deemed unreliable by the authors of this report have been excluded from this data compilation. Some deposits also have ambiguous or conflicting classifications reported in the literature. Caution was exercised in determining the correct deposit-type classification. Because this is a global compilation, aspects such as location, metal prices at the time of resource estimation, and regional politics all play roles in the resource estimates. Lastly, reporting of resource estimates is not as strictly controlled in some countries relative to others; therefore, overestimation of metal tonnages may characterize some deposits hosted in certain countries.

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 Geology, Energy, and Minerals Science Center
    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 Open-File Report 2009-1297
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 21-Jan-2021
Metadata author:
Peter N Schweitzer
USGS Geology, Energy, and Minerals 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/ofr-2009-1297.faq.html>
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