National Mineral Resource Assessment 1998

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Frequently anticipated questions:


What does this data set describe?

Title: National Mineral Resource Assessment 1998
Abstract:
Estimates of the tonnages and amounts of contained metal in undiscovered deposits, mineral deposit types.
  1. How might this data set be cited?
    U.S. Geological Survey, 2001, National Mineral Resource Assessment 1998: Circular 1178, U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -179.14303704601
    East_Bounding_Coordinate: -67.41278527303
    North_Bounding_Coordinate: 71.3963032638234
    South_Bounding_Coordinate: 28.9786952850653
  3. What does it look like?
    https://mrdata.usgs.gov/nmra/nmra-example.png (PNG)
    Reduced-size image of map interface showing permissive tracts for Hot spring Au deposits, (673 x 364 pixels)
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1996
    Currentness_Reference:
    Publication date of the original report; subsequent reports elaborated and expanded on these results
  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):
      • G-polygon (5769)
    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?
    tract
    Estimates of the number of undiscovered deposits in each tract
    tract
    Coded identifier grouping polygons assessed for the same type of deposit in a given geographic region Short texts combining a region abbreviation with a sequence number, purely to differentiate the tract from other tracts, without additional scientific significance.
    layer
    Coded identifier abbreviating the deposit type Short codes (4 or 5 letters and numbers) used to abbreviate the deposit types
    dep_type
    Type of mineral deposit for which the number of undiscovered deposits in the tract was estimated Plain texts naming the deposit model used for the assessment; approximately matching the model title used in the published source (indicated by the dep_model field)
    dep_model
    Coded identifier used in Cox and Singer (1986) and related references to refer to the deposit type Coded identifiers indicating the model used for the assessment; most refer to Cox and Singer (1986), some indicate two models using + as a conjunction, a few indicate other USGS publications
    mark3_id
    Coded identifier for the deposit type used by the MARK3 mineral assessment software
    Formal codeset
    Codeset Name:MARK3 model identifiers
    Codeset Source:https://pubs.usgs.gov/of/1998/0356/report.pdf
    age
    General chronostratigraphic age in which mineralization is anticipated to have occurred Geologic time periods or ranges expressed as the names of chronostratigraphic units.
    region
    General geographic region in which the tract is located Names indicating generalized geographic regions which are described more precisely in USGS Circular 1178
    state
    States in which the tract is primarily located (space-separated list of values)
    Formal codeset
    Codeset Name:2-letter postal abbreviations for US states
    Codeset Source:USPS
    p_90
    Estimated number of undiscovered deposits in the tract, with 90% confidence
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:0
    Maximum:80
    Units:deposits
    p_50
    Estimated number of undiscovered deposits in the tract, with 50% confidence
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:0
    Maximum:600
    Units:deposits
    p_10
    Estimated number of undiscovered deposits in the tract, with 10% confidence
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:0
    Maximum:800
    Units:deposits
    p_05
    0 Estimated number of undiscovered deposits in the tract, with 5% confidence
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:0
    Maximum:800
    Units:deposits
    p_01
    Estimated number of undiscovered deposits in the tract, with 1% confidence
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:1
    Maximum:800
    Units:deposits
    p_0
    Estimated probability that there are no undiscovered deposits of the specified type in this tract
    ValueDefinition
    naNo quantitative assessment of the tract was made.
    Range of values
    Minimum:0.15
    Maximum:0.99
    Units:probability in percent
    estimators
    Names of the scientists who provided the estimates of undiscovered deposits Last names of members of the assessment team, in comma-separated lists. Some names include a first initial to clarify the identity of the estimator.
    area_km2
    Total area of the tract, in square kilometers
    Range of values
    Minimum:29
    Maximum:702400
    Units:square kilometers

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Peter N Schweitzer
    MIDWEST REGION
    Geologist
    Mail Stop 954
    12201 Sunrise Valley Dr
    Reston, VA
    USA

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

Why was the data set created?

As the Nations population grows and its economy matures, greater attention is being paid to such issues as land use and environmental quality, as well as to sustainability of mineral supplies to provide for the needs of future generations. National Mineral Resource Assessments provide a framework for addressing these issues by monitoring the continuing depletion of the Nations nonrenewable mineral wealth and by contributing information required to manage resource extraction while minimizing consequent environmental effects. For responsible stewardship of the Nations lands and resources, it is important to know in which areas future mineral resources may be located and how much metal such resources might contain (McCammon and Briskey, 1992).

How was the data set created?

  1. From what previous works were the data drawn?
    cir1178 (source 1 of 3)
    The U.S. Geological Survey National Mineral Resource Assessment Team, 2000, 1998 Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States: Circular 1178, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Type_of_Source_Media: digital files
    Source_Contribution:
    Permissive tracts for the conterminous US with assessment information
    ofr2002198 (source 2 of 3)
    U.S. Geological Survey National Mineral Resource Assessment Team, and Schruben, Paul G. (compiler), 2002, Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States: A Portable Document (PDF) Recompilation of USGS Open-File Report 96-96 and Circular 1178: Open-File Report 2002-198, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Type_of_Source_Media: digital files
    Source_Contribution: Permissive tracts for Alaska with assessment information
    ofr9696 (source 3 of 3)
    Ludington, S. D., Cox, D. P., and McCammon, R. B., 1996, Data Base for a National Mineral-Resource Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the Conterminous United States: Open-File Report 96-96, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Type_of_Source_Media: digital files
    Source_Contribution: Original report used for comparison
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 1)
    Permissive tracts were drawn from the previously published reports and entered into PostgreSQL relational database with PostGIS used to express the geometry. Additional web interfaces were developed to make it easier for people outside USGS to find, get, and use these data.
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    These data are not observational but are interpretations made by the original authors, so accuracy must be judged by evaluating the source publications.

    For consistency and simplicity, some attribute values were shortened; where the original indicated that no quantitative assessment was carried out for a tract, the values in this database are simply "NA".
  2. How accurate are the geographic locations?
    While these tracts are defined somewhat arbitrarily, their boundaries should be understood as broad approximations of the areas intended for assessment by the authors. In some cases it seems clear that the geometries digitized were much more precise than the assessors actually intended, so users should not assume any point close to a boundary has or does not have characteristics of the nearby polygon.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Hawaii was not assessed. In addition a number of tracts indicate that no quantitative assessment was made, even though the rationale information will indicate some of the thinking that went into the decision not to produce a quantitative estimate for those tracts.
  5. How consistent are the relationships among the observations, including topology?
    Assessed permissive tracts in Alaska were handled separately from those in the conterminous US even though in many cases the deposit models considered would have been the same. However users should assume that the concept envisioned in the deposit models for Alaskan tracts might differ in particulars from the concept used in the conterminous US.

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)
    Schweitzer, Peter, N
    Eastern Mineral Resources Team
    12201 Sunrise Valley Drive Mail Stop 954
    Reston, VA
    USA

    703-648-6533 (voice)
    pschweitzer@usgs.gov
  2. What's the catalog number I need to order this data set? Circular 1178 with data from OFR 02-198
  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?
    • Availability in digital form:
      Data format: Permissive tracts for deposit types containing copper, silver, gold, lead, and zinc with estimates of the number of undiscovered deposits in each tract. in format WMS (version 1.1,1)
      Network links: https://mrdata.usgs.gov/services/nmra?request=GetCapabilities&service=WMS&version=1.3.0
      Data format: Permissive tracts for mineral deposits containing copper, gold, silver, lead, and zinc in the continental US and Alaska, by deposit type with estimates of the number of undiscovered deposits of each type. in format Shapefile (version 1.0) Size: 7.1
      Network links: https://mrdata.usgs.gov/nmra/nmra.zip
      Data format: Permissive tracts for mineral deposits containing copper, gold, silver, lead, and zinc in the continental US and Alaska, by deposit type with estimates of the number of undiscovered deposits of each type. in format KML (version 2.2) Size: 5.5
      Network links: https://mrdata.usgs.gov/nmra/nmra-kml.zip
    • Cost to order the data: none


Who wrote the metadata?

Dates:
Last modified: 11-Jan-2017
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/nmra.faq.html>
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