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Alaska Resource Data File (ARDF)

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title: Alaska Resource Data File (ARDF)
Abstract:
Database of descriptions of mines, prospects, and mineral occurrences in Alaska.
  1. How should this data set be cited?

    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 172
    East_Bounding_Coordinate: -130
    North_Bounding_Coordinate: 72
    South_Bounding_Coordinate: 52.0

  3. What does it look like?

    http://mrdata.usgs.gov/ardf/ardf.png (PNG)
    Distribution of ARDF records in Alaska (geographic image, no projection). 1280x1024 pixels, 1.1 megabytes.

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1988
    Ending_Date: Present
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: database

  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.

    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 0.01. Longitudes are given to the nearest 0.01. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

  7. How does the data set describe geographic features?

    ardf.dbf
    Descriptions of mines, prospects, and mineral occurrences in Alaska. (Source: USGS)

    site
    Site names.

    The name or names of the mine, prospect or mineral occurrence as it is referred to in the literature. If more than one name has been used, the primary name is the one in most common usage and is listed first. Textual values of no more than 314 characters.

    district
    District.

    Name of the general area in which the site is located. Textual values of no more than 33 characters.

    ValueDefinition
    (no value)Information not available for this record. 14 records have no value for district.

    comm_main
    Main commodities.

    Dominant elements or commodities of real or potential economic value in the site. For some deposits, the list of commodities is only a list of elements identified in a sample or samples and does not necessarily indicate the commodities that ultimately will prove valuable. Textual values of no more than 86 characters.

    ValueDefinition
    (no value)Information not available for this record. 42 records have no value for comm_main.

    quad_250
    Quadrangle map, 1:250,000-scale.

    USGS topographic maps on which the site is located. The first two letters are a code for the 1:250,000-scale quadrangle. Textual values of no more than 8 characters.

    ValueDefinition
    (no value)Information not available for this record. 1 records have no value for quad_250.
    ACArctic
    ADAdak
    AFAfognak
    AKAtka
    ALAtlin
    AMAmukta
    ANAnchorage
    ARAmbler River
    ATAttu
    BABarter Island
    BBBristol Bay
    BCBradfield Canal
    BDBig Delta
    BGBering Glacier
    BHBethel
    BIBaird Inlet
    BLBlack
    BMBaird Mountains
    BNBendeleben
    BPBeechey Point
    BRBlack River
    BSBlying Sound
    BTBettles
    BVBeaver
    BWBarrow
    CACandle
    CBCold Bay
    CGChignik
    CHChandalar
    CICircle
    CLChandler Lake
    CMCape Mendenhall
    COColeen
    CRCraig
    CSChristian
    CVCordova
    CYCharley River
    DEDixon Entrance
    DIDillingham
    DLDe Long Mountains
    DPDemarcation Point
    EAEagle
    FBFairbanks
    FIFlaxman Island
    FPFalse Pass
    FYFort Yukon
    GIGareloi Island
    GOGoodnews
    GUGulkana
    HCHoly Cross
    HEHealy
    HGHagemeister Island
    HPHooper Bay
    HRHarrison Bay
    HUHughes
    HWHoward Pass
    IBIcy Bay
    IDIditarod
    IKIkpikpuk River
    ILIliamna
    JUJuneau
    KBKuskokwim Bay
    KCKetchikan
    KDKodiak
    KGKaguyak
    KHKantishna River
    KKKiska
    KLKillik River
    KNKenai
    KRKarluk
    KTKateel River
    KWKwiguk
    KZKotzebue
    LCLake Clark
    LGLivengood
    LHLime Hills
    LRLookout Ridge
    MAMarshall
    MCMcCarthy
    MDMedfra
    MFMount Fairweather
    MGMcGrath
    MHMount Hayes
    MIMiddleton Island
    MKMount Katmai
    MLMount Michelson
    MMMount McKinley
    MRMeade River
    MSMount St. Elias
    MUMisheguk Mountain
    MZMelozitna
    NBNabesna
    NGNushagak Bay
    NINunivak Island
    NKNaknek
    NLNulato
    NMNome
    NRNorton Bay
    NTNoatak
    OFOffshore
    OPOphir
    PAPort Alexander
    PEPetersburg
    PHPoint Hope
    PIPribilof Islands
    PLPoint Lay
    PMPort Moller
    PRPrince Rupert
    PSPhilip Smith Mts.
    RBRuby
    RIRat Islands
    RMRussian Mission
    SASamalga Island
    SBStepovak Bay
    SCSaint Michael
    SDSumdum
    SESelawik
    SFShishmaref
    SGSagavanirktok
    SHShugnak
    SISitka
    SKSkagway
    SLSaint Lawrence
    SMSleetmute
    SNSimeonof Island
    SOSolomon
    SPSurvey Pass
    SRSeward
    STSaint Matthew
    SUSeguam
    SVSeldovia
    SWSutwik Island
    TATaylor Mountains
    TBTable Mountain
    TCTanacross
    TETeller
    TITrinity Island
    TKTalkeetna Mountains
    TLTalkeetna
    TNTanana
    TRTaku River
    TSTeshekpuk
    TYTyonek
    UGUgashik
    UKUmnak
    ULUnalakleet
    UMUnimak
    UNUnalaska
    URUtukok River
    UTUmiat
    VAValdez
    WAWainwright
    WIWiseman
    YAYakutat

    quad_63360
    Quadrangle map, 1:63,360-scale.

    USGS topographic maps on which the site is located. Maps are identified in two parts, a two-letter code for the 1:250,000-scale quadrangle followed by the letter, hyphen, and number(s) used to designate the 1:63,360-scale map sheet. following USGS. Textual values of no more than 13 characters.

    ValueDefinition
    (no value)Information not available for this record. 77 records have no value for quad_63360.

    latitude
    Latitude.

    Location of the site in decimal degrees. Some sites cover large areas and the location given is a point at the approximate center of the area. Real numbers stored in double precision.

    Range of values
    Minimum:51.6
    Maximum:69.63

    longitude
    Geographic longitude.

    Location of the site in decimal degrees. Some sites cover large areas and the location given is a point at the approximate center of the area. Real numbers stored in double precision.

    Range of values
    Minimum:-178.8
    Maximum:-130.016

    location
    Location and accuracy.

    A narrative description of the location of the site and its areal extent, which should also include information on the reliability of the location. Textual values of no more than 1418 characters.

    comm_other
    Other commodities.

    Other commodities present in minor amounts as determined by analysis or mineralogical determination. For some deposits, the list of commodities is only a list of elements identified in a sample or samples and does not necessarily indicate the commodities. Textual values of no more than 48 characters.

    ValueDefinition
    (no value)Information not available for this record. 3842 records have no value for comm_other.

    ore
    Ore minerals.

    A list of the minerals in the site, usually metallic, which are of potential economic value. Textual values of no more than 368 characters.

    ValueDefinition
    (no value)Information not available for this record. 726 records have no value for ore.

    gangue
    Gangue minerals.

    A list of the non-economic minerals in the site that cannot be avoided in mining but are separated during concentration. Textual values of no more than 220 characters.

    ValueDefinition
    (no value)Information not available for this record. 3530 records have no value for gangue.

    site_type
    Site type.

    The sites described in this database are separated into mines, prospects, and mineral occurrences. In general, mines have past production, prospects have had some development work, and mineral occurrences include unexplored or incompletely explored oc. Textual values of no more than 17 characters.

    ValueDefinition
    (no value)Information not available for this record. 5 records have no value for site_type.

    status
    Site status.

    Inactive or active. An active designation indicates recent work at the time of record entry or update. The determination of this status is not to be construed to reflect the legal status of the site, but rather indicates the appearance of exploration. Textual values of no more than 26 characters.

    ValueDefinition
    (no value)Information not available for this record. 66 records have no value for status.

    production
    Indication of production.

    Restricted to "yes", "no", or undetermined ("undet."). "Yes" may be qualified as small, medium, or large. Textual values of no more than 16 characters.

    ValueDefinition
    (no value)Information not available for this record. 87 records have no value for production.

    dep_model
    Mineral deposit model.

    One or more named descriptive or genetic mineral deposit models listed in Cox and Singer (1986), Bliss (1992), or other indicated references. The models shown are those that appeared most appropriate to the compilers of the site record. Textual values of no more than 617 characters.

    ValueDefinition
    (no value)Information not available for this record. 812 records have no value for dep_model.

    geol_desc
    Geologic description.

    Local geology and character of the deposit including, where possible, the host rock, structure of the host and mineralized system, mineralogical relations, and the shape and form of the deposit. Textual values of no more than 8693 characters.

    ValueDefinition
    (no value)Information not available for this record. 3 records have no value for geol_desc.

    work_expl
    Workings or exploration.

    A description of the mining or exploration efforts to evaluate a mine or prospect. For mineral occurrences, this field would normally include the work done or the evidence to suggest mineral potential. Textual values of no more than 6459 characters.

    ValueDefinition
    (no value)Information not available for this record. 679 records have no value for work_expl.

    comments
    Additional comments.

    Pertinent information not appropriate for other fields in the description. Textual values of no more than 1660 characters.

    ValueDefinition
    (no value)Information not available for this record. 4319 records have no value for comments.

    reference
    References.

    List of known references that discuss the occurrence or are applicable to its description. Textual values of no more than 1372 characters.

    ValueDefinition
    (no value)Information not available for this record. 14 records have no value for reference.

    ARDF_num
    ARDF Number.

    Unique label assigned to each site. First two letters comprise the quadrangle code, followed by a three digit number. Textual values of no more than 11 characters.

    rept_names
    Reporters.

    Names of people responsible for completion of the record. Textual values of no more than 134 characters.

    rept_date
    Last report date.

    Date of record entry or last update. Textual values of no more than 16 characters.

    ValueDefinition
    (no value)Information not available for this record. 3 records have no value for rept_date.

    MRDS_num
    MRDS Number.

    Unique identifier for the record as it appeared in the Mineral Resources Data System (MRDS). Textual values of no more than 61 characters.

    ValueDefinition
    (no value)Information not available for this record. 3183 records have no value for MRDS_num.

    age
    Age of mineralization.

    The age of mineralization and an explanation of the evidence for the age, if warranted. Textual values of no more than 1323 characters.

    ValueDefinition
    (no value)Information not available for this record. 1546 records have no value for age.

    rept_aff
    Reporter affiliation.

    Institutional affiliation of the reporter providing the information about the site. Textual values of no more than 53 characters.

    ValueDefinition
    (no value)Information not available for this record. 5197 records have no value for rept_aff.

    model_code
    Mineral deposit model number.

    Unique identifier for the mineral deposit model, from Cox and Singer (1986) or Bliss (1992). Textual values of no more than 68 characters.

    ValueDefinition
    (no value)Information not available for this record. 2071 records have no value for model_code.

    alteration
    Alteration of deposit.

    Description of alteration of the deposit. Textual values of no more than 1594 characters.

    ValueDefinition
    (no value)Information not available for this record. 4254 records have no value for alteration.

    prod_notes
    Production notes.

    More extensive (and variable) information about production at the site, if known. Textual values of no more than 3488 characters.

    ValueDefinition
    (no value)Information not available for this record. 5435 records have no value for prod_notes.

    reserves
    Reserve estimates.

    Reserve figures and references to their source. This field may include estimates based on a variety of assumptions at various times; this can result in conflicting assessments of reserves. This field may also include resource estimates based on probab. Textual values of no more than 1661 characters.

    ValueDefinition
    (no value)Information not available for this record. 5990 records have no value for reserves.

    prime_ref
    Primary reference.

    The best reference describing the occurrence, although it may be far from a complete description. Textual values of no more than 193 characters.

    ValueDefinition
    (no value)Information not available for this record. 42 records have no value for prime_ref.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    U.S. Geological Survey Mineral Resources Program, Western Region - Alaska Section
    Attn: Frederic H. Wilson
    Geologist
    4200 University Drive
    Anchorage, AK
    USA

    907-786-7448 (voice)
    fwilson@usgs.gov


Why was the data set created?

The Alaska Resource Data File (ARDF) is a subset of the National Mineral Resource Data System (MRDS) that has been specifically re-formatted and re-designed to better meet the needs of the local user community.


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: 2005 (process 1 of 2)
    The original ARDF records came from the national database MRDS. The ARDF records are being updated from information of government, industry, and literature sources. The updated ARDF records are fed back to the national MRDS database. Downloaded Filemaker Pro database file (ARDFcomp.fp5) on 05/04/2005 from ARDF website: http://ardf.wr.usgs.gov/digital.html. Imported ARDFcomp.fp5 into Filemaker Pro 6.0 and exported all records as a DBF file. Left out the following 5 fields because field length record exceeded 255 characters: Location, Geologic Description, Workings/exploration, Additional Comments, References. Imported DBF file into ArcView 3.2 and created shapefile: ardf05042005b.shp

    Date: 2008 (process 2 of 2)
    Downloaded ardfcomp.CSV from http://ardf.wr.usgs.gov/ Removed a few duplicate rows in this file. Converted for use in Mineral Resources On-Line Spatial Data web site. Modified nonprintable characters 0x82 to eacute (0xe9), removed nonprintable characters 0x0B, removed excess spaces and tab characters.

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

    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?

    The location of a site is given in decimal degrees. Some sites are areas rather than points and the geographic coordinates are the approximate center of the area. The precision of the latitude and longitude is reflected in the number of decimal places given. A narrative description of the location and the precision of the location is given in the text field 'Location description and accuracy'.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    ARDF is mainly concerned with the metallic commodities. Common industrial minerals such as sand and gravel, crushed stone, and limestone are not included, nor are energy minerals such as peat, coal, and oil and gas. Uranium and thorium, and rare earth elements are included, as well as high unit-value industrial minerals as barite, jade, graphite, and gypsum.

  5. How consistent are the relationships among the observations, including topology?

    A site is a single geographic location, point or area, which may have had multiple site names. For historical perspective, all proper names are listed.


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)

    U.S. Geological Survey Mineral Resources Program, Western Region - Alaska Section
    Attn: Frederic H. Wilson
    Geologist
    4200 University Drive
    Anchorage, AK
    USA

    907-786-7448 (voice)
    fwilson@usgs.gov
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    The distributor assumes no liability.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 05-Dec-2014
Metadata author:
U.S. Geological Survey Mineral Resources Program, Western Region - Alaska Section
Attn: Nora Shew
Geologist
4200 University Drive
Anchorage, AK
USA

907-786-7445 (voice)
nshew@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


This page is <http://mrdata.usgs.gov/metadata/ardf.faq.html>

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