ardf_keywords.gdb

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Title: ardf_keywords.gdb
Abstract:
Geodatabase ardf_keywords.gdb was designed to evaluate records in the Alaska Resource Data File (ARDF; http://ardf.wr.usgs.gov) to estimate the resource potential of various mineral deposit models in the state of Alaska. The geodatabase includes point feature class ardfcomp_pnt (geospatial version of ARDF), keyword tables (list of keywords with weighting factors), keyword_ardf point feature classes (scoring results from the keyword search on ARDF records), and tables with specific ARDF records identified to be relevant to the deposit model of interest. Each point feature class is also provided as a shapefile with the same name. Each keyword table is provided as a comma separtated text file.
Supplemental_Information:
The Alaska Resource Data File (ARDF; http://ardf.wr.usgs.gov) is a database containing descriptive information of mines, prospects, and mineral occurrences in Alaska. The site descriptions are compiled from published literature and from unpublished reports and data from industry, the U.S. Bureau of Mines, the U.S. Geological Survey, and other sources. Compilation of this database is an ongoing process and each record is essentially a progress report.
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, ardf_keywords.gdb:.

    This is part of the following larger work.

    Susan M. Karl (ed.), James V. Jones, III (ed.), and Timothy S. Hayes (ed.), 2016, GIS-based identification of areas that have resource potential for critical minerals in six selected groups of deposit types in Alaska: U.S. Geological Survey Open-File Report 2016-1191.

    Online Links:

    Other_Citation_Details:
    The larger work includes data sets for mineral resource data, geochemistry (stream sediment, rock, soil, mineral, and heavy mineral concentrate), igneous rock geochemical indices, lihology, aeroradiometric data, and hydrologic units analyzed for select deposit types.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: 172.82
    East_Bounding_Coordinate: -130.016
    North_Bounding_Coordinate: 69.63
    South_Bounding_Coordinate: 51.6
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2015Currentness_Reference: download date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: geodatabase
  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?
      The map projection used is NAD 1983 Alaska Albers (Meters).
      Projection parameters:
      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    ardfcomp_pnt
    Alaska Resource Data File (ARDF) (Source: http://ardf.wr.usgs.gov)
    ARDF_no
    A unique label assigned to each ARDF site. The form of the label is a two-letter quadrangle code followed by a three digit number. (Source: ARDF) Each ARDF_no is a two-letter quadrangle code and three digit number.
    Site
    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. (Source: ARDF) free text
    Site_type
    Type of ARDF site: mine, prospect, or occurrence. The published ARDF data set includes these undescribed entries: 'Mine and prospect'; 'Mine?', 'Mines(?)'; 'Occurrence?', 'Prospect; Mine', 'Prospect?', and 'Prospects?'. (Source: ARDF)
    ValueDefinition
    MineMines have had past production.
    ProspectProspects have had some development work.
    OccurrenceMineral occurrences include unexplored or incompletely explored occurrences of minerals of economic interest, geochemical anomalies, and rock or soil color anomalies.
    Site_status
    Inactive or active. The published ARDF data set includes these undescribed entries: 'Active?' and 'Inactive?' (Source: ARDF)
    ValueDefinition
    ActiveActive designates recent work at the time of record entry or update. The determination of this status is not meant to reflect the legal status of the site, but rather indicates the appearance of exploration activity to the compiler.
    InactiveInactive designates absence of recent work at the time of record entry or update.
    UndeterminedValue 'Undetermined' means that the reporter did not know the status at the time the record was created or updated.
    Production
    Indication of production. (Source: ARDF) Either 'Yes', 'No', or 'Undetermined'. "Yes" may be qualified as small, medium, large, or queried.
    Production_notes
    More extensive (and variable) information about production at the site, if known. (Source: ARDF) free text
    Reserves
    Reserve figures and references to their source. Field may include estimates based on a variety of assumptions at various times; this can result in conflicting assessments. This field may also include resource estimates based on probable or possible extensions of the deposit as defined. (Source: ARDF) free text
    Workings_explorations
    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. (Source: ARDF) free text
    Last_report_date
    Date of record entry or the most recent record update. (Source: ARDF) Calendar date
    Latitude
    Latitude of the site in decimal degrees, datum NAD1927. Some sites cover large areas and the given location is an approximate center of the area. (Source: ARDF)
    Range of values
    Minimum:51.6
    Maximum:69.63
    Units:degrees
    Longitude
    Longitude of the site in decimal degrees, NAD1927. Some sites cover large areas and the given location is an approximate center of the area. (Source: ARDF)
    Range of values
    Minimum:-178.77
    Maximum:178.8
    Units:degrees
    Location
    A narrative description of the location of the site and its areal extent, which should also include information on the reliability of the location. (Source: ARDF) free text
    Quad_250
    Two letter abbreviation indicating the 1:250,000 scale USGS topographic map on which the site is located. (Source: ARDF)
    ValueDefinition
    ACArctic
    ADAdak
    AFAfognak
    AKAtka
    ANAnchorage
    ARAmbler River
    ATAttu
    BBBristol Bay
    BCBradfield Canal
    BDBig Delta
    BGBering Glacier
    BHBethel
    BMBaird Mountains
    BNBendeleben
    BRBlack River
    BSBlying Sound
    BTBettles
    BVBeaver
    CACandle
    CBCold Bay
    CGChignik
    CHChandalar
    CICircle
    CLChandler Lake
    COColeen
    CRCraig
    CSChristian
    CVCordova
    CYCharley River
    DEDixon Entrance
    DIDillingham
    DLDe Long Mountains
    DPDemarcation Point
    EAEagle
    FBFairbanks
    FPFalse Pass
    GIGareloi Island
    GOGoodnews
    GUGulkana
    HCHoly Cross
    HEHealy
    HGHagemeister Island
    HUHughes
    HWHoward Pass
    IBIcy Bay
    IDIditarod
    ILIliamna
    JUJuneau
    KCKetchikan
    KDKodiak
    KHKantishna River
    KLKillik River
    KNKenai
    KRKarluk
    KZKotzebue
    LCLake Clark
    LGLivengood
    LHLime Hills
    MCMcCarthy
    MDMedfra
    MFMount Fairweather
    MGMcGrath
    MHMount Hayes
    MIMiddleton Island
    MKMount Katmai
    MLMount Michelson
    MMMount McKinley
    MUMisheguk Mountain
    MZMelozitna
    NBNabesna
    NKNaknek
    NLNulato
    NMNome
    NRNorton Bay
    NTNoatak
    OPOphir
    PAPort Alexander
    PEPetersburg
    PLPoint Lay
    PMPort Moller
    PRPrince Rupert
    PSPhilip Smith Mountains
    RBRuby
    RIRat Islands
    RMRussian Mission
    SBStepvak Bay
    SDSumdum
    SESelawik
    SHShugnak
    SISitka
    SKSkagway
    SLSaint Lawrence
    SMSleetmute
    SNSimeonof Island
    SOSolomon
    SPSurvey Pass
    SRSeward
    SVSeldovia
    SWSutwik Island
    TATaylor Mountains
    TBTable Mountain
    TCTanacross
    TETeller
    TITrinity Island
    TKTalkeetna Mountains
    TLTalkeetna
    TNTanana
    TRTaku River
    TYTyonek
    UGUgashik
    UKUmnak
    ULUnalakleet
    UMUnimak
    UNUnalaska
    UTUtukok River
    VAValdez
    WIWiseman
    YAYakutat
    Commodities_main
    List of elements or commodities of real or potential economic value in the site. Commodities_main is the dominant commodities of economic interest. For some deposits, the list of commodities is only a list of elements identified in a sample(s) and does not necessarily indicate the commodities that ultimately may be most important at the site. Common industrial minerals, such as sand and gravel, crushed stone, and limestone, are not included in this data base. Also not included are energy minerals, such as peat, coal, and oil and gass, although uranium and thorium are included. The data base does include certain high value industrial minerals, such as barite and rare earth elements. (Source: ARDF) free text
    Commodities_other
    List of elements or commodities of real or potential economic value that are present in minor amounts. For some deposits, the list of commodities is only a list of elements identified in a sample(s) and does not necessarily indicate the commodities that ultimately may be most important at the site. Common industrial minerals, such as sand and gravel, crushed stone, and limestone, are not included in this data base. Also not incluced are energy minerals, such as peat, coal, and oil and gass, although uranium and thorium are included. The data base does include certain high value industrial minerals, such as barite and rare earth elements. (Source: ARDF) free text
    Ore_minerals
    List of minerals at the site, usually metallic, which are of potential economic value. (Source: ARDF) free text
    Gangue_minerals
    List of the non-economic minerals at the site that cannot be avoided in mining but are separated during concentration. (Source: ARDF) free text
    Geologic_description
    A description of the local geology and character of the deposit. To the extent possible, the description includes information on the host rock, structure of the host and mineralized system, mineralogical relations, and the shape and form of the deposit. (Source: ARDF) free text
    Alteration
    Description of the alteration related to the deposit. (Source: ARDF) free text
    Age
    Age of mineralization and a explanation of the evidence for the age, if warranted. (Source: ARDF) free text
    Deposit_model
    A name or names based on descriptive or genetic mineral deposit models presented in Cox and Singer (1986), Bliss (1992), or other indicated references. The model or models picked are those that appear most appropriate to the compiler(s) of the site record on the basis of the description and setting of the deposit.
    Bliss, J.D., ed., 1992, Developments in mineral deposit modeling: U.S. Geological Survey Bulletin 2004, 168 p. http://pubs.usgs.gov/bul/b2004/index.html
    Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p. http://pubs.usgs.gov/bul/b1693/ (Source: ARDF) free text
    Deposit_model_number
    The mineral deposite model number or numbers derived from the models presented in Cox and Singer (1986) or Bliss (1992). (Source: ARDF) free text
    Additional_comments
    Pertinent information not appropriate for the other fields in the data base. (Source: ARDF) free text
    Primary_reference
    The best reference describing the occurrence, although it may be an incomplete description. (Source: ARDF) free text
    Expanded_References
    List of known references, including the primary reference, that discuss the occurrence or are applicable to its description. (Source: ARDF) free text
    Reporter
    Individual(s) responsible for completion of the record. (Source: ARDF) free text
    Reporter_affiliation
    Institutional affliation of the reporter(s). (Source: ARDF) free text
    cu_carb_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of carbonate-hosted Cu deposits. The following list of Attribute_Labels pertain to the keyword tables for all six deposit models. (Source: this data set)
    ADDITIONAL_COMMENTS_DEF
    List of keywords with definite relevance to the sandstone uranium deposit model that were searched for in field 'Additional_comments' in point feature class ardfcomp_pnt. (Source: this data base) free text
    ADDITIONAL_COMMENTS_DEF_WGT
    Weighting factor used to score the keyword in field ADDITIONAL_COMMENTS_DEF. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:5
    ALTERATION_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Alteration' in point feature class ardfcomp_pnt. (Source: this data base) free text
    ALTERATION_DEF_WGT
    Weighting factor used to score the keyword in field ALTERATION_DEF. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:5
    ALTERATION_MAY
    List of keywords which may have relevance to the mineral deposit of interest that were searched for in field 'Alteration' in point feature class ardfcomp_pnt. (Source: this data set) free text
    ALTERATION_MAY_WGT
    Weighting factor used to score the keyword in ALTERATION_MAY. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:3
    COMMODITIES_MAIN_DEF
    List of keywords with definite relevance to the mineral deposit model of interest that were searched for in field 'Commodities_main' in point feature class ardfcomp_pnt. (Source: this data set) free text
    COMMODITIES_MAIN_DEF_WGT
    Weighting factor used to score the keyword in COMMODITIES_MAIN_DEF. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:3
    COMMODITIES_MAIN_MAY
    List of keywords which may be relevant to the mineral deposit of interest that were searched for in field 'Commodites_main' in point feature class ardfcomp_pnt. (Source: this data set) free text
    COMMODITIES_MAIN_MAY_WGT
    Weighting factor used to score the keyword in COMMODITIES_MAIN_MAY. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:3
    COMMODITIES_OTHER_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Commodites_other' in point feature class ardfcomp_pnt. (Source: this data set) free text
    COMMODITIES_OTHER_DEF_WGT
    Weighting factor used to score the keyword in COMMODITIES_OTHER_DEF. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:3
    COMMODITIES_OTHER_MAY
    List of keywords which may be relevant to the mineral deposit of interest that were searched for in field 'Commodites_other' in point feature class ardfcomp_pnt. (Source: this data set) free text
    COMMODITIES_OTHER_MAY_WGT
    Weighting factor used to score the keyword in COMMODITIES_OTHER_MAY. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    DEPOSIT_MODEL_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Deposit_model' in point feature class ardfcomp_pnt. (Source: this data set) free text
    DEPOSIT_MODEL_DEF_WGT
    Weighting factor used to score the keyword in DEPOSIT_MODEL_DEF. (Source: this data set)
    Range of values
    Minimum:-6
    Maximum:5
    DEPOSIT_MODEL_MAY
    List of keywords which may have relevance to the mineral deposit of interest that were searched for in field 'Deposit_model' in point feature class ardfcomp_pnt. (Source: this data set) free text
    DEPOSIT_MODEL_MAY_WGT
    Weighting factor used to score the keyword in DEPOSIT_MODEL_MAY. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:3
    DEPOSIT_MODEL_NUMBER_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Deposit_model_number' in point feature class ardfcomp_pnt. (Source: this data set) free text
    DEPOSIT_MODEL_NUMBER_DEF_WGT
    Weighting factor used to score the keyword in DEPOSIT_MODEL_NUMBER_DEF. (Source: this data set)
    Range of values
    Minimum:-10
    Maximum:20
    DEPOSIT_MODEL_NUMBER_MAY
    List of keywords which may have relevance to the mineral deposit of interest that were searched for in field 'Deposit_model_number' in point feature class ardfcomp_pnt. (Source: this data set) free text
    DEPOSIT_MODEL_NUMBER_MAY_WGT
    Weighting factor used to score the keyword in DEPOSIT_MODEL_NUMBER_MAY. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    HOST_ROCK_DEF
    List of keywords with definite relevance to the sandstone uranium model that were searched for in field 'Host_rock' in point feature class ardfcomp_pnt. (Source: this data set) free text
    HOST_ROCK_DEF_WGT
    Weighting factor used to score the keyword in HOST_ROCK_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:5
    GANGUE_MINERALS_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Gangue_minerals' in point feature class ardfcomp_pnt. (Source: this data set) free text
    GANGUE_MINERALS_DEF_WGT
    Weighting factor used to score the keyword in GANGUE_MINERALS_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:3
    GANGUE_MINERALS_MAY
    List of keywords which may have relevance to the mineral deposit of interest that were searched for in field 'Gangue_minerals' in point feature class ardfcomp_pnt. (Source: this data set) free text
    GANGUE_MINERALS_MAY_WGT
    Weighting factor used to score the keyword in GANGUE_MINERALS_MAY. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:3
    ORE_MINERALS_DEF
    List of keywords with definite relevance to the mineral deposit of interest searched for in field 'Ore_minerals' in point feature class ardfcomp_pnt. (Source: this data set) free text
    ORE_MINERALS_DEF_WGT
    Weighting factor used to score keyword in ORE_MINERALS_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:5
    ORE_MINERALS_MAY
    List of keywords which may have relevance to the mineral deposit of interest searched for in field 'Ore_minerals' in point feature class ardfcomp_pnt. (Source: this data set) free text
    ORE_MINERALS_MAY_WGT
    Weighting factor used to score keyword in ORE_MINERALS_MAY. (Source: this data set)
    Range of values
    Minimum:-3
    Maximum:3
    PRODUCTION_DEF
    LIst of keywords with definite relevance to the placer gold deposit model that were searched for in field 'Production' in point feature class ardfcomp_pnt. (Source: this data set) free text
    PRODUCTION_DEF_WGT
    Weighting factor used to score the keyword in PRODUCTION_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:10
    PRODUCTION_NOTES_DEF
    LIst of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Production_notes' in point feature class ardfcomp_pnt. (Source: this data set) free text
    PRODUCTION_NOTES_DEF_WGT
    Weighting factor used to score the keyword in PRODUCTION_NOTES_DEF. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:3
    RESERVES_DEF
    List of keywords with definite relevance to the mineral deposit of interest that were searched for in field 'Reserves' in point feature class ardfcomp_pnt. (Source: this data set) free text
    RESERVES_DEF_WGT
    Weighting factor used to score the keyword in field RESERVES_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:3
    SITE_STATUS_DEF
    List of keywords with definite relevance to the placer gold deposit model that were searched for in field 'Site_status' in point feature class ardfcomp_pnt. (Source: this data set) free text
    SITE_STATUS_DEF_WGT
    Weighting factor used to score the keyword in field SITE_STATUS_DEF. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:7
    SITE_TYPE_DEF
    List of keywords with definite relevance to the placer gold deposit model that were searched for in field 'Site_type' in point feature class ardfcomp_pnt. (Source: this data set) free text
    SITE_TYPE_DEF_WGT
    Weighting factor used to score the keyword in field SITE_TYPE_DEF. (Source: this data set)
    Range of values
    Minimum:20
    Maximum:40
    granite_suite_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of Sn-W-Mo (-Ta-In-Fluorspar) deposits associated with specialized granites. See Entity_Type_Label cu_carb_keywords for Attribute information. (Source: this data set)
    placer_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of placer and paleoplacer gold deposits. See Entity_Type_Label cu_carb_keywords for Attribute information. (Source: this data set)
    ree_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of REE-Th-Y-Nb (-U-Zr) deposits associated with peralkaline to carbonatitic igneous rocks. See Entity_Type_Label cu_carb_keywords for Attribute information. (Source: this data set)
    sandstone_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of sandstone U (-V-Cu) deposits. See Entity_Type_Label cu_carb_keywords for Attribute information. (Source: this data set)
    ultramafic_keywords
    Table containing the keywords and weighting for scoring fields in point feature class ardfcomp_pnt (Alaska Resource Data File, ARDF) for estimating potential of PGE (-Co-Cr-Ni-Ti-V) deposits associated with mafic and ultramafic igneous rocks. See Entity_Type_Label cu_carb_keywords for Attribute information. (Source: this data set)
    cu_carb_keywords_ardf
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating the potential of carbonate-hosted Cu deposits. The following list of Attribute_Labels pertain to point features classes for all six deposit models, though not all fields are used for every deposit model.
    See Attribute_Definition for feature class ardfcomp_pnt for the following Attribute_Labels: ARDF_no, Site, Site_type, Site_status, Production, Production_notes, Reserves, Workings_exploration, Last_report_date, Latitude, Longitude, Location, Quad_250, Commodities_main, Commodities_other, Ore_minerals, Gangue_minerals, Geologic_description, Alteration, Age, Host_rock, Deposit_model, Deposit_model_number, Additional_comments, Primary_reference, Expanded_References, Reporter, and Reporter_affiliation. (Source: this data set)
    ARDF_no
    Unique identifier linking to ARDF site in point feature class ardfcomp_pnt. See Attribute_Definition for ARDF_no in feature class ardfcomp_pnt. (Source: this data set) Each ARDF_no is a two letter quadrangle code and three digit number.
    ALTERATION_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in ALTERATION_DEF and ALTERATION_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-8
    Maximum:19
    DEPOSIT_MODEL_DEF
    Sum of scores based for each ARDF site based on the search for keywords and weighting factors listed in DEPOSIT_MODEL_DEF and DEPOSIT_MODEL_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-19
    Maximum:20
    DEPOSIT_MODEL_NUMBER_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in DEPOSIT_MODEL_NUMBER_DEF and DEPOSIT_MODEL_NUMBER_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-50
    Maximum:20
    GANGUE_MINERALS_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in GANGUE_MINERALS_DEF and GANGUE_MINERALS_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:6
    ORE_MINERALS_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in ORE_MINERALS_DEF and ORE_MINERALS_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-21
    Maximum:40
    PRODUCTION_NOTES_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in PRODUCTION_NOTES_DEF and PRODUCTION_NOTES_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:18
    HOST_ROCK_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in HOST_ROCK_DEF and HOST_ROCK_DEF_WGT in keyword table sandstone_keywords. (Source: this data set)
    Range of values
    Minimum:-12
    Maximum:13
    ADDITIONAL_COMMENTS_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors lised in ADDITIONAL_COMMENTS_DEF and ADDITIONAL_COMMENTS_DEF_WGT in the keyword table sandstone_keywords. (Source: this data set)
    Range of values
    Minimum:-9
    Maximum:9
    RESERVES_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in RESERVES_DEF and RESERVES_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:31
    SITE_TYPE_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in SITE_TYPE_DEF and SITE_TYPE_DEF_WGT in the keyword table placer_keywords. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:120
    SITE_STATUS_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in SITE_STATUS_DEF and SITE_STATUS_DEF_WGT in the keyword table placer_keywords. (Source: this data set)
    Range of values
    Minimum:-4
    Maximum:14
    PRODUCTION_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in PRODUCTION_DEF and PRODUCTION_DEF_WGT in the keyword table placer_keywords. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:15
    ALTERATION_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors lised in ALTERATION_MAY and ALTERATION_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-18
    Maximum:16
    DEPOSIT_MODEL_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in DEPOSIT_MODEL_MAY and DEPOSIT_MODEL_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-8
    Maximum:22
    DEPOSIT_MODEL_NUMBER_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in DEPOSIT_MODEL_MAY and DEPOSIT_MODEL_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:6
    GANGUE_MINERALS_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors lised in GANGUE_MINERALS_MAY and GANGUE_MINERALS_MAY_WGT in the keyword table for the mineral deposit. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:10
    ORE_MINERALS_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in ORE_MINERALS_MAY and ORE_MINERALS_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-14
    Maximum:12
    COMMODITIES_MAIN_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in COMMODITIES_MAIN_DEF and COMMODITIES_MAIN_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-24
    Maximum:18
    COMMODITIES_OTHER_DEF
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in COMMODITIES_OTHER_DEF and COMMODITIES_OTHER_DEF_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-24
    Maximum:18
    COMMODITIES_MAIN_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in COMMODITIES_MAIN_MAY and COMMODITIES_MAIN_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:8
    COMMODITIES_OTHER_MAY
    Sum of scores for each ARDF site based on the search for keywords and the weighting factors listed in COMMODITIES_OTHER_MAY and COMMODITIES_OTHER_MAY_WGT in the keyword table for the deposit model. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:11
    COMMODITIES_DEFINITE
    Sum of values in COMMODITIES_MAIN_DEF and COMMODITIES_OTHER_DEF. (Source: this data set)
    Range of values
    Minimum:-33
    Maximum:29
    COMMODITIES_MAYBE
    Sum of values in COMMODITIES_MAIN_MAY and COMMODITIES_OTHER_MAY. (Source: this data set)
    Range of values
    Minimum:-5
    Maximum:11
    COMMODITIES_TOTAL
    Sum of values in COMMODITIES_DEFINITE and COMMODITIES_MAYBE. (Source: this data set)
    Range of values
    Minimum:-33
    Maximum:29
    TOTAL_DEFINITE
    Sum of values in ALTERATION_DEF, DEPOSIT_MODEL_DEF, DEPOSIT_MODEL_NUMBER_DEF, GANGUE_MINERALS_DEF, ORE_MINERALS_DEF, PRODUCTION_NOTES_DEF, HOST_ROCK_DEF, ADDITIONAL_COMMENTS_DEF, RESERVES_DEF, SITE_TYPE_DEF, SITE_STATUS_DEF, PRODUCTION_DEF, COMMODITIES_MAIN_DEF, and COMMODITIES_OTHER_DEF. (Source: this data set)
    Range of values
    Minimum:-59
    Maximum:136
    TOTAL_MAYBE
    Sum of values in ALTERATION_MAY, DEPOSIT_MODEL_MAY, DEPOSIT_MODEL_NUMBER_MAY, GANGUE_MINERALS_MAY, ORE_MINERALS_MAY, COMMODITIES_MAIN_MAY, and COMMODITIES_OTHER_MAY. (Source: this data set)
    Range of values
    Minimum:-15
    Maximum:41
    TOTAL
    Sum of values in TOTAL_DEFINITE and TOTAL_MAYBE. (Source: this data set)
    Range of values
    Minimum:-59
    Maximum:136
    PLACER_TOTAL
    Value of TOTAL_DEFINITE less the sum of values for DEPOSIT_MODEL_DEF and DEPOSIT_MODEL_NUMBER_DEF. (Source: this data set)
    Range of values
    Minimum:0
    Maximum:130
    granite_suite_keywords_ardf
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating potential of Sn-W-Mo (-Ta-In_Fluorspar) deposits associated with specialized granites. See Entity_Type_Label cu_carb_keywords_ardf for Attribute information. (Source: this data set)
    placer_keywords_ardf
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating potential of placer and paleoplacer gold deposits. See Entity_Type_Label cu_carb_keywords_ardf for Attribute information. (Source: this data set)
    ree_keywords
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating potential of REE-Th-Y-Nb (-U-Zr) deposits associated with peralkaline to carbonatitic igneous rocks. See Entity_Type_Label cu_carb_keywords_ardf for Attribute information. (Source: this data set)
    sandstone_keywords_ardf
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating potential of sandstone U (-V-Cu) deposits. See Entity_Type_Label cu_carb_keywords_ardf for Attribute information. (Source: this data set)
    ultramafic_keywords_ardf
    Point feature class containing the ARDF sites with ARDF data, and the calculated scores based on the keyword search criteria of select fields for estimating potential of PGE (-Co-Cr-Ni-Ti-V) deposits associated with mafic and ultramafic igneous rocks. See Entity_Type_Label cu_carb_keywords_ardf for Attribute information. (Source: this data set)
    ARDF_PGE_calls
    This table includes ARDF sites that scored favorable for PGEs by the keyword search. Each site is reviewed and further classified. (Source: this data set)
    ARDF_no
    Unique identifier linking to ARDF site in point feature class ardfcomp_pnt. (Source: this data set) Each ARDF_no is a two letter quadrangle code and three digit number.
    CALL
    CALL is a classification of how this ARDF site may be a favorable PGE deposit. Each site is reviewed and further classified as (1) y - PGE reported as major or minor commodities, (2) r - chromite and favorable geology, or (3) m - permissible geology but no direct evidence for PGE. (Source: this data set)
    ValueDefinition
    yLocality has PGE reported as major or minor commodities.
    rLocality has chromite and favorable geology.
    mLocality has permissible geology but no direct evidence for PGE.
    ARDF_PGEplacer_calls
    This table includes ARDF placer sites that score favorable for PGEs by the keyword search. Each site is reviewed and further classified. (Source: this data set)
    ARDF_no
    Unique identifier linking to ARDF site in point feature class ardfcomp_pnt. (Source: this data set) Each ARDF_no is a two letter quadrangle code and three digit number.
    CALL
    CALL is a classification of how this ARDF site may be a favorable PGE deposit. Each site is reviewed and further classified as (1) y - PGE reported as major or minor elements, (2) m - chromite or other PGE-related minerals, or questioned PGE identifications, and (3) other - mineralogy for MUM rocks in a drainage but no other direct evidence for PGE. (Source: this data set)
    ValueDefinition
    yLocality has PGE reported as major or minor elements.
    mLocality has chromite or other PGE-related minerals, or questioned PGE identifications.
    otherLocality has mineralogy for MUM rocks in a drainage but no direct evidence for PGE.
    ARDF_ssU_calls
    This table includes ARDF sites that scored favorable for sandstone uranium deposit model by the keyword search. Each site is reviewed and further classified. (Source: this data set)
    ARDF_no
    Unique identifier linking to ARDF site in point feature class ardfcomp_pnt. (Source: this data set) Each ARDF_no is a two letter quadrangle code and three digit number.
    CALL
    CALL is a classification of how this ARDF site may be a favorable sandstone uranium deposit model. Each site is reviewed for whether (1) if the model type is sandstone uranium or roll-front, (2) if site is described as lode, granite, vein, dike, phosphates, or skarn, and (3) if it is a placer with U present as either a major or minor commodity. (Source: this data set)
    ValueDefinition
    noLocality description is not model type sandstone uranium or roll-front, and/or includes the terms lode, granite, vein, dike, phosphate, or skarn.
    maybeLocality description may be considered a model type sandstone uranium or roll-front, and excludes the terms lode, granite, vein, dike, phosphate, and skarn.
    placerLocality is a placer with U present as either a major or minor commodity.
    yesLocality description is model type sandstone urnaium or roll-front, and excludes the terms lode, granite, vein, dike, phosphate, and skarn.

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

Why was the data set created?

The Alaska Resource Data File, ARDF, is a database containing information about mines, prospects, and mineral occurrences in Alaska. It is used to here to analyze for the six deposit models. The ARDF records were used to create point feature class ardfcomp_pnt. To score each ARDF location, a list of keywords with weighting factors was created for each deposit model. The results of the keyword searches are contained in the deposit specific point feature classes, such as placer_keywords_ardf. The keyword search scores are used in the analysis for favorable setting for each mineral deposit type in each hydrologic subwatershed. The analyses for the PGE and sandstone uranium deposit models also used lists of specific ARDF sites to score for favorable setting.

How was the data set created?

  1. From what previous works were the data drawn?
    ARDF (source 1 of 1)
    U.S. Geological Survey, Unknown, Alaska Resource Data File (ARDF).

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    The Alaska Resource Data File, ARDF, is a database containing descriptive information of mines, prospects, and mineral occurrences in Alaska. ARDF is one of the data layers used to analyze for mineral resource potential in Alaska. A list of keywords was developed for each deposit model to search for in the ARDF records. These keyword searches were weighted and scored, and then included in the analyses for mineral resource potential in the state of Alaska.
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 3)
    ARDF records are maintained as a Filemaker Pro database. The records were exported to CSV file, then converted to an ESRI point feature class.
    Date: 2015 (process 2 of 3)
    Tables containing keywords and weighting factors were created for each deposit model. Keywords lists were produced for the following ARDF fields: alteration, commodities main, commodities other, deposit model, deposit model number, gangue minerals, ore minerals, production notes, and reserves. In addition, the sandstone uranium model has keyword lists for host rock and additional comments fields, and placer gold has keyword lists for site type, site status and production.
    Deposit models PGE and sandstone uranium have additional tables which contain specific attributes for select ARDF localities. These attributes are used in the HUC analyses for favorable settings for these models.
    Date: 2015 (process 3 of 3)
    A copy of point feature class ardfcomp_pnt was created for each deposit model. For each of these deposit specific feature classes, the ARDF sites were searched for the presence of the deposit's keywords in certain fields. The scores for the presence of keywords is stored in one of the appended fields.
  3. What similar or related data should the user be aware of?
    U.S. Geological Survey, Unknown, Alaska Resource Data File (ARDF).

    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 ARDF site location is given in decimal degrees. Some sites are areas rather than points and the geographic coordinates are an approximate center of the area. A narrative description of the location and precision of the location is given in the field 'Location'.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This GIS representation of ARDF does not include field Workings/exploration.
  5. How consistent are the relationships among the observations, including topology?
    An ARDF location may be a single geographic location or an area, but it is represented with a single point.

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. Users are advised to read the metadata for the dataset thoroughly to understand appropriate use and data limitations.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    MS902
    Box 25286
    Denver Federal Center
    Lakewood, CO
    U.S.A.

    1-888-ASK_USGS (voice)
  2. What's the catalog number I need to order this data set? USGS Open-File Report 2016-1191
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitue or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 28-Dec-2015
Last Reviewed: 06-Sep-2016
Metadata author:
U.S. Geological Survey
Attn: Nora Shew
4210 University Drive
Anchorage, AK
U.S.A.

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

Generated by mp version 2.9.34 on Fri Nov 4 13:22:05 2016