Metadata: Identification_Information: Citation: Citation_Information: Originator: Nick A. Karl Originator: William R. Gnesda Originator: Jeffrey L. Mauk Originator: Amanda L. Ringer Publication_Date: 20210222 Title: Gallium Deposits in the United States Geospatial_Data_Presentation_Form: Vector Digital Data Set Series_Information: Series_Name: U.S. Geological Survey data release Issue_Identification: DOI: 10.5066/P9S73UYY Publication_Information: Publication_Place: Denver, CO Publisher: USGS ScienceBase Other_Citation_Details: Additional information on Originators: Karl, N.A., http://orcid.org/0000-0003-2858-2498; Gnesda, W.R., https://orcid.org/0000-0001-8968-2260; Mauk, J.L., http://orcid.org/0000-0002-6244-2774; Ringer, A.L., https://orcid.org/0000-0002-5331-8448. Suggested citation: Karl, N.A., Gnesda, W.R., Mauk, J.L., and Ringer, A.L., 2021, Gallium Deposits in the United States: U.S. Geological Survey data release, https://doi.org/10.5066/P9S73UYY. Online_Linkage: https://doi.org/10.5066/P9S73UYY Description: Abstract: This U.S. Geological Survey (USGS) data release provides the descriptions of the only U.S. sites—including mineral regions, mineral occurrences, and mine features—that have reported production and (or) resources of gallium (Ga). The sites in this data release have contained resource and (or) past production of more than 16 metric tons Ga metal, which was the approximate average annual consumption of Ga in the U.S. from 2016 through 2020. This dataset contains the Round Top deposit in Texas and the Apex deposit in Utah. Gallium occurs in many different minerals and rocks where substitution takes place with elements of similar size, such as zinc, or similar charge, such as aluminum. Therefore, Ga is primarily recovered as a byproduct of processing aluminum or zinc ores (Foley and others, 2017). Some U.S. zinc deposits contain up to 50 parts per million Ga, but Ga is not currently recovered from U.S. mineral deposits. Gallium is necessary for strategic, consumer, and commercial applications. Gallium is used in thin-film photovoltaics, and is important as an application for clean energy technologies. In 2020, the U.S. was 100 percent net import reliant on Ga from countries such as China, United Kingdom, Germany, and others (U.S. Geological Survey, 2021). The entries and descriptions in the database were derived from published papers, reports, data, and internet documents representing a variety of sources, including geologic and exploration studies described in State, Federal, and industry reports. Resources extracted from older sources might not be compliant with current rules and guidelines in minerals industry standards such as National Instrument 43-101 (NI 43-101). The presence of a Ga mineral deposit in this database is not meant to imply that the deposit is currently economic. Rather, these deposits were included to capture the characteristics of the largest Ga deposits in the United States. Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. The authors welcome additional published information in order to continually update and refine this dataset. Foley, N.K., Jaskula, B.W., Kimball, B.E., and Schulte, R.F., 2017, Gallium, chap. H of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. H1–H35, https://doi.org/10.3133/pp1802H. U.S. Geological Survey, 2021, Mineral commodity summaries 2021: U.S. Geological Survey, 200 p., https://doi.org/10.3133/mcs2021. Purpose: This dataset was developed as part of an ongoing effort by the U.S. Geological Survey to identify and quantify known significant deposits of critical minerals within the United States. In the case of gallium (Ga), sites listed herein have reported production and (or) resources of more than 16 metric tons Ga metal, which was the approximate average annual consumption of Ga in the U.S. from 2016 through 2020. The geospatial data provide location, geologic description, and production and resource information. In general, the USGS uses this information to identify and quantify known resources of critical minerals, delineate mineral resource permissive tracts (geographic areas in which specific types of mineral deposits may occur), develop assessments of potential undiscovered mineral resources, determine where and how environmental effects of mining may be observed, and understand the natural variability found in mineral deposits of particular types. The data also support the Federal strategic objective to secure reliable supplies of critical minerals by providing information for geoscience research and mineral exploration to State and Federal agencies, private industry, and the general public. Supplemental_Information: The Esri ArcGIS 10.8.1 geodatabase contains 1 point and 2 polygon feature classes, 8 attribute tables, and 15 relationship classes. Relationship classes link tables using the Ftr_ID or Site_ID fields. Feature classes are also provided as Esri shapefiles; attribute tables are provided as Excel and comma-separated values (CSV) files. The description of each database layer (feature class) and attribute table is provided below, followed by general information about concepts and terms used in the development of the database. Metadata is provided in extensible markup language (XML), hypertext markup language (HTML), and text-formatted (TXT) formats. DATABASE LAYERS AND TABLES The Loc_Pt feature class contains point locations of mineral regions, mineral occurrences (deposits), and mine features, and the attribute information describing the location, source report, scale of the map used to obtain the location, and if the location has a polygonal footprint in the Loc_Poly feature class. In the database, all features have point locations, except for surface workings. The Loc_Poly feature class contains footprints or polygons of areas, deposits, and mining districts. If a source report shows a location as a polygon, the polygon is digitized, and the approximate centroid of the polygon is added to the Loc_Pt layer. Attribute information about the location is provided in the Loc_Pt layer. Mines are represented as points in the database, even when footprints are presented in source reports. Where possible, the approximate extent of the mining operation area, determined from imagery, is presented in the surface workings (Loc_Poly_Sw) layer. The Loc_Poly_Sw feature class contains the approximate area of mining-related activity, or "surface workings" as shown on Esri imagery. These polygonal outlines have no corresponding point location in the database, nor do they have links to other tables. The attribute information for surface workings contains the date of the imagery and basic location information, including state and county names. Surface workings must be at least 1,000 feet (ft) (300 meters[m]) in one dimension to be digitized, and multiple workings that are 500 ft (150 m) or less apart are combined into one outline. No attempt is made to distinguish between the types of surface workings (for example, roads, pits, leach pads, waste piles, etc.), even when presented in source reports. No surface workings were delineated in this data release. The Dep_Model table contains mineral deposit model and geoenvironmental model classifications that are models established and used by the USGS for deposits included in the database. The Descr_Sum table contains relevant descriptions found in source reports. These descriptions are attributed according to the type of description, such as Geology, History, Production, Resources, etc. Descriptions pertain to individual features or to larger sites. The authors do not paraphrase or combine descriptions, and therefore, when a database feature is described in multiple reports, the feature will have multiple entries. The GeolMinOcc table contains information about the geology of mineral deposits and prospects. Every attempt was made to compile information as reported in the source report. For example, if one source report states the valuable material as "bastnaesite, galena", and another reports "sphalerite", the attribute field Value_Mat will contain all values. The value in the Ref_ID field is the primary source report for the record, for example, " Hulse and others (2019)". All information in the record comes from the primary source report unless an attribute field value contains a number in parentheses. This number denotes another source report whose Ref_ID is given in the Remarks field. Full citations for source reports are provided in the References table and adhere to USGS citation style. The History table contains information derived from publicly available sources regarding the status of a mineral region, mineral occurrence, or mine feature through time. Values in the Status field indicate a condition or phase for the time period stated in the Year_From and Year_To fields. This information may not reflect the current status of a feature. For example, if the attribute record shows the status of a mine is "Active" and the Year_From and Year_To dates are 1957 and 1971 respectively, the mine was active from 1957 and 1971; it is unknown if the mine is still active. The Last_Updt field shows the date that the record was last updated by the authors. The Production table contains published production data for mines. Production is listed by commodity and reported as shown in the source reports. Reported production values are totaled by the USGS authors for the time period defined by the Year_From and Year_To fields. If production is reported for a group of features, the Ftr_ID will show "-1111" and the production is assigned to the "site" or Site_ID that groups those mines on the Site table. The contained SI commodity amount (CntSIComAm) for the contained SI commodity (CntSICom) has been provided in one consistent unit (metric tons) for the user; these conversions are typically calculated by USGS authors. A value ending with "111" as a decimal trailer indicates the value was calculated by USGS authors. For example, if a grade is calculated by USGS authors to be 0.05 percent, the value recorded in the database will be 0.05111. Conversion factors used by USGS authors can be found on the USGS_Gallium_Merged_Excel file under the Conversions tab. Decimal trailers are not reported in the Entity and Attribute section for ranges. Where a range in values are provided for attribute fields such as Mat_Amnt, Grade, Contained, etc., the average of the range is reported within the field and the range of values are noted within the Remarks field. For consistency, production values are converted to the SI units by the USGS authors. The References table contains the citation of the map or report(s) from which the point, polygon, or attribute information is obtained. The table also assigns a short reference (Ref_ID) that is used throughout the database. This table does not have a relationship class allowing the user to relate to other tables because Ref_IDs from tables such as the Production table may have multiple references. The Resources table contains reported resource data for mineral deposits. Data are compiled for the most recent mineral resource estimate when available. Resource values were recorded as shown in source reports, including year reported, resource amount, units, and classification system(s). The definition of terms (for example, inferred, proven, probable, etc.) used in various resource classification systems may change through time. Resources extracted from older sources might not be compliant with current rules and guidelines in minerals industry standards such as NI 43-101 or the Joint Ore Reserves Committee Code (JORC Code). The way the resource is reported dictates the number of records for each deposit. For example, if data from a single deposit are reported for an inferred resource and a proven reserve, data from both classifications will be reported as separate records, unless it is stated that the proven reserve is inclusive of the inferred resource. If resource data are reported for a group of features rather than an individual deposit, the Ftr_ID will show "-1111" and the resource is assigned to the "site" or Site_ID that groups those deposits on the Site table. The attribute field CntSIComAm has been provided in one consistent unit (metric tons) for the user; these conversions are typically calculated by USGS authors. A value ending with "111" as a decimal trailer indicates the value was calculated by USGS authors. For example, if a value in the Grade field is calculated by USGS authors to be 0.05 percent, then the value recorded in the database will be 0.05111. Conversion factors used by the USGS authors can be found on the USGS_Gallium_Merged_Excel file under the Conversions tab. Decimal trailers are not reported in the Entity and Attribute section for ranges. Where a range in values is provided for attribute fields such as Mat_Amnt, Grade, Contained, etc., the average of the range is reported within the field and the range of values is noted within the Remarks field. For consistency, resource values are converted to the International System of Units (SI units) by the USGS authors. Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. The Site table is used to identify related features, such as a deposit and the mine(s) operating on it, or a mine and its related deposits. Each site has a unique identification value in the Site_ID field. A Site_ID is also assigned to mineral regions, such as mining districts, which are represented as a single polygon or point feature in the database. The Site_ID is used in all tables except the References table and Loc_Poly_Sw feature class. The Site table also indicates where information about a site occurs within the database. For example, if the Resources field in the Site table contains the value "Yes", resource information is available in the Resources table. GENERAL INFORMATION Mineral regions may be a mineralized area, a mineral district, or a mining district. Mineral areas have similar geology and deposit types. Mineral districts are usually named and are defined by a group of deposits of similar type, origin, and (or) commodity. Mining districts represent historic administrative areas organized by miners under the mining laws of the United States. Mining districts are typically an area containing a group of mines that exploited the same or related commodity. Mining district polygons may overlap. Mine features are man-made features associated with the process of extracting, processing, or concentrating ore materials. In this database, mine features have a point location, and where possible, the polygon boundary showing the extent of surface workings identified from imagery. No attempt is made to distinguish specific mine features such as pits, dumps, tailings, etc. within the surface workings outline. Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, can be deposits, prospects, or showings in USGS mineral deposit databases (USMIN). Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate. The locations of mineral regions, mine features, and mineral occurrences are commonly represented as points in source maps and reports, and occasionally as footprints (polygon outlines). In this database, all features have a point location, and some have an additional polygonal footprint. Surface workings in the Loc_Poly_Sw feature class are the exception—they do not have a corresponding point location or attribute information in the Loc_Pt feature class. Otherwise, for points that have polygonal boundaries, the Loc_Pt feature class attribute field Loc_Poly contains the value "Yes" and the boundary definition is described in the field Poly_Def field. For example, "Approximate extent of region on the map", or "Approximate extent of measured plus indicated and inferred resource classifications on the map". Each point and polygon feature is uniquely identified by a Ftr_ID. The Site_ID is used to indicate groups of related features, or "sites". Tables are linked (related) using the Ftr_ID or the Site_ID fields. Some tables have more than one record describing a feature. For example, a point denoting a mine location may have many records in the Production table that summarize the dates and amounts of material produced. The database is designed to allow the user to navigate from the point or polygon layers to the linked table information or from the tables to the point and polygon layers. All data are derived from publicly available sources. The Last_Updt field shows the date that the record was last updated by the USGS authors. Full citations are listed in the References table, and each citation is assigned a short citation (Ref_ID) that is used for identification in the database. Except for the Loc_Poly feature class, the primary reference(s) is noted in the Ref_ID field. Additional references are enumerated after attribute field values, and the corresponding short reference is in the Remarks field. As an example, one Commodity record shows "gallium; silver (1); zinc (1)". This indicates the commodities "gallium" was derived from the primary reference denoted in the Ref_ID field as "Utah Geological Survey (2020)" and "silver" and "zinc" were derived from a secondary reference denoted in the Remarks field as "(1) Bernstein (1986)". In the GeolMinOcc table, lists in different fields may not correspond. For example, if the Commodity field shows "copper; gallium; germanium", the Value_Mat field may list the associated ore minerals in a different order. The data in lists are alphabetized to prevent duplication of values as authors compile the dataset, with individual values separated by semicolons. Listed fields are present in the Site, Loc_Pt, and GeolMinOcc tables. Field or attribute records that contain "Null" values in the file geodatabase were checked for available data and no data were found. In some cases, an entire field may contain no information. These "Null" fields are maintained in the database structure for consistency with related USGS products and for possible future use if information becomes available. Additionally, values in the fields Commodity, and Material, may be lumped into groups such as rare-earth elements (REE), rare-earth oxide (REO), or total rare-earth oxide (TREO). For the purpose of the USMIN dataset, the rare-earth elements include the commodities cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), holmium (Ho), lanthanum (La), lutetium (Lu), neodymium (Nd), praseodymium (Pr), promethium (Pm), samarium (Sm), terbium (Tb), thulium (Tb), and ytterbium (Yb). Two points may occupy the same location. This occurs when there is a deposit with a mine, and the location of either the mine or the deposit is unknown. For example, a report provides a map showing the location of a deposit, and the report also provides production data for underground "Mine X" that is associated with the deposit but does not provide the location of "Mine X". In this case, a second point representing "Mine X" is placed at the point location of the deposit. Polygon features may overlap. Viewing polygons as outlines without color fills will show where polygon overlap occurs. In the attribute section of this metadata, attribute fields from all feature classes and tables are listed in alphabetic order; corresponding feature classes and tables are listed in parentheses after the field name in the Attribute Label. For example, "Mat_Amnt (Production, Resources)" indicates that the attribute field Mat_Amnt occurs in the Production table and in the Resources table. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1983 Ending_Date: 2020 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -113.959188 East_Bounding_Coordinate: -105.402707 North_Bounding_Coordinate: 37.194393 South_Bounding_Coordinate: 31.229618 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme_Keyword: economy Theme: Theme_Keyword_Thesaurus: Alexandria Digital Library Feature Type Thesaurus Theme_Keyword: mineral deposit areas Theme_Keyword: mine sites Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: critical minerals Theme_Keyword: economic geology Theme_Keyword: geographic information systems Theme_Keyword: geospatial datasets Theme_Keyword: metallic mineral resources Theme_Keyword: mineral deposits Theme_Keyword: mineral resources Theme_Keyword: natural resource exploration Theme_Keyword: aluminum Theme_Keyword: arsenic Theme_Keyword: beryllium Theme_Keyword: copper Theme_Keyword: gallium Theme_Keyword: germanium Theme_Keyword: hafnium Theme_Keyword: iron Theme_Keyword: lead Theme_Keyword: lithium Theme_Keyword: magnesium Theme_Keyword: manganese Theme_Keyword: niobium Theme_Keyword: potassium Theme_Keyword: rare earth elements Theme_Keyword: scandium Theme_Keyword: silver Theme_Keyword: sodium Theme_Keyword: tantalum Theme_Keyword: thorium Theme_Keyword: tin Theme_Keyword: uranium Theme_Keyword: yttrium Theme_Keyword: zinc Theme_Keyword: zirconium Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Department of the Interior Theme_Keyword: DOI Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Energy and Minerals Mission Area Theme_Keyword: Mineral Resources Program Theme_Keyword: MRP Theme_Keyword: Region 7: Upper Colorado Basin Theme_Keyword: Geology, Geophysics, and Geochemistry Science Center Theme_Keyword: GGGSC Theme_Keyword: USGS Mineral Deposit Database Theme_Keyword: USMIN Theme_Keyword: Earth Mapping Resources Initiative Theme_Keyword: Earth MRI Theme_Keyword: Bureau of Land Management Theme_Keyword: BLM Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: deposit type Theme_Keyword: Kipushi Cu-Pb-Zn Theme_Keyword: peralkaline intrusion-related REE deposits Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: adit Theme_Keyword: deposit Theme_Keyword: mining district Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Texas Place_Keyword: Utah Place_Keyword: Apex Place_Keyword: Round Top Place: Place_Keyword_Thesaurus: Common geographic areas Place_Keyword: United States Access_Constraints: None. Please see 'Distribution Info' for details. Use_Constraints: Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jeffrey L. Mauk Contact_Organization: U.S. Geological Survey Contact_Position: Research Geologist Contact_Address: Address_Type: mailing address Address: PO Box 25046, Mail Stop 973 City: Lakewood State_or_Province: CO Postal_Code: 80225 Country: US Contact_Voice_Telephone: 303-236-5605 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: jmauk@usgs.gov Data_Set_Credit: The data sets were developed by the U.S. Geological Survey Geology, Geophysics, and Geochemistry Science Center (GGGSC) with support from the Bureau of Land Management Solid Minerals Program. Database reviews and contributions were made by USGS personnel Bradley Van Gosen. Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft Office 365 ProPlus; Esri ArcGIS 10.8.1 (Build 14362) Service Pack N/A (Build N/A) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Unique values in text attribute fields were checked through frequency analyses for spelling, consistency of terms, accuracy, adherence to established vocabularies, and completeness. Numeric values were reviewed and verified by USGS authors. In published reports, numeric values are reported with variable precision. Numeric values that have trailing zeros after the decimal are truncated in ArcGIS. For example, an ore grade reported as 0.370 is stored as 0.37 in the ArcGIS table. The published ore grade is provided in the Remarks field. The CSV and Excel versions of the ArcGIS attribute tables will reflect the contents of the geodatabase table. Logical_Consistency_Report: The locations of mineral regions, mine features, and mineral occurrences (deposits) are represented as points, and some of these point locations have corresponding "footprints" or polygonal outlines. The polygonal footprint may represent the approximate outline of a mineral occurrence or mineral region. The exceptions are areas disturbed by mining-related activity, or surface workings, which are derived from imagery rather than published reports. Surface working outlines have no corresponding point location, nor do they have links to other tables. Polygonal outlines, except for surface workings, may overlap. Overlapping surface workings are merged into a single outline. Surface workings do not distinguish different types of mine features, such as pits, tailings piles, dumps, etc. Two points may occupy the same location. This occurs when there is a deposit with a mine, and the central location of either the mine or the deposit is unknown. For example, a report provides a map showing the location of a deposit. The report also provides production data for underground "Mine X" that is mining the deposit but does not provide the location of "Mine X". In this case, a second point representing "Mine X" is placed at the point location of the deposit. Completeness_Report: Mineral region, mine feature, and mineral occurrence geospatial and attribute data are compiled for the United States. Data are limited to publicly available sources for the time period between 1983 and 2020. Common literature sources include government and private industry annual reports, NI 43-101 reports, journal articles, company websites, and USGS publications. To more completely populate the Production and Resources tables, select values are calculated by USGS authors and are indicated by "111" as a decimal trailer. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Locations of features are compiled from published coordinates and by digitizing from georeferenced raster images of maps or imagery. The locational accuracy of features is dependent on the accuracy of the source maps, which generally ranged in map scale from 1:10,000 to 1:1,000,000. The scale of the source maps is recorded as "Large" for 1:24,000 scale or larger, "Medium" for maps scales between 1:24,000 and 250,000; and "Small" for scales smaller than 1:250,000, in the Loc_Scale field. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Vertical accuracy in the data set is not applicable. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: American Geosciences Institute Publication_Date: 1997 Title: Dictionary of mining, mineral, and related terms Edition: 2 Geospatial_Data_Presentation_Form: Publication (Book) Publication_Information: Publication_Place: Alexandria, VA Publisher: American Geosciences Institute Other_Citation_Details: American Geosciences Institute, 1997, Dictionary of mining, mineral, and related terms (2d ed.): Alexandria, VA, American Geosciences Institute, 646 p. Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: American Geosciences Institute (1997) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Geosciences Institute (1997) in this metadata. Source_Information: Source_Citation: Citation_Information: Originator: Canadian Institute of Mining, Metallurgy and Petroleum Publication_Date: 2014 Title: CIM definition standards for mineral resources & mineral reserves Geospatial_Data_Presentation_Form: publication Publication_Information: Publication_Place: CIM Website Publisher: Canadian Institute of Mining, Metallurgy and Petroleum Other_Citation_Details: Canadian Institute of Mining, Metallurgy and Petroleum, 2014, CIM definition standards for mineral resources & mineral reserves: Canadian Institute of Mining, Metallurgy and Petroleum web page, accessed May 4, 2020, at https://mrmr.cim.org/media/1128/cim-definition-standards_2014.pdf. Online_Linkage: https://mrmr.cim.org/media/1128/cim-definition-standards_2014.pdf Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2014 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Canadian Institute of Mining, Metallurgy and Petroleum (2014) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as Canadian Institute of Mining, Metallurgy and Petroleum (2014) in this metadata. Source_Information: Source_Citation: Citation_Information: Originator: Esri Publication_Date: 2020 Title: GIS dictionary Geospatial_Data_Presentation_Form: publication Other_Citation_Details: Esri, 2020, GIS dictionary: Esri web page, accessed May 4, 2020, at https://support.esri.com/en/other-resources/gis-dictionary. Online_Linkage: https://support.esri.com/en/other-resources/gis-dictionary Type_of_Source_Media: Digital and (or) Hardcopy Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Esri (2020) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Esri (2020) in these metadata. Source_Information: Source_Citation: Citation_Information: Originator: Klaus K.E. Neuendorf Originator: James P. Mehl, Jr. Originator: Julia A. Jackson Publication_Date: 2011 Title: Glossary of geology Edition: 5 Geospatial_Data_Presentation_Form: Publication (Book) Publication_Information: Publication_Place: Alexandria, VA Publisher: American Geosciences Institute Other_Citation_Details: Neuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., 2011, Glossary of geology (5th ed.): Alexandria, VA, American Geosciences Institute, 779 p. Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2011 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Neuendorf and others (2011) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Neuendorf and others (2011) in these metadata. Process_Step: Process_Description: A literature search of publicly available mineral resource information was conducted for gallium element deposits in the United States. Priority was given to identifying existing databases or compilations with high quality locations and data attributes that could be utilized directly in a geographic information system (GIS). The literature search identified sources of data on mines, mineral occurrences, mineral regions, and resource and production data. Relevant information was acquired, reviewed for quality and geospatial information, and digitally captured. Mines described in published reports were captured as point locations. Mining activity and production were recorded in the History and Production tables. Where possible, the approximate extent of the mining operation area was captured from imagery in the surface workings layer (see Loc_Poly_Sw). Surface workings were digitized if the ground disturbance was at least 1,000 feet (ft) (300 meters[m]) in one dimension. The outlines of adjacent surface workings were merged if they were within 500 ft (150 m) of one another. Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, were compiled and attributed as deposits. Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate. Mineral occurrences were represented as points and as polygons if the aerial extent or "footprint" of a deposit was available. Each polygon was attributed to describe the reported boundary type, such as the extent of the estimated resource, the grade limit or grade-thickness, or the limit of mineralization. The footprints of mineral deposits overlapped in some areas. Production and resource information is compiled as reported and consequently shows variable units. USGS authors made every attempt to provide material amount, grade, and contained commodity data. If two of the three values are reported, the missing value was calculated by the USGS authors. These values are denoted by "111" as a decimal trailer. For consistency, the three fields were converted to SI units by the USGS authors, and contained material is reported as metric tons for all commodities. Converted values are reported in fields denoted by "SI" in the field name. Where a range in values is provided for material amount, grade, etc., the average of the range is reported within the attribute field and the reported range is noted within the Remarks field. Mineral regions may be a mineralized area, a mineral district, or a mining district. Mineral areas have similar geology and deposit types. Mineral districts are usually named and are defined by a group of deposits of similar type, origin, and (or) commodity. Mining districts represent historic administrative areas organized by miners under the mining laws of the United States. Mining districts are typically an area containing a group of mines that exploited the same or related commodity. Mining district polygons may overlap. All data were spatially integrated using ArcGIS. All attribute data were compiled from publicly available sources published between 1983 and 2020. Standardized vocabularies were developed by USGS authors and include definitions from American Geosciences Institute (1997), Canadian Institute of Mining, Metallurgy and Petroleum (2014), Esri (2020), and Neuendorf and others (2011). Data were checked throughout the compilation process for accuracy of locations; and completeness, accuracy, and consistency of attributes. Process_Date: 2020 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 6 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 5 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Attribute Fields Entity_Type_Definition: The attribute fields contain attribute information associated with features or records in the data set. Attribute fields occur in data layer(s) noted in parentheses. Entity_Type_Definition_Source: USGS authors Attribute: Attribute_Label: Alteration (GeolMinOcc) Attribute_Definition: Alteration: the alteration associated with the mineralization of the mineral occurrence. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "bleaching; clay; hematite; kaolinite". Attribute: Attribute_Label: Approx_Lat (Site) Attribute_Definition: Approximate latitude: the approximate latitude of the center of the site area provided in the World Geodetic System of 1984 (WGS84) coordinates. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 31.265751 Range_Domain_Maximum: 37.108002 Attribute_Units_of_Measure: decimal degree Attribute: Attribute_Label: Approx_Lon (Site) Attribute_Definition: Approximate longitude: the approximate longitude of the center of the site area provided in the World Geodetic System of 1984 (WGS84) coordinates. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -113.876999 Range_Domain_Maximum: -105.445099 Attribute_Units_of_Measure: decimal degree Attribute: Attribute_Label: Area_Acres (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Area acres: the approximate area reported in U.S. acres. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4.728648 Range_Domain_Maximum: 47192.202239 Attribute_Units_of_Measure: acre Attribute: Attribute_Label: Area_SqKm (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Area square kilometers: the approximate area reported in square kilometers. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.019136 Range_Domain_Maximum: 190.980067 Attribute_Units_of_Measure: square kilometer Attribute: Attribute_Label: Assoc_Dep (Production) Attribute_Definition: Associated deposit: the Feature identification (Ftr_ID) of the deposit from which production occurred. The format for this field is "Mo" (mineral occurrence) followed by a 5-digit number. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field value is "Mo00001". Attribute: Attribute_Label: Assoc_Mat (GeolMinOcc) Attribute_Definition: Associated material: the material occurring with the valuable material(s) (minerals or rocks) but not considered ore or valuable. This is the same as gangue for metallic mineral deposits. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Fe-rich biotite; garnet". Attribute: Attribute_Label: CntSICom (Production, Resources) Attribute_Definition: Contained SI commodity: the Contained commodity of the Material reported by the source document. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Ga". Attribute: Attribute_Label: CntSIComAm (Production, Resources) Attribute_Definition: Contained SI commodity amount: the amount of Contained commodity converted to metric tons. If the commodity is reported as a compound, USGS authors convert the amount to the elemental amount. Calculated values are denoted by a "111" decimal trailer. Values in the Production table range from 0.7462 to 7,102 metric tons. Values in the Resources table range from 8.4 to 47,900,000 metric tons (shown below ). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 8.4 Range_Domain_Maximum: 47,900,000 Attribute_Units_of_Measure: metric tons (CntSIComUt). Attribute: Attribute_Label: CntSIComUt (Production, Resources) Attribute_Definition: Contained SI commodity unit: the unit of the Contained SI commodity amount (CntSIComAm). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: COG_SI (Production, Resources) Attribute_Definition: Cut-off grade SI: the Cut-off grade (CutOffGrad) reported by the source document, converted to elemental grade in International System of Units (SI) where appropriate. Calculated values are denoted by a "111" decimal trailer. No values are reported for the Production table. Values in the Resources table range from 18 to 428 with variable units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 18 Range_Domain_Maximum: 428 Attribute_Units_of_Measure: See COU_SI Attribute: Attribute_Label: Commodity (GeolMinOcc, Loc_Pt, Site) Attribute_Definition: Commodity: the commodity(ies) present or associated with the feature (mineral occurrence [Mo], mine feature [Mf], or mineral region [Mr]). Commodity values represent commodities in which the database has quantitative production and (or) resource data. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "copper; gallium; germanium". Attribute: Attribute_Label: Cont_Units (Production, Resources) Attribute_Definition: Contained units: the unit of mass reported by the source document for the Contained field. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: pounds Enumerated_Domain_Value_Definition: An imperial unit of mass equal to 16 ounces. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "tons". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tonnes Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "metric tons". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces Enumerated_Domain_Value_Definition: A unit for mass that is equal to 31.10348 grams. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Contained (Production, Resources) Attribute_Definition: Contained: the amount of the commodity present in the ore. Calculated values are denoted by a "111" decimal trailer. Values in the Production table range from 400 to 180,000 with variable units. Values in the Resources table range from 9.2 to 47,900,000 with variable units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 9.2 Range_Domain_Maximum: 47,900,000 Attribute_Units_of_Measure: See Cont_Units. Attribute: Attribute_Label: COU_SI (Production, Resources) Attribute_Definition: Cut-off unit SI: the Cut-off unit (CutOffUnit) converted to International System of Units (SI). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: $US per metric ton NSR Enumerated_Domain_Value_Definition: An SI unit for cut-off defined by U.S. dollars divided by metric tons of net smelter return (NSR). Also known as "$US per tonne NSR". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric ton Y Eq Enumerated_Domain_Value_Definition: A SI derived unit of density defined by mass in grams divided by mass in metric tons of yttrium (Y) equivalent. Also known as "grams per tonne Y Eq". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: County (Loc_Pt, Loc_Poly_Sw) Attribute_Definition: County: the name of the U.S. county where the feature is located. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Hudspeth". Attribute: Attribute_Label: CutOffGrad (Production, Resources) Attribute_Definition: Cut-off grade: the grade below which resources are not estimated or production did not occur. Calculated values are denoted by a "111" trailer. No values are reported for the Production table. Values in the Resources table range from 16 to 428 with variable units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 16 Range_Domain_Maximum: 428 Attribute_Units_of_Measure: See CutOffUnit Attribute: Attribute_Label: CutOffUnit (Production, Resources) Attribute_Definition: Cut-off unit: the unit reported by the source document for the Cut-off grade (CutOffGrad) field. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: $US per ton NSR Enumerated_Domain_Value_Definition: An imperial unit for cut-off defined by U.S. dollars divided by tons of net smelter return (NSR). Also known as "$US per short ton NSR". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per tonne Y Eq Enumerated_Domain_Value_Definition: A SI derived unit of density defined by mass in grams divided by mass in tonnes of yttrium (Y). Also known as "grams per metric tons Y Eq". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Dep_Model (Site) Attribute_Definition: Deposit model: indicates if information for a site is available in the Dep_Model table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Dep_Model table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Dep_Model table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Descr (Descr_Sum) Attribute_Definition: Description: detailed information that either expands or presents additional information on a feature or a site. Descriptions extracted from source documents are denoted with quotations (""). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Detailed description as reported by the source document. Attribute: Attribute_Label: Descr_Sum (Site) Attribute_Definition: Description summary: indicates if information is available in the Descr_Sum table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Descr_Sum table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Descr_Sum table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Descr_Type (Descr_Sum) Attribute_Definition: Description type: indicates which table or feature class a Description (Descr) refers to. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is “GeolMinOcc”. Attribute: Attribute_Label: DpMd_NoNm (Dep_Model) Attribute_Definition: Deposit model number and (or) name: the deposit model classification assigned to the deposit. Deposit model names starting with numbers are formal USGS classifications. Deposit models with common names are described by text only. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Peralkaline intrusion-related REE deposits". Attribute: Attribute_Label: DpMd_RefID (Dep_Model) Attribute_Definition: Deposit model reference identification: a short citation for the source report that identifies a deposit with an associated deposit model. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Krahulec (2018)". Attribute: Attribute_Label: Ftr_Group (Loc_Pt) Attribute_Definition: Feature group: the group to which a feature belongs, such as mine feature, mineral occurrence, or mineral region. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mine Feature Enumerated_Domain_Value_Definition: A point feature representing a mine, or a location where ore materials are extracted, processed, or concentrated. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mineral Occurrence Enumerated_Domain_Value_Definition: A point feature representing a deposit, prospect, or showing. A location where useful minerals or materials might be concentrated in sufficient quantity to be exploited. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mineral Region Enumerated_Domain_Value_Definition: A point that represents the center of a mineralized area, typically defined by a group of mines or mineral deposits or a geological environment permissive for mineral deposits. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Ftr_ID (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Feature identification: a unique alpha-numeric value assigned to each feature. The ID starts with Mf (mine feature), Mo (mineral occurrence), Mr (mineral region), or Sw (surface workings) followed by a 5-digit number. A "-1111" value indicates that the record pertains to a group of related features. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Mf00001" for a mine feature, "Mo00001" for a mineral occurrence, "Mr00001" for a mineral region, and "Sw00001" for a surface workings. Attribute: Attribute_Label: Ftr_Name (Dep_Model, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Feature name: the current (preferred) name of the mine feature (Mf), mineral occurrence (Mo), or mineral region (Mr). The format for mine features and mineral occurrences is "Site Name, Feature name". Mineral regions have the name of the Site name (Site_Name) listed in the Site table. Surface working polygons in the Loc_Poly_Sw feature class are simply called “Surface Workings”. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Apex, Apex mine" for a mine feature, "Apex, Apex deposit" for a mineral occurrence, "Tutsagubet Mining District" for a mineral region, and "Surface Workings" for a surface workings. Attribute: Attribute_Label: Ftr_Type (GeolMinOcc, Loc_Pt) Attribute_Definition: Feature type: the type of mine feature, mineral occurrence, or mineral region feature. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Adit Enumerated_Domain_Value_Definition: A horizontal passage from the surface into a mine. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Area Enumerated_Domain_Value_Definition: Area of similar geology and deposit types. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Deposit Enumerated_Domain_Value_Definition: A mineral occurrence with grade and size as determined by a reserve, a resource estimate, or by production history. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mining District Enumerated_Domain_Value_Definition: A section of country usually designated by name, having described or understood boundaries within which minerals are found and worked under rules and regulations prescribed by the miners therein. There is no limit to its territorial extent and its boundaries may be changed if vested rights are not thereby interfered with. Enumerated_Domain_Value_Definition_Source: American Geosciences Institute (1997) Attribute: Attribute_Label: GEM_Name (Dep_Model) Attribute_Definition: Geoenvironmental model name: the associated USGS geoenvironmental model. The value "Unclassified" denotes deposits that do not have a defined geoenvironmental model. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Unclassified". Attribute: Attribute_Label: GEM_RefID (Dep_Model) Attribute_Definition: Geoenvironmental model reference identification: the short reference of the source report that provides geoenvironmental descriptions that are associated with a deposit model. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: No values are reported for this field. Attribute: Attribute_Label: GeolMinOcc (Site) Attribute_Definition: Geology mineral occurrence: indicates if information for a site is available in the GeolMinOcc table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the GeolMinOcc table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the GeolMinOcc table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Grade (Production, Resources) Attribute_Definition: Grade: the reported numerical grade of the deposit. When appropriate, Grade values are calculated by USGS authors. These values are denoted by a "111" decimal trailer. No values are reported for the Production table. Grade values range from 0.01 to 1,104.09 in the Resources table with variable units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.01 Range_Domain_Maximum: 1,104.09 Attribute_Units_of_Measure: See Grade_Unit. Attribute: Attribute_Label: Grade_Unit (Production, Resources) Attribute_Definition: Grade unit: the unit of the reported Grade field. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per tonne Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by mass in metric tonnes. Also known as "grams per metric ton". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per million Enumerated_Domain_Value_Definition: The mass of an element or compound (e.g. Nb2O5) per million units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Enumerated_Domain_Value_Definition: The mass of an element or compound per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: GradeSI (Production, Resources) Attribute_Definition: Grade SI: the Grade converted to elemental amount in International System of Units (SI). Calculated values are denoted by a "111" decimal trailer. No values are reported for the Production table. Values in the Resources table range from 0.01 to 1,104.09 with variable SI units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.01 Range_Domain_Maximum: 1,104.09 Attribute_Units_of_Measure: See GradUnitSI. Attribute: Attribute_Label: GradUnitSI (Production, Resources) Attribute_Definition: Grade unit SI: the units of Grade SI (GradeSI). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric ton Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by mass in metric tons. Also known as "grams per tonne". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: kilograms per metric ton Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in kilograms divided by mass in metric tons. Also known as "kilograms per tonnes". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Enumerated_Domain_Value_Definition: The mass of an element or compound per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: History (Site) Attribute_Definition: History: indicates if information for a site is available in the History table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the History table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the History table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Host_Age (GeolMinOcc) Attribute_Definition: Host age: the age of the lithological unit(s) that host, are in direct contact with, or cut across the mineral occurrence. Age is recorded as it was stated in the source document, which may be in the format of millions of years (Mega-annum [Ma]) or chronostratigraphic units. When multiple ages are reported, these are further explained in the Remarks field. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "36.2 Ma" for millions of years, and "Pennsylvanian", for chronostratigraphic units. Attribute: Attribute_Label: Host_Litho (GeolMinOcc) Attribute_Definition: Host lithology: the lithological unit(s) that host, are in direct contact with, or cut across the mineral occurrence. Host lithology are reported as presented in the source document. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "rhyolite". Attribute: Attribute_Label: Host_Name (GeolMinOcc) Attribute_Definition: Host name: the name of the lithological unit(s) that host the mineral occurrence as reported by the source document. Formal names are distinguished from informal names by use of capitalization standards. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Callville Limestone" for formal units, and "Round Top Mountain rhyolite" for informal units. Attribute: Attribute_Label: Last_Updt (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, References, Resources) Attribute_Definition: Last updated: the date that the record in a table was last updated or revised by the USGS authors. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2020-12-08". Attribute: Attribute_Label: Lat_WGS84 (Loc_Pt) Attribute_Definition: Latitude WGS 84: the approximate latitude of the point location provided in the World Geodetic System of 1984 (WGS84) coordinates. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 31.265749 Range_Domain_Maximum: 37.108002 Attribute_Units_of_Measure: decimal degree Attribute: Attribute_Label: Loc_Date (Loc_Poly_Sw, Loc_Pt) Attribute_Definition: Location date: the publication year of the map or figure used to obtain a feature location. The Loc_Date value may differ from the publication date of the source document if the map or figure cites a different year. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2020". Attribute: Attribute_Label: Loc_Poly (Loc_Pt, Site) Attribute_Definition: Location polygon: indicates if a point location has an associated polygon boundary in the Loc_Poly feature class. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: There is a polygon boundary. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: There is no polygon boundary. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Loc_Pt (Site) Attribute_Definition: Location point: indicates if information for a site is available in the Loc_Pt feature class. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: There is a location point. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Loc_Scale (Loc_Pt) Attribute_Definition: Location scale: the scale of the map that the location was captured from. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Small (less than 1:250,000) Enumerated_Domain_Value_Definition: The representative fraction scale of the source map is 1:250,000 or smaller. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Large (greater than 1:24,000) Enumerated_Domain_Value_Definition: The representative fraction scale of the source map is 1:24,000 or larger. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Long_WGS84 (Loc_Pt) Attribute_Definition: Longitude WGS84: the approximate longitude of the point location provided in the World Geodetic System of 1984 (WGS84) coordinates. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -113.876999 Range_Domain_Maximum: -105.445053 Attribute_Units_of_Measure: decimal degree Attribute: Attribute_Label: Mat_Amnt (Production, Resources) Attribute_Definition: Material amount: the reported amount of Material. Calculated values are denoted by a "111" decimal trailer. Negative values indicate the material amount contains multiple commodities. For example, a deposit produces 87 tons of ore containing 7.3 percent copper, 7.4 troy ounces per ton silver, and 0.011 troy ounces per ton gold. Each commodity is listed as a separate record with a negative value of -87 in Mat_Amnt. Values in the Production table range from 400 to 180,000 with variable units. Values in the Resources table range from 50,000 to 735,000,000 with variable units (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 50,000 Range_Domain_Maximum: 735,000,000 Attribute_Units_of_Measure: See Mat_Units. Attribute: Attribute_Label: Mat_Type (Production, Resources) Attribute_Definition: Material type: the type of Material reported by the source document for the mineral occurrence, mine feature, or mineral region. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: commodity Enumerated_Domain_Value_Definition: The final, valuable material that has been processed from the ore material; commonly expressed in sales units such as pounds, tons, troy ounces etc. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ore Enumerated_Domain_Value_Definition: The mixture of valuable and gangue materials. Ore is commonly represented in units of tons, metric tons, cubic yards, etc., and is typically associated with a grade(s) and (or) contained amount of the valuable material(s). Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Mat_Units (Production, Resources) Attribute_Definition: Material units: the units reported by the source document for the Material amount (Mat_Amnt) field. When appropriate these units may be changed by the USGS authors if calculations have been performed with the Mat_Amnt field. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: pounds Enumerated_Domain_Value_Definition: A imperial unit of mass equal to 16 ounces. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "tons". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tonnes Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "metric tons". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces Enumerated_Domain_Value_Definition: A unit for mass that is equal to 31.10348 grams. Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: MatAmntSI (Production, Resources) Attribute_Definition: Material amount SI: the reported amount of Material in International System of Units (SI). Calculated values are denoted by a "111" decimal trailer. Negative values indicate the material amount contains multiple commodities. For example, a deposit produces 87 tons of ore containing 7.3 percent copper, 7.4 troy ounces per ton silver, and 0.011 troy ounces per ton gold. Each commodity is listed as a separate record with a negative value of -79.111 entered in Mat_Amnt. Values in the Production table range from 0.7462 to 7,102 metric tons. Values in the Resources table range from 50,000 to 735,000,000 metric tons (shown below). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 50,000 Range_Domain_Maximum: 735,000,000 Attribute_Units_of_Measure: See MatUnitsSI. Attribute: Attribute_Label: Material (Production, Resources) Attribute_Definition: Material: the Material reported by the source document for either production or resources. The format for this field is "material name (chemical formula)". Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "gallium (Ga)". Attribute: Attribute_Label: MatUnitsSI (Production, Resources) Attribute_Definition: Material units SI: the SI units of the Material amount (Mat_Amnt). Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Min_Age (GeolMinOcc) Attribute_Definition: Mineralization age: the age of mineralization. Age is recorded as it was stated in the source document, which may be in the format of millions of years (Mega-annum [Ma]) or chronostratigraphic units. If multiple ages are reported, they are separated by semicolons and there will be an explanation in the Remarks field for each age. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Tertiary" for chronostratigraphic units. Attribute: Attribute_Label: Min_Style (GeolMinOcc) Attribute_Definition: Mineralization style: how the valuable materials (Value_Mat) occur. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "disseminated". Attribute: Attribute_Label: MinReg_ID (Loc_Pt, Site) Attribute_Definition: Mineral region identification: the unique identification assigned to a mineral region. The format for a mineral region is "Mr" followed by a 5-digit number. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Mr00001". Attribute: Attribute_Label: OBJECTID (All tables) Attribute_Definition: Object identification: an ArcGIS default field that contains an integer value to uniquely identify a row in an attribute table. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 59 Attribute: Attribute_Label: Other_Name (Loc_Pt, Site) Attribute_Definition: Other name: other reported name(s) of the mineral region, mineral occurrence, mine feature, or site. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Dixie mine". Attribute: Attribute_Label: Poly_Def (Loc_Pt) Attribute_Definition: Polygon definition: description of a polygon boundary. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Approximate extent of region on the map". Attribute: Attribute_Label: Production (Site) Attribute_Definition: Production: indicates if production data for a site are available in the Production table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Production table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Production table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Pt_Def (Loc_Pt) Attribute_Definition: Point definition: description of a point location. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Approximate extent of region on the map". Attribute: Attribute_Label: Ref_Detail (Dep_Model, History, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Reference detail: the figure, page, or map, etc. that data originate from. The format of this field is "Page number, Table/Figure number." If the figure, page, map, etc., number are not provided, data are captured in as complete a form as possible to direct the user to the proper location of the data within the source document. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Page 4, Figure 3". Attribute: Attribute_Label: Ref_ID (Descr_Sum, GeolMinOcc, History, Loc_Poly_Sw, Loc_Pt, Production, References, Resources) Attribute_Definition: Reference identification: a shortened reference identification of the source document. The field includes the authors last name(s) and year of publication. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Hulse and others (2019)". Attribute: Attribute_Label: Reference (References) Attribute_Definition: Reference: the full reference of the source report, reported according to the USGS citation format. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Information regarding USGS publishing may be found at https://www.usgs.gov/publishing. Attribute: Attribute_Label: Remarks (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources, Site) Attribute_Definition: Remarks: additional descriptive text or remarks provided by USGS authors. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: Remarks are free-form entry provided by the USGS authors. Attribute: Attribute_Label: Resources (Site) Attribute_Definition: Resources: indicates if information for a site is available in the Resources table. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Resources table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Resources table. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Rsrc_Class (Resources) Attribute_Definition: Resource classification: the classification of the resource record as stated in the source document. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Inferred Enumerated_Domain_Value_Definition: The part of a mineral resource for which tonnage, grade, and mineral content can be estimated with a low level of confidence. It is inferred from geological evidence and assumes, but does not verify, geological and (or) grade continuity. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Measured plus Indicated Enumerated_Domain_Value_Definition: A term used for the sum of measured plus indicated classifications. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Unclassified Enumerated_Domain_Value_Definition: A term used to identify records that do not have publicly available resource classifications available. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Rsrc_Code (Resources) Attribute_Definition: Resource code: the standard classification system used to classify and report the resource estimate. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: CIM Enumerated_Domain_Value_Definition: The CIM (Canadian Institute of Mining, Metallurgy and Petroleum) Definition Standards on Mineral Resources and Reserves (CIM Definition Standards) establish definitions and guidance on the definitions for mineral resources, mineral reserves, and mining studies used in Canada. The Mineral Resource, Mineral Reserve, and Mining Study definitions are incorporated, by reference, into National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101). The CIM Definition Standards can be viewed on the CIM website at www.cim.org. Enumerated_Domain_Value_Definition_Source: Canadian Institute of Mining, Metallurgy and Petroleum (2014) Attribute: Attribute_Label: Rsrc_Date (Resources) Attribute_Definition: Resource date: the 4-digit year of the resource record. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2019". Attribute: Attribute_Label: Rsrc_Descr (Resources) Attribute_Definition: Resource description: the resource classification category, such as resources or reserves. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Resources Enumerated_Domain_Value_Definition: A concentration of naturally occurring solid, liquid, or gaseous material in or on the Earth's crust in such form and amount that economic extraction of a commodity from the concentration is currently or potentially feasible. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Unclassified Enumerated_Domain_Value_Definition: A term used to identify records that do not have resource descriptions publicly available. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute: Attribute_Label: Shape (Loc_Poly, Loc_Poly_Sw, Loc_Pt) Attribute_Definition: Shape: an ArcGIS default field that contains the geometry type (point, line, polygon). Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Point Enumerated_Domain_Value_Definition: Geometry type is a point. Enumerated_Domain_Value_Definition_Source: Esri (2020) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Polygon Enumerated_Domain_Value_Definition: Geometry type is a polygon. Enumerated_Domain_Value_Definition_Source: Esri (2020) Attribute: Attribute_Label: Shape_Area (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Shape area: an ArcGIS default field that contains the area of a polygon. The value is automatically generated in units of the feature class. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.000002 Range_Domain_Maximum: 0.01936 Attribute_Units_of_Measure: degree Attribute: Attribute_Label: Shape_Length (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Shape length: an ArcGIS default field that contains the length of a line or perimeter. The value is automatically generated in the units of the feature class. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.009422 Range_Domain_Maximum: 0.515254 Attribute_Units_of_Measure: degree Attribute: Attribute_Label: Site_ID (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Pt, Production, Resources, Site) Attribute_Definition: Site identification: the unique alpha-numeric identification assigned to a site. The format for this field is a two-letter state abbreviation followed by a 5-digit number. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "AK00001". Attribute: Attribute_Label: Site_Name (Site) Attribute_Definition: Site name: the name that best represents the grouping of mine and/or mineral occurrence features, or mineral regions of an area. Site names often take on the primary name of the deposit or mine that the site was created for. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Apex". Attribute: Attribute_Label: StatDetail (History) Attribute_Definition: Status detail: a description of the activity that occurred during a specified time period, as shown in the Year from (Year_From) and Year to (Year_To) fields. The StatDetail describes the Status field value. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Copper was discovered in 1872". Attribute: Attribute_Label: State (Loc_Poly_Sw, Loc_Pt) Attribute_Definition: State: the U.S. state name using 2-letter abbreviations. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "UT". Attribute: Attribute_Label: Status (History) Attribute_Definition: Status: the type of activity that took place during a specified time period, as shown in the Year from (Year_From) and Year to (Year_To) fields. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Active Enumerated_Domain_Value_Definition: Indicates a mine is in full-time or intermittent production or is selling from stockpiles. Enumerated_Domain_Value_Definition_Source: USGS authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Discovery Enumerated_Domain_Value_Definition: The actual finding of a valuable mineral, indicative of a deposit. Legally, a discovery is a prerequisite to making a mining claim on an area. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Evaluation Enumerated_Domain_Value_Definition: The fixing of an evaluation, not an appraisal. Used in preference of the word valuation, which is often confused with appraisal. Enumerated_Domain_Value_Definition_Source: American Geosciences Institute (1997) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Exploration Enumerated_Domain_Value_Definition: The search for deposits of useful minerals or fossil fuels. It may include geologic reconnaissance, e.g. remote sensing, photogeology, geophysical and geochemical methods, and both surface and underground investigations. Establishing the nature of a known mineral deposit, preparatory to development. In the sense that exploration goes beyond discovery, it is a broader term than prospecting. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute: Attribute_Label: Value_Mat (GeolMinOcc) Attribute_Definition: Valuable material: the minerals or rocks that are the material(s) that comprise the valuable constituent(s) of a deposit. These material(s) are reported as they are presented in the source document. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "adamite; anglesite; aurichalcite; azurite; brochantite; cerussite; chalcopyrite; chrysocolla; conichalcite; covellite; cuprite; galena; goethite; hematite; hydrozincite; jarosite; limonite; malachite; native copper; rosasite; sphalerite". Attribute: Attribute_Label: Year_From (History, Production) Attribute_Definition: Year from: the initial year for a history or production record. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "1884". Attribute: Attribute_Label: Year_To (History, Production) Attribute_Definition: Year to: the last year for a history or production record. Attribute_Definition_Source: USGS authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "1986". Overview_Description: Entity_and_Attribute_Overview: The entity and attribute information provide the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set. Entity_and_Attribute_Detail_Citation: The entity and attribute information are generated by the individual and (or) agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. 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San Juan Contact_Organization: U.S. Geological Survey Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: PO Box 25046, Mail Stop 973 City: Lakewood State_or_Province: CO Postal_Code: 80225 Country: US Contact_Voice_Telephone: 303-236-2450 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: csanjuan@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998