Lithium Deposits in the United States

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Karl, N.A.
Originator: Mauk, J.L.
Originator: Reyes, T.A.
Originator: Scott, P.C.
Publication_Date: 20190805
Title: Lithium Deposits in the United States
Geospatial_Data_Presentation_Form: Vector Digital Data Set
Publication_Information:
Publication_Place: Denver, CO
Publisher: USGS ScienceBase
Online_Linkage: https://doi.org/10.5066/P9ZKRWQF
Description:
Abstract:
This data release provides the descriptions of approximately 20 U.S. sites that include mineral regions, mines, and mineral occurrences (deposits and prospects) that contain enrichments of lithium (Li). This release includes sites that have a contained resource and (or) past production of lithium metal greater than 15,000 metric tons. Sites in this database occur in Arkansas, California, Nevada, North Carolina, and Utah. There are several deposits that were not included in the database because they did not meet the cutoff requirement, and those occur in Arizona, Colorado, the New England area, New Mexico, South Dakota, and Wyoming.

In the United States, lithium was first mined from pegmatite orebodies in South Dakota in the late 1800s. The Kings Mountain pegmatite belt of North Carolina also had significant production from pegmatites, and the area may still contain as much as 750 million metric tons (Mt) of ore containing 5 Mt lithium metal (Kesler and others, 2012). In 2018, U.S. production of lithium was restricted to a single lithium-brine mining operation in Nevada. In 2018, the U.S. had a net import reliance as a percentage of apparent consumption of more than 50 percent for lithium (U.S. Geological Survey, 2019). The U.S. is not a significant producer of lithium, so the commodity is mainly imported from Chile and Argentina to meet consumer demand.

Lithium is necessary for strategic, consumer, and commercial applications. The primary uses for lithium are in batteries, ceramics, glass, metallurgy, pharmaceuticals, and polymers (U.S. Geological Survey, 2019). Lithium has excellent electrical conductivity and low density (lithium metal will float on water), making it an ideal component for battery manufacturing. Lithium is traded in three primary forms: mineral concentrates, mineral compounds (from brines), and refined metal (electrolysis from lithium chloride). Lithium mineralogy is diverse; it occurs in a variety of pegmatite minerals such as spodumene, lepidolite, amblygonite, and in the clay mineral hectorite. Current global production of lithium is dominated by pegmatite and closed-basin brine deposits, but there are significant resources in lithium-bearing clay minerals, oilfield brines, and geothermal brines (Bradley and others, 2017).

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) or the Joint Ore Reserves Committee Code (JORC Code). The inclusion of a particular lithium 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 larger lithium deposits in the United States, which are diverse in their geology and resource potential. 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.

Bradley, D.C., Stillings, L.L., Jaskula, B.W., Munk, LeeAnn, and McCauley, A.D., 2017, Lithium, chap. K 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. K1–K21, https://doi.org/10.3133/pp1802K.

Kesler, S.E., Gruber, P.W., Medina, P.A., Keoleian, G.A., Everson, M.P., and Wallington, T.J., 2012, Global lithium resources—relative importance of pegmatite, brine and other deposits: Ore Geology Reviews, v. 48, October ed., p. 55—69.

U.S. Geological Survey, 2019, Mineral commodity summaries 2019: U.S. Geological Survey, 200 p., https://doi.org/10.3133/70202434.
Purpose:
This dataset is part of an ongoing effort by the U.S. Geological Survey (USGS) to understand the attributes and geologic distribution of critical mineral resources, especially those in the United States. The United States continues to become more dependent on imports to meet the domestic demands for an increasing number of mineral commodities. Many mineral commodities are now produced primarily or entirely outside of the United States, creating the potential for supply interruptions in the foreseeable future or in the long term. These important but highly dependent mineral commodities are deemed critical and (or) strategic resources.

As a part of the process set forth by Executive Order 13817, the USGS National Minerals Information Center (NMIC) identified lithium as a critical mineral (Department of the Interior, 2018) due to the import reliance and importance in the sectors of aerospace, defense, energy, telecommunications and electronics and transportation (Fortier and others, 2018). Lithium is mined from brines and pegmatites and is typically the primary commodity, though does occur as a byproduct in some operations such as borate deposits.

This dataset was compiled to provide base layers of information that identify and describe the known lithium deposits in the United States. This compilation is intended to contribute to our geologic understanding of lithium deposits in the United States, and to assist in evaluating their resource potential.

Department of the Interior, 2018, Final list of critical minerals 2018: Federal Register v. 83, no. 97, p. 23295—23296, https://www.federalregister.gov/d/2018-10667.

Fortier, S.M., Nassar, N.T., Lederer, G.W., Brainard, Jamie, Gambogi, Joseph, and McCullough, E.A., 2018, Draft critical mineral list—Summary of methodology and background information—U.S. Geological Survey technical input document in response to Secretarial Order No. 3359: U.S. Geological Survey Open-File Report 2018–1021, 15 p., https://doi.org/10.3133/ofr20181021.
Supplemental_Information:
The Esri ArcGIS 10.7 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.

DATABASE LAYERS AND TABLES

The Loc_Pt feature class contains point locations of mines, mineral occurrences (deposits and prospects), and mineral regions, 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 a point location, except for surface workings.

The Loc_Poly feature class contains footprints or polygons of deposits, geothermal reservoirs, mineral districts, 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 layer (see Loc_Poly_Sw).

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 (300 meters) in one dimension to be digitized, and multiple workings that are 500 feet (150 meters) 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.

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. The Site_ID is used in all tables except the References table. 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.

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 “spodumene”, and another reports "lepidolite", 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, Kesler (1976). 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.

The Resources table contains reported resource and reserve information for mineral deposits. Initial (or earliest resource data found by USGS authors) and current resource data were compiled, even if information from intervening years was reported. 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 National Instrument 43-101 (NI 43-101) or the Joint Ore Reserves Committee Code (JORC Code). Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. If resources or reserves are reported for a group of features rather than an individual deposit, the Ftr_ID will show “-1111” and the resource or reserve is assigned to the “site” or Site_ID that groups those deposits in 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 which is typically calculated value by USGS authors. A value ending with “111” as a decimal trailer indicates the value was calculated by USGS authors. Conversion factors used by USGS authors can be found on the USGS_Lithium_US_Merged_Excels file under the Conversions tab. 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. 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.

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 values. 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 in 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 which is typically calculated value by USGS authors. A value ending with “111” as a decimal trailer indicates the value was calculated by USGS authors. Conversion factors used by USGS authors can be found on the USGS_Lithium_US_Merged_Excels file under the Conversions tab. 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. 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 International System of Units (SI units) by the USGS authors.

The History table contains information derived from publicly available sources regarding the status of a mine, prospect, deposit, or mineral region 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 1936 and 1979, respectively, then the mine was active from 1936 to 1979; it is unknown if the mine is still active. The Last_Updt field shows the date that the record was last updated by the USGS authors.

The Dep_Model table contains mineral deposit model and geoenvironmental model classifications 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 References table contains the citation of the map or report(s) from which the point, polygon, or attribute information was obtained. The table also assigns a short reference, Ref_ID that is used throughout the database.

GENERAL INFORMATION

Mines are a man-made feature associated with the process of extracting, processing, or concentrating ore materials. In this database, mines 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 like pits, dumps, tailings, etc. within the surface workings outline.

Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, are attributed as deposits or prospects in the USGS Mineral Deposit Database (USMIN). Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate. Prospects have sufficient data to describe at least two dimensions and has the presence of useful or valuable minerals or materials.

Mineral regions are attributed as geothermal reservoirs, mineral districts, or mining districts. Geothermal reservoirs are an underground storage of water trapped in porous rock capable of providing hydrothermal resources. Mineral districts are areas, usually designated by name, 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. Mineral region polygons may overlap.

The locations of mine features, mineral occurrences, and mineral regions 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 point layer. Otherwise, for points that have polygonal boundaries, the Loc_Pt feature class attribute field Loc_Poly contains the value “Yes” and the type of boundary is described in the Poly_Def field. For example, “Approximate extent of lithium lens on map”, “Extent of indicated mineral resource shown on map”, or “Mining district boundary”.

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 summarizing 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 database information is derived from publicly available sources. The Last_Updt field shows the date that the record information was last updated by the 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. With the exception of the Loc_Poly feature class the primary reference(s) is typically noted in the Ref_ID field. Additional references are enumerated after attribute field values, and the corresponding short reference is in the Remarks field. For example, the Commodity field shows “lithium; potassium (1); sodium (1); fluorine (1)”. This indicates the commodity “lithium” was derived from the primary reference denoted in the Ref_ID field as “Henry and others (2017)” and “potassium, sodium, and fluorine” were derived from a secondary reference denoted in the Remarks field as “(1) Rossi (2010)”.

There is no relevance to the order of data presented in lists. For example, if the Commodity field shows “lithium; boron; potassium”, that is the order in which those commodities were compiled by the authors and does not represent the order of importance. Additionally, in the GeolMinOcc table, lists in different fields do not relate. For example, if the Commodity field shows “lithium; boron; potassium”, the Value_Mat field may list related ore minerals in a different order. Similarly, the data lists reflect the order in which the information was compiled. Fields with lists 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.

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. 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.

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 the attribute field Mat_Amnt (material amount) occurs in the Production table and in the Resources table.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1918
Ending_Date: 2019
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -118.168460
East_Bounding_Coordinate: -81.222730
North_Bounding_Coordinate: 42.081973
South_Bounding_Coordinate: 32.625363
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: mineral deposits
Theme_Keyword: metallic mineral resources
Theme_Keyword: mineral resources
Theme_Keyword: economic geology
Theme_Keyword: geospatial datasets
Theme_Keyword: natural resource exploration
Theme_Keyword: geographic information systems
Theme_Keyword: lithium
Theme_Keyword: boron
Theme_Keyword: potassium
Theme_Keyword: sodium
Theme_Keyword: fluorine
Theme_Keyword: tungsten
Theme_Keyword: bromine
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Department of the Interior (DOI)
Theme_Keyword: U.S. Geological Survey (USGS)
Theme_Keyword: Bureau of Land Management (BLM)
Theme_Keyword: Mineral Resources Program (MRP)
Theme_Keyword: Geology, Geophysics, and Geochemistry Science Center (GGGSC)
Theme_Keyword: USGS Mineral Deposit Database (USMIN)
Theme_Keyword: Earth Mapping Resources Initiative (Earth MRI)
Theme_Keyword: data release
Theme_Keyword: critical mineral
Theme_Keyword: deposit type
Theme_Keyword: closed-basin brine
Theme_Keyword: evaporites
Theme_Keyword: lithium-bearing clay
Theme_Keyword: lithium-cesium-tantalum (LCT) pegmatite
Theme_Keyword: lithium-enriched oilfield brine
Theme_Keyword: mineral occurrence
Theme_Keyword: mineral region
Theme_Keyword: mine feature
Theme_Keyword: geothermal reservoir
Theme_Keyword: mineral district
Theme_Keyword: mining district
Theme_Keyword: open pit mine
Theme_Keyword: prospect
Theme_Keyword: brine
Theme_Keyword: commodity
Theme_Keyword: ore
Theme_Keyword: well
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: United States
Place:
Place_Keyword_Thesaurus: Common geographic areas
Place_Keyword: Arkansas
Place_Keyword: California
Place_Keyword: Nevada
Place_Keyword: North Carolina
Place_Keyword: Utah
Access_Constraints: None. Please see 'Distribution Information' 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, Southwest Region
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: United States
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 Stuart Giles and Lisa Stillings.
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft [Unknown] Version 6.2 (Build 9200); Esri ArcGIS 10.7.0 (Build 10450) Service Pack N/A (Build N/A)
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Unique values in attribute fields were checked through frequency analyses. The unique values in each attribute field were reviewed and checked for spelling, consistency of terms, accuracy, adherence to established vocabularies, and completeness. Values calculated by USGS authors were reviewed and verified. Further information regarding calculations can be obtained from USGS authors. Floating-point numerical values may be reported to 8 decimal places. Default setting in the ArcGIS geodatabase which typically show 6 decimal places, may be formatted to show the full numerical value.

When converting from an ArcGIS file geodatabase attribute table to Excel, precision of numeric values may change. The values from the ArcGIS file geodatabase are accurate and should be used for any calculations or analyses.
Logical_Consistency_Report:
The locations of mine features, mineral occurrences (deposits and prospects), and mineral regions 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:
Mine feature, mineral occurrence, and mineral region geospatial and attribute data were compiled for the United States. Data were limited to publicly available sources for the time period between 1918 and 2019. 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 were 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 were 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 was 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: Canadian Institute of Mining, Metallurgy and Petroleum
Publication_Date: 2014
Title:
CIM Definition Standards for Mineral Resources and Mineral Reserves
Geospatial_Data_Presentation_Form: Other
Publication_Information:
Publication_Place: CIM Website
Publisher: Canadian Institute of Mining, Metallurgy and Petroleum
Online_Linkage: http://web.cim.org/standards/MenuPage.cfm?sections=177&menu=178
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: CIM (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 CIM (2014) in this metadata.
Source_Information:
Source_Citation:
Citation_Information:
Originator: American Geological Institute
Publication_Date: 1997
Title:
Dictionary of Mining, Mineral, and Related Terms, Second Edition
Geospatial_Data_Presentation_Form: Publication (Book)
Publication_Information:
Publication_Place: Virginia
Publisher: American Geological Institute
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: AGI (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 AGI (1997) in this metadata.
Source_Information:
Source_Citation:
Citation_Information:
Originator: American Geological Institute
Publication_Date: 2011
Title: Glossary of Geology, Fifth Edition, Revised
Geospatial_Data_Presentation_Form: Publication (Book)
Publication_Information:
Publication_Place: Virginia
Publisher: American Geological Institute
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: AGI (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 AGI (2011) in this metadata.
Process_Step:
Process_Description:
A literature search of publicly available mineral resource information was conducted for lithium element occurrences 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 active mines, mineral occurrences, mineral regions, and resource and production data. Relevant information was acquired, reviewed for quality and geospatial information, and prioritized for digital data capture.

Mines described in published reports were captured as point locations and attributed to show mining activity in the History table and mine production in the Production table. Where possible, the approximate extent of the mining operation area was captured from imagery and presented in the surface workings layer (see Loc_Poly_Sw). Surface workings were digitized if the ground disturbance was at least 1,000 feet (300 meters) in one dimension. The outlines of adjacent surface workings were merged if they were within 500 feet (150 meters) of one another.

Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, were compiled and attributed as deposits and prospects. Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate; prospects have sufficient data to describe at least two dimensions and has the presence of useful or valuable minerals or materials. Mineral occurrences were represented as points and as polygons if the aerial extent or “footprint” of a deposit or prospect 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 was compiled as reported and consequently shows variable units. USGS authors make every attempt to provide material amount, grade, and contained commodity data. If two of the three values are reported, the missing value is calculated by the USGS authors. These calculated values are denoted by “111” as a decimal trailer. For consistency, the three fields are converted to SI units by the USGS authors, and contained commodity 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.

In some instances, the cutoff grade of the primary commodity determines the cutoff grade of coproducts. For example, the Fort Cady brine deposit in California has a reported cutoff grade of 5 percent B2O3. The cutoff grade for all commodities is reported as “5 percent B2O3”.

In some instances, the reported commodity is a compound. When this occurs, the commodity is converted to its elemental form and the converted amount is stated in SI units. For example, the commodity lithium carbonate (Li2CO3) is reported in the Material field. The USGS authors convert the reported quantity of Li2CO3 to the elemental form Li in SI units and populate the fields CntSIComAm and CntSIComUt accordingly.

Mineral regions were digitized as shown in the source reports, and thus may be represented as points or polygons. Mineral regions are attributed as geothermal reservoirs, mineral districts, or mining districts. Geothermal reservoirs are an underground storage of water trapped in porous rock capable of providing hydrothermal resources. Mineral districts are areas, usually designated by name, 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. Mineral region polygons may overlap.

All data were spatially integrated using ArcGIS. All attribute data were compiled from publicly available sources published between 1918 and 2019. Standardized vocabularies were developed by USGS authors and include definitions from CIM (2014), AGI (1997), and AGI (2011). Data were checked throughout the compilation process for accuracy of locations; and completeness, accuracy, and consistency of attributes.
Process_Date: 2019
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: 61
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 34
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0000001
Longitude_Resolution: 0.0000001
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:
Fields containing attribute information associated with the data set. Attribute fields occur in data layer(s) noted in parentheses.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Alteration (GeolMinOcc)
Attribute_Definition:
Alteration associated with the mineralization in the mineral occurrence.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "hydrothermal", or "thin zones of metasomatism in host rocks and contacts with pegmatites", etc.
Attribute:
Attribute_Label: Approx_Lat (Site)
Attribute_Definition:
Approximate latitude (WGS 84) of the approximate center of the site area.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.1686
Range_Domain_Maximum: 41.903853
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Approx_Lon (Site)
Attribute_Definition:
Approximate longitude (WGS 84) of the approximate center of the site area.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -118.117056
Range_Domain_Maximum: -81.288113
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Assoc_Dep (Production)
Attribute_Definition:
Deposit(s) associated with the production. These values are represented by Ftr_ID(s) for deposits (mineral occurrence [Mo]) from which production occurred.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "Mo00567", "Mo00568", or "Mo00593", etc.
Attribute:
Attribute_Label: Assoc_Mat (GeolMinOcc)
Attribute_Definition:
Associated materials occurring with the valuable material (minerals or rocks) but are not considered ore or valuable. Same as gangue for metallic mineral deposits.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "calcite", "dolomite", or "smectite", etc.
Attribute:
Attribute_Label: CntSICom (Production, Resources)
Attribute_Definition:
The contained commodity reported by the source, converted to elemental form where appropriate. If the commodity occurs as a compound, USGS authors convert the compound to its elemental form. For example, if the commodity occurs as lithium carbonate (Li2CO3), elemental Li is calculated and reported. The quantity of CntSICom is reported in the CntSIComAm field, and the associated units are reported in the CntSIComUt field. The conversion factors used for these calculations can be found on the Conversions tab of the USGS_Lithium_US_Merged_Excels file.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "B", "Li", or "W", etc.
Attribute:
Attribute_Label: CntSIComAm (Production, Resources)
Attribute_Definition:
Contained commodity amount as reported by the source, converted to the International System of Units (SI units). The minimum and maximum values listed below are from the CntSIComAm field in the Resource table. The values in the Production table range from 16 – 254,000 with variable units. When appropriate CntSIComAm values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 18,100
Range_Domain_Maximum: 5,370,000
Attribute_Units_of_Measure: See CntSIComUt.
Attribute:
Attribute_Label: CntSIComUt (Production, Resources)
Attribute_Definition:
The unit of the contained commodity amount as reported by the source, converted to the International System of Units (SI units). When appropriate contained commodity amounts are calculated to metric tons by USGS authors. These units apply to values listed in the CntSIComAm field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values are limited to metric tons.
Attribute:
Attribute_Label: COG_SI (Production, Resources)
Attribute_Definition:
Cut-off grade (CutOffGrad) reported by the source, converted to International System of Units (SI). The minimum and maximum values listed below are from the COG_SI field in the Resources table. No cut-off grade information was available for production values. Cut-off grade units vary by commodity and deposit, and are listed in the field COU_SI. When appropriate COG_SI values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 5,000
Attribute_Units_of_Measure: See COU_SI.
Attribute:
Attribute_Label: Commodity (GeolMinOcc, Loc_Pt, Site)
Attribute_Definition:
Commodity(s) present or associated with the feature (mineral occurrence [Mo], mine feature [Mf], or mineral region [Mr]).
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "lithium", "bromine", or "sodium", etc.
Attribute:
Attribute_Label: Cont_Units (Production, Resources)
Attribute_Definition:
The units of weight as reported by the source report for the contained commodity (Contained) field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "kilograms", "metric tons", or "short tons", etc.
Attribute:
Attribute_Label: Contained (Production, Resources)
Attribute_Definition:
The amount of contained commodity present in the ore. The minimum and maximum values listed below are from the Contained field in the Resource table. The values in the Production table range from 150 – 254,000 with variable units. When appropriate Contained values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 18,100
Range_Domain_Maximum: 962,962,000
Attribute_Units_of_Measure: See Cont_Units.
Attribute:
Attribute_Label: COU_SI (Production, Resources)
Attribute_Definition:
Reported resource or production cutoff grade units (CutOffUnit) converted to International System of Units (SI). No values were available for the Production table for this field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "milligrams per liter", "parts per million Li", or "percent B2O3", etc.
Attribute:
Attribute_Label: County (Loc_Pt, Loc_Poly_Sw)
Attribute_Definition:
Name of the U.S. county where the feature is located. If the mine, mineral occurrence, or mineral region occurs in multiple counties, all county names are listed, separated by semicolons.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Box Elder", "Cleveland", or "Lafayette; Columbia; Ouachita; Union", etc.
Attribute:
Attribute_Label: CutOffGrad (Production, Resources)
Attribute_Definition:
Reported resource or production cutoff grade. The minimum and maximum values listed below are for the CutOffGrad field in the Resources table with variable units. No cut-off grade information was available for production values. When appropriate CutOffGrad values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 5,000
Attribute_Units_of_Measure: See CutOffUnit.
Attribute:
Attribute_Label: CutOffUnit (Production, Resources)
Attribute_Definition:
The units reported by the source report for the cutoff grade (CutOffGrad) field. No values were available for the Production table for this field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "milligrams per liter Li", "parts per million Li", or "percent B2O3", etc.
Attribute:
Attribute_Label: Dep_Model (Site)
Attribute_Definition:
Indicates whether the deposit(s) on the site has been classified in the Dep_Model table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Descr (Descr_Sum)
Attribute_Definition:
Provides a detailed description of a feature identified by the Ftr_ID or Site_ID. Description reported in quotations ("") by the source reference. These data are supplementary text intended to expand on the descriptions of features that the database structure would not otherwise allow.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Bonnie Claire appears to be a new type of deposit...", "Lithium occurs in the Salton Sea KGRA fluids...", or "Searles Lake is underlain by 693 m of saline mineral layers", etc.
Attribute:
Attribute_Label: Descr_Sum (Site)
Attribute_Definition:
Indicates whether descriptions have been captured for the site in the Descr_Sum table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Descr_Type (Descr_Sum)
Attribute_Definition:
Indicates the table or feature class the Descr field is associated to.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Deposit Model", "Geology", or "Production", etc.
Attribute:
Attribute_Label: DpMd_NoNm (Dep_Model)
Attribute_Definition:
This is the deposit model classification assigned to the deposit, noted by a deposit model number and (or) name. When a numbered deposit precedes a deposit name, this indicates the DpMd_NoNm is a USGS classified deposit model. When a deposit model is described in text, this is the common name for the deposit model, but may not be the officially recognized USGS classified name.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "251.30(T) - lithium in smectites of closed basins", "closed-basin brine", or "geothermal brine", etc.
Attribute:
Attribute_Label: DpMd_RefID (Dep_Model)
Attribute_Definition:
The deposit model classification short reference, or Ref_ID, of the source report that provides geologic descriptions that help classify the mineral deposit model.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "American Pacific Borate and Lithium Ltd. (2017)", "Bradley and others (2017)", or "Cowie (1985)", etc.
Attribute:
Attribute_Label: Ftr_Group (Loc_Pt)
Attribute_Definition:
A 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 man-made entity associated with the process of extracting, processing, or concentrating ore materials.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mineral Occurrence
Enumerated_Domain_Value_Definition:
Concentration of useful minerals or materials in sufficient quantity that it has been (or might be) exploited.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mineral Region
Enumerated_Domain_Value_Definition:
An area defined by a grouping 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:
An identification assigned to a feature. A “-1111” value indicates that the record pertains to a group of related features. These features will have the same Site_ID but differing Ftr_IDs. The format of the identification pertains to the type of feature followed by a number. The format is Mo (mineral occurrences), Mr (mineral regions), or Mf (mine features) followed by a 5-digit number, for example, “Mo00001”.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "Mo00567", "Mf00291", or "Sw00128", etc.
Attribute:
Attribute_Label:
Ftr_Name (Dep_Model, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources).
Attribute_Definition:
The current (preferred) form of the name of the mine, mineral occurrence, or mineral region. The syntax of the Ftr_Name is "Site name, Feature name". If the feature name is informal, it will be followed by "deposit" for a mineral occurrence or "mine" for a mine feature.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Bessemer City, Bessemer City deposit", "Bonnie Claire, Bonnie Claire deposit", or "Clayton Valley South, Clayton Valley South deposit", etc.
Attribute:
Attribute_Label: Ftr_Type (GeolMinOcc, Loc_Pt)
Attribute_Definition: Type of mine, mineral occurrence, or mineral region feature.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Brine Mine
Enumerated_Domain_Value_Definition:
The extraction of valuable materials through a well from which brine is pumped to the surface.
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, or a resource estimate, or by production history.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Geothermal Reservoir
Enumerated_Domain_Value_Definition:
Underground storage of water trapped in porous rock capable of providing hydrothermal resources.
Enumerated_Domain_Value_Definition_Source: AGI (2011)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mineral District
Enumerated_Domain_Value_Definition:
An area, usually designated by name, defined by a group of deposits of similar type, origin, or commodity.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mining District
Enumerated_Domain_Value_Definition:
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.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Open Pit Mine
Enumerated_Domain_Value_Definition:
Surficial mine, in which the valuable rock is exposed by removal of overburden.
Enumerated_Domain_Value_Definition_Source: AGI (2011)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Prospect
Enumerated_Domain_Value_Definition:
A mineral occurrence that has at least two dimensions (area) and evidence that useful minerals or materials are present, as indicated by analyses or the presence of valuable minerals.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Well
Enumerated_Domain_Value_Definition:
An artificial excavation, generally cylindrical in form and often walled in, sunk into the ground to such a depth as to penetrate water-yielding rock or soil and to allow the water to flow or to be pumped to the surface.
Enumerated_Domain_Value_Definition_Source: AGI (2011)
Attribute:
Attribute_Label: GEM_Name (Dep_Model)
Attribute_Definition:
Associated geoenvironmental model(s). The value "unclassified" is attributed to deposit models for this field which do not have an associated geoenvironmental model defined. Geoenvironmental models are derived from the deposit model classifying the deposit.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values are limited to "unclassified" within the lithium database.
Attribute:
Attribute_Label: GEM_RefID (Dep_Model)
Attribute_Definition:
The geoenvironmental model classification reference. Short reference, similar to the Ref_ID field in other tables and feature classes, of the source report that contains the information used to select the appropriate geoenvironmental model for a mineral occurrence. There are no values recorded for this attribute in the table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values are limited to "Null" within the lithium database.
Attribute:
Attribute_Label: GeolMinOcc (Site)
Attribute_Definition:
Indicates whether data have been captured in the GeolMinOcc table for the mineral occurrence(s) on the site.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Grade (Production, Resources)
Attribute_Definition:
The reported numerical grade of the deposit. The minimum and maximum values listed below are from the Grade field in the Resources table with variable units. The values in the Production table range from 1.5 – 5,070 with variable units. When appropriate Grade values are calculated by USGS authors. These values are denoted by a '111' decimal trailer. Where the grade is reported as a range in values, the average of the range is listed within the field and the reported range is noted in the Remarks field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.005
Range_Domain_Maximum: 3,283
Attribute_Units_of_Measure: See Grade_Unit.
Attribute:
Attribute_Label: Grade_Unit (Production, Resources)
Attribute_Definition: The units of the reported numerical grade.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "milligrams per liter", "parts per million", and "percent", etc.
Attribute:
Attribute_Label: GradeSI (Production, Resources)
Attribute_Definition:
The reported numerical grade (Grade) converted to International System of Units (SI). The minimum and maximum values listed below are from the GradeSI field in the Resources table. The values in the Production table range from 1.5 – 5,070 with variable units. When appropriate GradeSI values are calculated by USGS authors. These values are denoted by a '111' decimal trailer. Where the grade is reported as a range in values, the average of the range is listed within the field and the reported range is noted in the Remarks field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.005
Range_Domain_Maximum: 3,283
Attribute_Units_of_Measure: See GradUnitSI.
Attribute:
Attribute_Label: GradUnitSI (Production, Resources)
Attribute_Definition:
The units of the reported grade (Grade_Unit) converted to International System of Units (SI).
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "milligrams per liter", "parts per million", and "percent", etc.
Attribute:
Attribute_Label: History (Site)
Attribute_Definition:
Indicates whether history data for the site have been captured in the History table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Host_Age (GeolMinOcc)
Attribute_Definition:
The age of the Host_Litho unit(s) that are in direct contact with, or cut across the mineral occurrence. Age is recorded as it was stated in the source report, this age may be reported as millions of years (Mega-annum [Ma]) or chronostratigraphic units.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "16.39 Ma", "Holocene", or "Jurassic-Oxfordian", etc.
Attribute:
Attribute_Label: Host_Litho (GeolMinOcc)
Attribute_Definition:
The lithological unit(s) that host, that are in direct contact with, or cut across the mineral occurrence. Multiple host lithologies may be present, where unique values are separated by semicolons.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "coarse-grained granite and pegmatite", "coarse-grained biotite-muscovite", or "arkosic sandstone", etc.
Attribute:
Attribute_Label: Host_Name (GeolMinOcc)
Attribute_Definition:
The formal name of the lithological units that host the mineral occurrence as reported by the source report. Descriptive text, not abbreviated.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Esmeralda Formation", "McDermitt Tuff", or "Palm Spring Formation", etc.
Attribute:
Attribute_Label:
Last_Updt (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, References, Resources)
Attribute_Definition:
The date that the record was last updated or revised by the USGS authors. Format is YYYY-MM-DD.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "2018-11-06", "2018-11-19", or "2019-04-18", etc.
Attribute:
Attribute_Label: Lat_WGS84 (Loc_Pt)
Attribute_Definition: Latitude of the point location in decimal degrees (WGS 84).
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.07324
Range_Domain_Maximum: 41.91975
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Loc_Date (Loc_Poly_Sw, Loc_Pt)
Attribute_Definition:
The publication year of the map or figure used to obtain the feature location. The year may differ from the publication date of the reference (identified by the Ref_ID). For example, the explanation for a location figure in a report states “Map from 2002”. The reference was published in 2003. In this case, “2002” is recorded in Loc_Date.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "1918", "1976", or "1973", etc.
Attribute:
Attribute_Label: Loc_Poly (Loc_Pt, Site)
Attribute_Definition:
Indicates whether a polygon location(s) has been digitized for a corresponding point location.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Loc_Pt (Site)
Attribute_Definition:
Indicates whether the point location(s) has been captured for features in the site.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Loc_Scale (Loc_Pt)
Attribute_Definition:
Defines the accuracy of the location as Large, Medium, or Small depending on 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: Medium (1:24,000-1:250,000)
Enumerated_Domain_Value_Definition:
The representative fraction scale of the source map is between 1:24,000 and 1:250,000.
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 of the point location in decimal degrees (WGS 84).
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -118.134605
Range_Domain_Maximum: -81.288113
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Mat_Amnt (Production, Resources)
Attribute_Definition:
The reported amount of the material. The minimum and maximum values listed below are from the Mat_Amnt field in the Resources table with variable units. The values in the Production table range from 450 – 315,066,972 with variable units. Negative number values indicate that the amount value is listed for multiple commodity forms. For example, if the source says that there were 47,000,000 metric tons of ore containing 1.43 percent sodium, 0.58 percent fluorine, 3.83 percent potassium, and 0.26 percent lithium, -47,000,000 would be entered in Mat_Amnt for each record (table row). When appropriate Mat_Amnt values are calculated by USGS authors. These values are denoted by a '111' decimal trailer. Where the material amount is reported as a range in values, the average of the range is listed within the field and the reported range is noted in the Remarks field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 31,600
Range_Domain_Maximum: 9,500,000,000
Attribute_Units_of_Measure: See Mat_Units.
Attribute:
Attribute_Label: Mat_Type (Production, Resources)
Attribute_Definition:
Type of material in the resource or reserve estimate, or type of material produced from the mine.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: brine
Enumerated_Domain_Value_Definition:
A term used for pore fluids in deep sedimentary basins, stratified hot fluids in restricted basins, oil-field waters, and geothermal mineralizing fluids. It denotes warm to hot highly saline waters containing Ca, Na, K, Cl, and minor amounts of other elements.
Enumerated_Domain_Value_Definition_Source: AGI (2011)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: commodity
Enumerated_Domain_Value_Definition:
The final, valuable material that has been processed out of the ore material. The commodity is commonly represented in the source documentation as contained commodity in units such as ounces, pounds, metric tons, 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 materials along with gangue rocks and minerals. Ore is commonly represented in tons, metric tons, cubic yards, carloads, etc., and is usually associated with a grade(s) of valuable material(s) contained in a given amount of ore produced.
Enumerated_Domain_Value_Definition_Source: USGS Authors
Attribute:
Attribute_Label: Mat_Units (Production, Resources)
Attribute_Definition: The units of the material amount (Mat_Amnt) field.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "cubic meters", "metric tons", or "short tons", etc.
Attribute:
Attribute_Label: MatAmntSI (Production, Resources)
Attribute_Definition:
The reported amount of the material (Mat_Amnt) converted to International System of Units (SI). The minimum and maximum values listed below are from the MatAmntSI field in the Resources table with variable units. The values in the Production table range from 450 – 50,092,497,900 with variable units. A negative sign indicates that the amount value is listed for multiple commodity forms. For example, if the source says that there were 47,000,000 metric tons of ore containing 1.43 percent sodium, 0.58 percent fluorine, 3.83 percent potassium, and 0.26 percent lithium, -47,000,000 would be entered in Mat_Amnt for each record (table row). When appropriate MatAmntSI values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 31,600
Range_Domain_Maximum: 9,500,000,000
Attribute_Units_of_Measure: See MatUnitsSI.
Attribute:
Attribute_Label: Material (Production, Resources)
Attribute_Definition:
The material reported in the production value or resource estimate of the source report.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "boric acid (H3BO3)", "lithium (Li)", or "tungsten trioxide (WO3)", etc.
Attribute:
Attribute_Label: MatUnitsSI (Production, Resources)
Attribute_Definition:
The material amount units reported (Mat_Units) after conversion to International System of Units (SI). When appropriate MatUnitsSI values are calculated by USGS authors. These values are denoted by a '111' decimal trailer.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "cubic meters", "liters", or "metric tons", etc.
Attribute:
Attribute_Label: Min_Age (GeolMinOcc)
Attribute_Definition:
Age of mineralization. Values may be millions of years (Mega-annum [Ma]), descriptive text, or a combination.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "14.9 Ma", "340 +/- 5 Ma" or "Holocene", etc.
Attribute:
Attribute_Label: Min_Style (GeolMinOcc)
Attribute_Definition: Describes how the valuable materials occur.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "brine", "disseminated", or "evaporite", etc.
Attribute:
Attribute_Label: MinReg_ID (Site)
Attribute_Definition:
Unique identification of a mineral region. The MinReg_ID is the same as the Ftr_ID in the Loc_Pt table. In this database, mineral regions are attributed as areas, mineral districts, or mining districts that contain one or more mine or mineral occurrence feature.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "Mr00080", "Mr00127", or "Mr00159", etc.
Attribute:
Attribute_Label: Other_Name (Loc_Pt, Site)
Attribute_Definition:
Other reported names of the mineral region, mineral occurrence, mine, or site. Descriptive text, not abbreviated.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Carolina Lithium belt", "Clayton Lake; Clayton Valley Brine Field; Clayton Valley; Albemarle Corp." or "Kings Mountain deposit", etc.
Attribute:
Attribute_Label: Poly_Def (Loc_Pt)
Attribute_Definition:
Type of polygonal boundary. Definitions of polygons are typically derived from map legends or source descriptions.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Approximate extent of H2S-Rich Belt on figure", Approximate extent of inferred resource model domain from map", or "Approximate extent of lithium lens on map", etc.
Attribute:
Attribute_Label: Production (Site)
Attribute_Definition:
Indicates whether the production data for the mine(s) on the site have been recorded in the Production table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Pt_Def (Loc_Pt)
Attribute_Definition:
Point definition from source report or approximated by authors. Points can be captured from a source report figure or map, or approximated by the authors to show a location of a mine (for example, center of pit). In cases where a mineral occurrence or mineral region boundary was available, the polygon was digitized and the point represents the approximate center of the polygon (centroid).
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Approximate center of Salton Sea KGRA on map", "Approximate center of polygon from map", or "Approximate location of Pilot plant on figure", etc.
Attribute:
Attribute_Label:
Ref_Detail (Dep_Model, History, Loc_Poly_Sw, Loc_Pt, Production, Resources)
Attribute_Definition:
The figure, page, map, etc. number that the data were recorded from. If the data occurs in a table on a certain page, the table name or number and page number are captured. When a figure number is denoted on a page, the syntax of this field is "Page number, Figure number".
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Page 11", "Page 3, Figure 2", or "Page K7, Figure K5", etc.
Attribute:
Attribute_Label:
Ref_ID (Descr_Sum, GeolMinOcc, History, Loc_Poly_Sw, Loc_Pt, Production, References, Resources)
Attribute_Definition:
Shortened reference identification of the source report. Identification includes author name(s) and publication year.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Arkansas Oil and Gas Commission (2018)", "Blois and others (2017)", or "Fourie (2018)", etc.
Attribute:
Attribute_Label: Reference (References)
Attribute_Definition:
Full reference of the source report. References are listed using USGS citation format.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Carew, T.J., and Rossi, M.E., 2016, Independent technical report for the Lithium Nevada project, Nevada, USA, prepared for Lithium Americas Corp. [Effective date May 31, 2016]: Vancouver, British Columbia, Canada, SRK Consulting Inc., June 2, 119 p. [Also available at http://sedar.com.]", Davis, J.R., Friedman, I., and Gleason, J.D., 1986, Origin of the Lithium-Rich Brine, Clayton Valley, Nevada, chap. L of Peterman, Z.E., and Schnabel, D.C., eds., Shorter Contributions to Isotope Research: U.S. Geological Survey Bulletin 1622, p. 131-138.", or "Perry, R., and Visher, M., 2015, Major mines of Nevada 2014—mineral industries in Nevada's economy: Nevada Bureau of Mines and Geology Special Publication P-26, 28 p.", etc.
Attribute:
Attribute_Label:
Remarks (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources, Site)
Attribute_Definition:
Additional author comments, remarks, or information about the feature or data. Descriptive text, not abbreviated.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Location coordinates provided by a online database", "Mineral region is defined by the underlying geothermal reservoir", or "The deposit lies roughly 350-450 m below the surface", etc.
Attribute:
Attribute_Label: Resources (Site)
Attribute_Definition:
Indicates whether the resource or reserve estimates for the deposit(s) on the site have been captured in the Resources table.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
A "Yes" or "No" value indicating which corresponding tables contain attribute information related to the site.
Attribute:
Attribute_Label: Rsrc_Class (Resources)
Attribute_Definition:
Indicates how the resource or reserve was classified in the source report. 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) or the Joint Ore Reserves Committee Code (JORC Code). Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. Descriptive text, not abbreviated.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Demonstrated", "Indicated", or "Indicated plus Inferred", etc.
Attribute:
Attribute_Label: Rsrc_Code (Resources)
Attribute_Definition:
Standard classification system used to classify and report the 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: http://www.cim.org/
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: JORC
Enumerated_Domain_Value_Definition:
The Australian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves ('the JORC—Joint Ore Reserves Committee—Code') is a professional code of practice that sets minimum standards for Public Reporting of minerals Exploration Results, Mineral Resources and Ore Reserves. The JORC Code provides a mandatory system for the classification of minerals Exploration Results, Mineral Resources and Ore Reserves according to the levels of confidence in geological knowledge and technical and economic considerations in Public Reports.
Enumerated_Domain_Value_Definition_Source: http://www.jorc.org/
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SEC
Enumerated_Domain_Value_Definition:
U.S. Securities and Exchange Commission (SEC) filings. The most common SEC form used in this database is a 10-K Annual report pursuant to Section 13 or 15(d).
Enumerated_Domain_Value_Definition_Source: https://www.sec.gov/
Attribute:
Attribute_Label: Rsrc_Date (Resources)
Attribute_Definition:
Year of the resource estimate. If the value is "Null", the date of the resource estimate is unknown and most likely does not equal the date of the resource source publication. Format is YYYY.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "1959", "1985", or "2010", etc.
Attribute:
Attribute_Label: Rsrc_Descr (Resources)
Attribute_Definition:
Indicates how the resource or reserve was reported in the source report.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "In-situ Mineral Resource", "Mineral Resource", or "Reserve", etc.
Attribute:
Attribute_Label:
Site_ID (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Pt, Production, Resources, Site)
Attribute_Definition:
Unique identification assigned to a site. Format is two-letter state abbreviation and a 5-digit number.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "AR00002", "CA00002", or "NV00118", etc.
Attribute:
Attribute_Label: Site_Name (Site)
Attribute_Definition:
Site name assigned by authors. Mine and mineral occurrence features are grouped into sites based on geological characteristics or location.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Bessemer City", "Clayton Valley South", or "Smackover-Lanxess", etc.
Attribute:
Attribute_Label: StatDetail (History)
Attribute_Definition:
Status detail that pertains to the type of activity that occurred during a specified time period, as shown in the Year_From and Year_To fields. Values include descriptive text entry.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain:
Values may include "Borax discovered", "Discovered in 1927", or "JORC compliant report", etc.
Attribute:
Attribute_Label: State (Loc_Poly_Sw, Loc_Pt)
Attribute_Definition: U.S. state name abbreviated using 2-letter codes.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "CA", "NC", or "NV", etc.
Attribute:
Attribute_Label: Status (History)
Attribute_Definition:
The type of activity that took place during a specified time period, as shown in the Year_From and 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: Development
Enumerated_Domain_Value_Definition:
Indicates planning and studies are in progress or have been completed for the development of the mine, or that a mine is actively under development.
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: AGI (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: AGI (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: AGI (2011)
Attribute:
Attribute_Label: Value_Mat (GeolMinOcc)
Attribute_Definition:
Valuable materials (minerals or rocks) that comprise the valuable constituents of a deposit.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "brine", "cassiterite", or "spodumene", etc.
Attribute:
Attribute_Label: Year_From (History, Production)
Attribute_Definition:
First year of production or history. When mine production was intermittent, only the first and last year of reported production are shown. See Last_Updt (last updated) field for the currency of the values.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "1862", "1950", or "2019", etc.
Attribute:
Attribute_Label: Year_To (History, Production)
Attribute_Definition:
Last year of production or history. When mine production was intermittent, only the first and last year of reported production are shown. See Last_Updt (last updated) field for the currency of the values.
Attribute_Definition_Source: USGS Authors
Attribute_Domain_Values:
Unrepresentable_Domain: Values may include "1862", "1950", or "2019", etc.
Overview_Description:
Entity_and_Attribute_Overview:
The entity and attribute information provided describe 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 was 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.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Person: USGS Information Services
Contact_Address:
Address_Type: mailing address
Address: Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States of America
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Distribution_Liability:
This database, Lithium Deposits in the United States (https://doi.org/10.5066/P9ZKRWQF) has been approved for data release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Digital Data
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9ZKRWQF
Fees: None. No fees are applicable for obtaining the data set.
Metadata_Reference_Information:
Metadata_Date: 20190725
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Carma A. San Juan
Contact_Organization: U.S. Geological Survey, Southwest Region
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: United States
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

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