This data release contains the analytical results and evaluated source data files of geospatial analyses for identifying areas in Alaska that may be prospective for different types of lode gold deposits, including orogenic, reduced-intrusion-related, epithermal, and gold-bearing porphyry. The spatial analysis is based on queries of statewide source datasets of aeromagnetic surveys, Alaska Geochemical Database (AGDB3), Alaska Resource Data File (ARDF), and Alaska Geologic Map (SIM3340) within areas defined by 12-digit HUCs (subwatersheds) from the National Watershed Boundary dataset. The packages of files available for download are: 1. LodeGold_Results_gdb.zip - The analytical results in geodatabase polygon feature classes which contain the scores for each source dataset layer query, the accumulative score, and a designation for high, medium, or low potential and high, medium, or low certainty for a deposit type within the HUC. The data is described by FGDC metadata. An mxd file, and cartographic feature classes are provided for display of the results in ArcMap. An included README file describes the complete contents of the zip file. 2. LodeGold_Results_shape.zip - Copies of the results from the geodatabase are also provided in shapefile and CSV formats. The included README file describes the complete contents of the zip file. 3. LodeGold_SourceData_gdb.zip - The source datasets in geodatabase and geotiff format. Data layers include aeromagnetic surveys, AGDB3, ARDF, lithology from SIM3340, and HUC subwatersheds. The data is described by FGDC metadata. An mxd file and cartographic feature classes are provided for display of the source data in ArcMap. Also included are the python scripts used to perform the analyses. Users may modify the scripts to design their own analyses. The included README files describe the complete contents of the zip file and explain the usage of the scripts. 4. LodeGold_SourceData_shape.zip - Copies of the geodatabase source dataset derivatives from ARDF and lithology from SIM3340 created for this analysis are also provided in shapefile and CSV formats. The included README file describes the complete contents of the zip file.

This data release provides descriptions and locations of 134 significant deposits in Alaska. Approximately 99 percent of past production and remaining identified resources of gold, silver, copper, lead, and zinc in the United States are accounted for by deposits that originally contained at least 2 metric tons (t) of gold, 85 t silver, 50,000 t copper, 30,000 t lead, and 50,000 t zinc. Deposits of this size comprise a very small fraction of the total number of mines, prospects, and occurrences for these metals in the United States. They are called significant deposits because they are few in number yet collectively represent almost the totality of domestic production and resources of these metals. The significant deposits database was first published by the U.S. Geological Survey (USGS) as part of the 1996 National Mineral Resource Assessment (NMRA), which was limited to these five metals. The database was intended to characterize known mineral resources for comparison with estimates of undiscovered resources provided by the NMRA. Data on location, deposit type, past production, and remaining reserves for 1,118 individual significant deposits comprised the original database. During the 20 years since the original database was published, there has been substantial new production and additions to resources at many of the deposits in the database and many new discoveries that meet the criteria for a significant deposit. New information on a few deposits has revealed that some of the deposits in the original database do not meet the criteria for significant deposits and these have been deleted. This data release is a revision of the Alaska portion of the original 1996 database, with updated production and resource data, improved locations, added data on land ownership, and addition of new discoveries. The Excel table provides locations for and information on significant deposits in Alaska. The geodatabase contains a single point layer which represents the locations of these deposits. The attributes of the point layer contain the same information as the Excel database. A detailed description of the original database and its interpretation was published as Long, Keith R., DeYoung, John H., Jr., and Ludington, Steve, 2000, Significant deposits of gold, silver, copper, lead, and zinc in the United States: Economic Geology, v. 95, p. 629-644 (more information available at https://pubs.er.usgs.gov/publication/70022329).

This data release provides descriptions and locations of 134 significant deposits in Alaska. Approximately 99 percent of past production and remaining identified resources of gold, silver, copper, lead, and zinc in the United States are accounted for by deposits that originally contained at least 2 metric tons (t) of gold, 85 t silver, 50,000 t copper, 30,000 t lead, and 50,000 t zinc. Deposits of this size comprise a very small fraction of the total number of mines, prospects, and occurrences for these metals in the United States. They are called significant deposits because they are few in number yet collectively represent almost the totality of domestic production and resources of these metals. The significant deposits database was first published by the U.S. Geological Survey (USGS) as part of the 1996 National Mineral Resource Assessment (NMRA), which was limited to these five metals. The database was intended to characterize known mineral resources for comparison with estimates of undiscovered resources provided by the NMRA. Data on location, deposit type, past production, and remaining reserves for 1,118 individual significant deposits comprised the original database. During the 20 years since the original database was published, there has been substantial new production and additions to resources at many of the deposits in the database and many new discoveries that meet the criteria for a significant deposit. New information on a few deposits has revealed that some of the deposits in the original database do not meet the criteria for significant deposits and these have been deleted. This data release is a revision of the Alaska portion of the original 1996 database, with updated production and resource data, improved locations, added data on land ownership, and addition of new discoveries. The Excel table provides locations for and information on significant deposits in Alaska. The geodatabase contains a single point layer which represents the locations of these deposits. The attributes of the point layer contain the same information as the Excel database. A detailed description of the original database and its interpretation was published as Long, Keith R., DeYoung, John H., Jr., and Ludington, Steve, 2000, Significant deposits of gold, silver, copper, lead, and zinc in the United States: Economic Geology, v. 95, p. 629-644 (more information available at https://pubs.er.usgs.gov/publication/70022329).

The Alaska Resource Data File (ARDF) is a database of mines, prospects, and mineral occurrences in Alaska. It contains information compiled from published and unpublished sources from industry, U.S. Bureau of Mines (BOM), U.S. Geological Survey (USGS), and other government and private sources. ARDF is not a mining claims database.

The Alaska Resource Data File (ARDF) is a database of mines, prospects, and mineral occurrences in Alaska. It contains information compiled from published and unpublished sources from industry, U.S. Bureau of Mines (BOM), U.S. Geological Survey (USGS), and other government and private sources. ARDF is not a mining claims database.

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DGGS Digital Data Series 18, Alaska Minerals Database, is a working, internal database that supports multiple data products developed by the Alaska Division of Geological & Geophysical Surveys (DGGS), including the Alaska Mineral Industry Report series (https://dggs.alaska.gov/pubs/minerals) and a web service of significant mineral industry occurrences and industry activity in 2020. DGGS anticipates developing additional products from the database in the future. This abstract and data dictionary will be updated as more of the database becomes publicly available over time. The full, unpublished database contains information about significant mineral occurrences in Alaska, including industry activity by year, mineral resource estimates, mine production statistics by year, and an interpreted mineral system type using the classification scheme of Hofstra and Kreiner (2020). The database also associates records in Alaska Resource Data File (ARDF; U.S. Geological Survey, 1996) with significant mineral occurrences, as interpreted by DGGS. DGGS annually compiles mineral industry information from past-year statements issued by companies, including press releases and corporate annual and financial reports, as well as phone interviews, replies to questionnaires, and news media articles. Only publicly available data compiled by DGGS are visible; confidential data are incorporated into statewide figures. The database is actively updated as new mineral activity data become available each year. Property information and previous years' data will be updated to resolve errors, reflect new geologic interpretations, and display newly available data. Consequently, products developed from the database may change over time as information and figures are updated. DGGS encourages members of the public to contact DGGS' Mineral Resources Section staff to discuss potential changes to the data or errors to be resolved in our derivative products. The data are available from the DGGS website: http://doi.org/10.14509/30873.

In conjunction with hosting field trips for the Association of American State Geologists 2016 annual meeting in Girdwood, Alaska, Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected rock samples and obtained geochemical analysis from several readily accessible, but relatively unstudied outcrops. Samples were collected from Turnagain Arm (mile 104 Seward Highway), Whittier, Crow Pass, and Panorama Mountain (roughly mile 217 Parks Highway). Mineralized samples from veins and veinlets in granitic rocks from the Crow Pass and Whittier sites contain anomalous levels of gold ranging from 0.129 to 0.650 parts per million (ppm). Although none of the samples are from areas open to mineral entry, geochemical analyses of rocks from these localities may support interpretation of regional mineral-distribution trends. The analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. Additional details about the organization of information are noted in the accompanying metadata file. All files can be downloaded from the DGGS website (http://doi.org/10.14509/29725).