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Mineral resource occurrence data covering the world, most thoroughly within the U.S. This database contains the records previously provided in the Mineral Resource Data System (MRDS) of USGS and the Mineral Availability System/Mineral Industry Locator System (MAS/MILS) originated in the U.S. Bureau of Mines, which is now part of USGS. The MRDS is a large and complex relational database developed over several decades by hundreds of researchers and reporters. This product is a digest in which the fields chosen are those most likely to contain valid information. CGS NOTES: This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts as well as small adjacent areas of Oregon and Nevada. The points represent locations of mines and prospects derived and edited from the companion feature class MRDSMinesORIGINAL_AllDistricts, which was extracted from the U.S. Geological Survey Mineral Resources Data System (MRDS); additional records of mines have been added to this data set by staff of the California Geological Survey. The intent of editing of the original MRDS data was mainly to remove multiple records that represent the same mine or prospect or to improve accuracy of locations of these features. Additional features related to mining activity are available in the companion TOMS feature classes. |