DRECP Mines (MRDS & AMLU's Topographically Occurring Mine Symbols (TOMS))

1) USGS: Mineral Resources Data System (MRDS):

This dataset was created for use in terrestrial intactness models by extracting out portions of the MRDS mines dataset within the DRECP 12km Boundary.

Summary

This digest of the complex mineral resources database is intended for use as reference material supporting mineral resource and environmental assessments on local to regional scale worldwide.

Description

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.
 
2) California Department of Conservation: Office of Mine Reclamation (OMR): Abandoned Mine Lands Unit (AMLU)

This dataset was created for use in species and terrestrial intactness models by extracting out portions of the AMLU's Topographically Occurring Mine Symbols (TOMS) dataset within the DRECP 12km Boundary.

Summary

To develop a statewide digital spatial dataset of accurately located mining features. Other digital datasets covering the state are limited to mining operations (or claims) but do not locate physical features resulting from mining.

Description
 
Mining feature symbols digitized from 1:24000 scale, 7.5 minute USGS topographic quadrangles as scanned by the Stephen P. Teale Data Center (July, 1998).