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Where can I get information about a mine's ownership or maps of a mine?

Mining records for shaft mining used to be maintained by the U.S. Bureau of Mines, which closed in 1996. Their records are in the National Archives and National Technical Reports Library. States are currently the best source for mine ownership records. 

The USGS Mineral Resources Data System (MRDS) may provide some information. The U.S. Bureau of Mines database MAS/MILS (Mineral Availability System/Mineral Industry Location System) was merged into the USGS MRDS database in the early 2000s, so records from both predecessor databases may be present for an individual mine. The MAS/MILS records tend to emphasize economic and operational characteristics, and the MRDS tends to emphasize the geologic setting of the deposits though this is a general statement and in many cases the records are mixtures of those themes.

The USGS does not produce maps of individual mines. The DOI - Office of Surface Mining Reclamation and Enforcement has a National Mine Map Repository. The facility stores over 246,000 mine records of closed and/or abandoned, surface, and underground mines throughout the United States.