Introduction
This report describes a digital map generated by the U.S. Geological Survey (USGS) to provide digital
spatial mining claim density information for federal lands in Idaho as of March 1997. Mining claim data is
earth science information deemed to be relevant to the assessment of historic, current, and future ecological,
economic, and social systems. There is no paper map included in this Open-File report.
In accordance with the Federal Land Policy and Management Act of 1976 (FLPMA), all unpatented mining
claims, mill and tunnel sites must be recorded at the appropriate Bureau of Land Management (BLM) State
office. BLM maintains a cumulative computer listing of mining claims in the Mining Claim Recordation
System (MCRS) database with locations given by meridian, township, range, and section. A mining claim
is considered closed when the claim is relinquished or a formal BLM decision declaring the mining claim
null and void has been issued and the appeal period has expired. All other mining claims filed with BLM
are considered to be open and actively held. The digital map (figure 1.) with the mining claim density
database available in this report are suitable for geographic information system (GIS)-based regional
assessments at a scale of 1:100,000 or smaller.
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First posted March 2, 2000
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