Mine plants and operations for commodities monitored by the National Minerals Information Center of the USGS. Operations included are those considered active in 2003 and surveyed by the USGS.
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mineplant-fUS.kml (uncompressed 3.3M bytes)
mineplant-fUS.kmz (compressed 171k bytes)
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https://mrdata.usgs.gov/services/mineplant (WMS, version 1.3.0)
https://mrdata.usgs.gov/services/wfs/mineplant (WFS, version 1.1.0)