Big Six MineAll mine locations were obtained from the USGS place names database. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property. |
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State: Colorado
County: Boulder
Elevation: 8,284 feet
Latitude: 39.9638758
Longitude: -105.5130535
Type: Tungsten
Ore: Ore shoot had a stope length of about 40 ft on each level; plunged northeast; localized where at least one wall is aplite. Three drill holes showed a little ore at depths of 20 to 30 ft below bottom level; some underhand stoping done, but vein barren where cut by a hole 65 ft below level (not shown on map). Ore in main stopes consisted of veinlets of ferberite in brecciated horn quartz and sheeted aplite and schist. Ore mined in 1943 assayed about 1 percent WO3.
History and production: Mine owned by Crow Estate; worked by many different lessees at intervals from 1915 or earlier up to 1943, when operated by Boulder Tungsten Mills, Inc. Production not known; probably less than 1,000 units of W03.
Source: Geology and Ore Deposits of the Boulder County Tungsten District Colorado. USGS Professional Paper 245, 1953
