Spiderleg 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: 8,235 feet
Latitude: 39.9627648
Longitude: -105.5099978
Type: Tungsten
Location: 1,475 ft N. 370 E. of new shaft of Conger mine.
Workings: See figure 84 in gallery.
Geology: Workings on overlapping veins in two vein zones, one trending about north and one northeast. Most of veins dip east, but chief vein in southern part of northward-trending workings dips west. Mine in schist that contains many elongated bodies of pegmatite; veins productive where they cross some of these.
History and production: Veins worked near surface before 1914, when Hershey reported that ore 24 to 30 in. wide and 75 ft long had been mined but had pinched out only a few feet below surface. Most of workings shown in figure 84 driven in 1941-42 by Vanadium Corp. of America, the owner; about 3,800 units of WO3 in ore averaging about 1.2 percent WO3 produced at this time. Total output probably at least 5,000 units.
Source: Geology and Ore Deposits of the Boulder County Tungsten District Colorado. USGS Professional Paper 245, 1953
