Sheeptrail-Boulevard Mine (Sheeptrail Mine; Boulevard Mine; Minnie Mine), Oatman District (San Francisco District; Union Pass District), Black Mts, Mohave Co., Arizona, USA
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A former underground gold mine located in sec. 7, T.21N., R.20W., about 7 miles from the Colorado River. Discovered in 1865 by Jack Mellen (Sheeptrail Mine) and owned at times, or in part, by the Arizona-Pyramid Gold Mining Co.; and, the New Comstock Mining Co. (1904- ).
Mineralization is a vein that occurs near the contact of granite with a dike of rhyolite-porphyry which forms the hanging wall at the West end of the mine. Small stringers occur both in the granite and in a dike, but most ore mined seems to have come from the rhyolite. The vein strikes NW and dips South and takes a curved course, trending more nearly East-West towards the NW end. At the West end it is cut by a NE fault. Mineralization consists of a number of small stringers of quartz over a width of from 3 to 7 feet. Ore concentration process was descending groundwater that concentrated the ore at or below the water table. Ore control was a NW-trending fissure zone predominently in a rhyolite dike.
Rhyolite dikes in granite, rhyolite flow to the SW of the mine. NW to NNW-trending normal fault. Tertiary flows strike NW and dip 30º-40º NE.
Workings include a 450 foot deep inclined shaft and considerable drifting. Produced an estimated 15,000 tons of ore.
2 entries listed. 2 valid minerals.
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