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Little Joker Prospect | |
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The Little Joker claim lies north of the St. Louis, on a parallel 4 foot east - west vein. It is opened by three shafts, the deepest 60 feet deep. The croppings of the vein are prominent, standing in places, as west of the shafts, from 4 to 10 feet above the surface. The vein as exposed in the main shaft and tunnel is composed principally of quartz and barite. It is crushed and iron stained and contains pockets and stringers of galena, and the joints are coated with copper carbonates and apparently silver bromide. The sorted ore is said to average 5.2% in copper and 22.3 ounces in silver and about $1 in gold to the ton.2 The mine is part of the Anaconda group. Alternate NamesNone CompanyJohn Parks, Anaconda-Arizona Mg. Co., Altamirano, Boulder Mg. Co.5 Mining DistrictWrightson District Location21S 15E, NW¼ Cen. S., Cen. & SW¼ 3 N. Cen. & NE¼ 105 Mineral ProductsAg, Pb, Cu, Zn-, Au- 5 GeologyLensing quartz fissure veins containing calcite and barite, and with shoots, stringers, and seams of argentiferous galena, chalcopyrite, sphalerite, tetrahedrite and pyrite. Veins are often vuggy with mineralization banded or lining vugs. Wall rock is Triassic rhyolite and latite volcanics [Anaconda Group as a whole].5 Type of Operation and ProductionTunnel and shaft operations. Worked from early 1870s and intermittently through 1949, producing some 300 tons of ore averaging about 5% Pb, 30 oz. Ag/T, 3% Cu, and minor Au. [Anaconda Group as a whole]5 References
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