Riverview Mine (Riverview claims; Eureka Mine; Bonanza Mine; Old Selby Mine; Old Selby Bonanza Mine), Imperial National Wildlife Refuge, Silver District, Trigo Mts, La Paz Co., Arizona, USA
Latitude: 33°2'18"N
Longitude: 114°33'50"W
‡Ref.: Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 50, 71.
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 97.
Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 178 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10102587, MRDS ID #M004634; and, Dep. ID #10113885, MAS ID #004634.
A small former surface and underground Pb-Ag-Zn-Au-Fe mine located in the NE¼ sec. 31, T4S, R22W, a short distance N of the Colorado River, on federal land. Started about 1875. Owned at times, or in part, by Selby; Ferguson; Sentenac Mines Co.; Riverview Mines Co.; and, Rocher.
Mineralization is pockety ore shoots of lead and zinc carbonates with scattered bunches and narrow veins of galena and iron-rich sphalerite in a gangue of iron oxides, manganiferous to ferruginous calcite, brecciated wall rock, and gouge in lensing fault zone veins cutting metamorphic Mesozoic schist. The ore zone strikes N70E and dips 40NW. Vein walls show pyrite metacrysts and pronounced silicification and chloritization. An associated rock unit is granite.
Workings include shaft, several hundred feet of tunnels, a few shallow winzes, small stopes, and numerous open cuts operations. This mine was worked intermittently since about 1875. Total estimated and recorded production would be some 150 tons of ore averaging about 14% Pb, 6 oz. Ag/T, 8% Zn, and 0.2 oz. Au/T.
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