Ref.: Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 105-109.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 128-131.
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: 152 (Table 4).
Arizona Bureau of Mines file data.
A Au-Ag-Pb-Cu-Zn mine group located in the SW¼ sec. 22, the NW¼ sec. 27 & the NE¼ sec. 22, T4N, R13W (protracted). Owned at times, or in part, by Hubbard & Bowers; Bonanza Mining Co.; Harqua Hala Gold Mining Co.; Yuma Warrior Mining Co.; Harquahala Operating Co.; Bonanza & Golden Eagle Mining Co.; Jones; and, Oberstine.
Mineralization is rich, pockety shoots of gold with minor silver in a gangue of iron oxides, shattered quartz, calcite and gypsum in the oxidized zone(s), above about 300 feet of depth, in shear zones and shattered quartzite in strongly folded and faulted Paleozoic sedimentary beds intruded by Laramide quartz monzonite. In depth, gold values mainly in auriferous pyrite with with some copper and lead sulfide mineralization, in fracture veins in underlying crushed and fractured quartz monzonite. Veins often flat dipping with larger and richer deposits in the shattered quartzite.
Workings include shaft(s), tunnel and open cut operations. Extensive stoping occurred in oxidized zone(s). Discovered in 1888 and worked intermittently ona large scale until 1918, subsequently on a small scale, until 1964 (largely reworking tailings and dump). Total estimated and recorded production would be some 150,000 tons of ore averaging about 0.85 oz. Au/T, 0.53 oz. Ag/T and minor lead and copper.
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