HematiteYuma Mine, Ellsworth District, Granite Wash Mts, La Paz Co., Arizona, USA
Photo: Rob Lavinsky Latitude: 33°50'25"N
Longitude: 113°44'56"W
Ref.: Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 95-97.
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: 150 (Table 4).
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology production file data.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10027694, MRDS ID #M003845; and, Dep. ID #10186681, MAS ID #0040120010.
A former surface and underground Cu-Ag-Au-Pb-Fe mine located in the SE¼ sec. 19 & the NE¼ sec. 30, T6N, R14W (protracted), 7 miles due N of Vicksburg, on BLM-administered land. The USBM gives the location as T6N, R14W, sec. 30 and latitude 33-50-26N, longitude 113-44-55W on the Salome Quadrangle map. Discovered 1865. Produced 1942 to 1963. Owned at times, or in part, by the Ironwood & Arizona Development Co.; Yuma Copper Co.; Spry; Liberator Mines Corp. of America; Snyder; Minerals Corp. of America; and the South California Chemical Co. Owned by Dan Nelson, Frank Aubel and Art Morin (1979).
Mineralization is a vein deposit with a linear ore body hosted in quartzite, mica schist and limestone. It is mostly oxidized copper mineralization in contact metamorphosed limestone beds in metamorphosed Mesozoic sediments intruded by Laramide granite and cut by acidic and basic dikes. Strong iron gossans from primary magnetite and pyrite, with quartz stringers, calcite, and contact metamorphic minerals. Wall rocks are fractured and strongly chloritized and epidotized. Ore control was fracturing and contact metamorphism.
The partial replacement of a ledge of yellow crystalline limestone by magnetite in the vicinity of the camp is the most conspicuous part of the section exposed on the property. The replacement of the limestone by magnetite may be one of the results of the metamorphic action produced by the intrusion of the granite in this general vicinity.
Workings include a shaft, tunnels, and open cut. An adit 680 feet long connects with a 75 foot deep shaft; two winzes of 405 and 420 feet, respectively, were sunk, as well as shallow surface cuts. This mine was prospected and worked intermittently but mainly from 1942 through 1963. It produced some 8,600 tons of ore averaging about 2.3% Cu, 0.3 oz. Ag/T, and 0.03 oz. Au/T.
Mineral List
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