‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 252-253.
Kartchner, W.E. (1944) The geology and ore deposits of a portion of the Harshaw district, Patagonia Mountains, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 100 p.
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 59 (Table 4).
Arizona Bureau of Mines file data.
A Zn-Pb-Ag-Cu-Au (Mn) mine located on patented claims in the SE ¼ sec. 32, T.22S. R.16E., at the head of Alum Gulch, about 1 mile south of the World's Fair Mine and 1½ miles west of Harshaw, at an elevation of 4,900 feet. Owned at times, or in part, by Blue Flag Mining Co., Summit Colorado (circa 1915); Farrell; January Mines Co.; Big Jim Mines, Inc.; and the American Smelting and Refining Corp. (ASARCO).
Mineralization is strong and persistent quartz vein, with rich argentiferous cerussite in the oxide zone with sulfides in depth, in a fault zone cutting altered Cretaceous andesite. Wall rock is locally strongly pyritized and propylitized. Manganese and iron oxide gossan. Alum and sulfur are found leaching from the dump.
It is opened along a dike of rhyolite that dips 78ºNE. in the diorite and extends from the mine for about ¼ mile down the road and stream to the NW. The dike is 15 to 20 feet wide, and the diorite for 4 feet from the contact on the NE or hanging wall side contains considerable manganese.
Workings include operations from shafts and the neighboring Trench Mine. Worked from the early 1870's for high-grade silver ore and in 1925-1928 and 1944-1949 for zinc and lead. Total production was probably some 71,000 tons of ore averaging about 6% Zn, 4% Pb, 7 oz. Ag/T, and minor copper and gold.
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