A former underground Ag-Cu-Au-Zn-Mn-Pb mine located in sec. 26, T1S, R12E, about 1 mile N of Superior and about 2 miles SW of Kings Crown Peak, on private land. Produced during the period 1940-1947. Claims extend into sec. 25. The original Baltimore shaft of the Magma Chief was located in the SW¼ sec. 24. Owned by the Magma Copper Co. Operated by K. Pomeroy (1940's). Claims included the Baltimore, Watson, Picketpost, Lonewedge, Palace, Tuna, and the Gerald Canlser.
Mineralization is a replacement deposit in Escabrosa Limestone and Martin Limestone. Ore control was contact of the two limestone units. Orebody was lens-shaped masses striking N10W, dipping 20-30NE, at 3.66 meters thick. Area structures include E-W-trending faults cutting N-S-trending fault systems. The E-W Conley Springs Falt is ¼ mile north of the mine.
Regional structures include EW-trending faults cutting N-S-trending fault systems, the E-W Conley Springs Fault is ¼ mile N of the mine.
Oldest workings are the Baltimore tunnel; the largest workings are the Watson tunnel, running E-W. There are two shorter tunnels on the Picket Ppost claim. Magma Chief Copper Co. dug the Watson and Baltimore tunnels around 1917. The same Magma Chief Copper Cco. also owned the Magma Chief Mine in the Bunker Hill District.
References
Jones, Jr., E.L. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 162.
Farnham, L.L. (1930) Manganese Ore Deposits in Arizona, Arizona Bureau of Mines Bull. 127: 84.
Wilson, E.D. and Butler, G.M. (1930), Arizona Bureau of Mines Bull. 127, Manganese Ore Deposits in Arizona: 84.
Elsing and Heineman (1939) USGS Bull. 140: 99.
Short, M.N., Galbraith, F.W., Harshman, E.N., Kuhn, T.H., and Wilson, E.D. (1943) Geology and Ore Deposits of the Superior Mining area, Arizona. Arizona Bureau of Mines Bulletin 151: Plate I.
Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese deposits of eastern Arizona, US Bureau of Mines Information Circular 7990: 124, 126-129.
Arizona Department of Mineral Resources Iberrian & Cameroon claims file.
Arizona Department of Mineral Resources Magma Copper Co. files.
Arizona Department of Mineral Resources U files.
USGS Superior Quadrangle map.
U.S Bureau of Mines Mining District Sheet #608.
Arizona Department of Mineral Resources Magma Chief Mine file.
MRDS database Dep. ID #10048315, MRDS ID #M899883; and Dep. ID #10186390, MAS ID #0040210646.
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