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Magmatic Copper Mine (Magmatic Copper Company claims; Stacy claims; Lode Star claims), Apache Leap, Superior, Pioneer District, Pinal Mts, Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 15' 20'' North , 111° 5' 21'' West
Latitude & Longitude (decimal): 33.2555555556, -111.089166667
A group of 7 Mn-Au-Ag-Fe claims located in sec. 14, T2S, R12E, in the low-lying hills at the base of the westerly slope of Apache Leap (W of highway 177 [Superior-Ray Road]), about 2 miles South of Superior, at 3,000 feet of altitude. Owned by the Magmatic Copper Co. (1930). The claims extend into secs. 11 & 15.

Rocks exposed are quartzite, limestone, diabase and dacite. The quartzite forms the base of the series, and it is overlain by several hundred feet of massive limestone. A large mass of diabase is intruded into the limestone on the East sideof the claim group. South of the working shaft, between 2 faults, is an area of dacite identical with the rock forming the drest of Apache Leap. The sedimentary rocks strike about North and dip 35ºE. A prominant Northward-trending fault can be traced for several thousand feet on the claims. It cuts the limestone and South of the shaft, brings dacite into contact with the limestone.

Mineralization is manganese deposits that occur in the fault fissures or along bedding planes of Escabrosa Limestone adjacent to the faults. Lenses of manganous iron ore a few feet long occur along the faults, associated with silicified limestone and jasper. They dip 40W and are 3.05 meters thick.

Material from the working shaft is granular and dark brown and crumbles to a powder on exposure to air. Fresh pieces show specks and narrow seams of manganese oxides in the predominantly reddish-brown iron oxides. Many pieces show partly decomposed, coarse crystals of a brownish spar which may be manganous siderite.

Area structures include a minor N-S fault at the south end of the Concentrator Fault System; N-S-trending fault systems; N-S-trending sediments with a E dip; and various E-W-trending faults.

Workings include a 130 foot deep shaft and several older shafts at 50, 80 & 100 feet deep, respectively, and a 100 foot long tunnel.

Mineral List

6 entries listed. 3 valid minerals.

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Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 163-164.

Wilson, E.D. & G.M. Butler (1930), Manganese ore deposits in Arizona, Arizona Bureau of Mines Bull. 137: 84-85.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese deposits of eastern Arizona, US Bureau of Mines Information Circular 7990: 141-142.

USGS Mineral Investigations Field Studies Map MF-253 (1962).

Arizona Department of Mineral Resources Magmatic Copper Mines file, map.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology production file data.

Arizona Department of Mineral Resources file data.

MRDS database Dep. ID #10092689, MRDS ID #M899884; and Dep. ID #10113704, MAS ID #0040210794.

Mineral and/or Locality  
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