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Columbia Mine, Amole District, Tucson Mts, Pima Co., Arizona, USA

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‡Ref.: Ashley, R.P. (1974) Field Examination (Columbia Mine).

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 84 (Table 4).

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12 (Table 1).

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039853, MRDS ID #M050934; and, Dep. ID #10186309, MAS ID #0040190161.

A former small surface and underground Cu-Ag mine located in the SE ¼ sec. 30, T.13S., R.12E. (Avra 7.5 minute topo map), 10 miles NW of Tucson, on National Park land (Saguaro National Monument West). Produced 1907-1954. Owned at times, or in part, by the Columbia Copper Co.; the Mile Wide Copper Co.; Mr. Miles Durick; and the L.B.D.M. Mining Co.

Mineralization is copper carbonates and sulfides in irregular, small, replacement bodies/pods along fracture zones in limestone lenses in Cretaceous arkose close to a Laramide intrusive dike. The ore pod is 2 meters long. Cu silicate occurs on fractures in a massive limonite body. Alteration is pyrite gossan.

Workings include shallow openings, pit. Some 130 tons of ore were produced in 1954, averaging about 2% Cu and 0.4 oz. Ag/T.

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