Greenback Mine (Bullion group; Garnet group; Vindicator Gold Mining Co. property; Golden King; Hinshaw property; Pinal shaft), Cathedral Rock area, Cimarron Mts, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USA

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A former underground Au-Ag-Cu mine located in sec. 33, T10S, R2E, about 2 miles S of Cathedral Rock, on the N slope of the Cimarron Mountains. Discovered 1895 and produced 1939-1940 prior to closure. Also known as / designated: Black Diamond group; Pinal Grande Mining Co. property; London group; Silver Queen group. Workings extend to secs. 29, 32 & 33. Additional claims were added to the original 10 located in 1916, including 17 claims in 1917, the Greenback group of 20 claims in 1918, and the Silver Queen group (Vindicator Gold Mining property) in 1921. Previous owners/operators include Humphrey (1916); Paul Hinshaw (1917-1919); the Pinal Grande Mining Co. (Paul Hinshaw) (1919-1924); Greenback Gold Mining Co. (Paul Hinshaw and Frank Royer) (1924-1926); Wesley Oates (1932); Frank M. Leonard (1932-?); and Ramon Andrade (1939-40).

Mineralization is a lens-shaped ore body hosted in Pinal Schis and in Tertiary volcanic rocks (dacite). The ore zone strikes N70E-N70W, dips 45-50S at 0.91 meters thick. Younger mineralization than in the Vekol District and the Copperosity Mine to the NE. Ore control was E-W-trending fault zones. An associated rock unit is dacite. Area structures include NW and NE-trending fault zones, E-W-trending fault zones and an E-W-trending fault zone through the mine. Two parallel NW-trending faults occur 1/3 mile SW of the mine.

Workings include the Pinal shaft (688 feet deep on a 50 degree incline), the Green Back shaft (100 feet deep on a 40 degree incline).

References

Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Cllection, University of Arizona Library & Arizona Bureau of Mines Library: 340-342.

Tenney, J.B. (1934) Economic Geological Reconnaissance of Casa Grande Mining District. Arizona Bureau of Mines.

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

USGS Vekol Mountains Quadrangle map.

Arizona Department of Mineral Resources file data.

Arizona Department of Mineral Resources Pinal Copper and Uranium Corp. file.

Arizona Department of Mineral Resources Greenback Mine file.

Arizona Department of Mineral Resources U file.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID #10109774, MRDS ID #M241171; and Dep. ID #10210919, MAS ID #0040210495.

Mineral List

Chrysocolla

Gold

Malachite

3 entries listed. 3 valid minerals.