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Franklin-Cushing & Marion Mine group (Rosemont group; Lewisohn Estate), Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 49' 59'' North , 110° 45' 50'' West
Latitude & Longitude (decimal): 31.8330555556, -110.763888889
Other regions containing this locality:Sonoran Desert, North America


Ref.: Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 126 (Table 4).

USGS Sahuarita Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10137946, MAS ID #0040190226.

A former underground Cu-Ag-Au mine group located in South-central (SW¼SE¼) sec. 25, T.18S., R.15E, on private land. Owned by the Lewisohn Estate, then ASARCO from 1988. These patented claims are part of the Helvetia property owned by ASARCO (1992).

Mineralization is a fissure vein with relatively small, spotty, irregular, and shallow pyrometasomatic deposits of copper carbonates and minor sulfides in thrust-faulted, silicated, Paleozoic limestone blocks.

Workings include tunnel operations. Produced some 150 tons of ore averaging about 4% Cu and 2 oz. Ag/T in 1944.

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