Falls claim, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA
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Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12 (Table 1).
USGS Sahuarita Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10026769, MRDS ID #M000172; and, Dep. ID #10186708, MAS ID #0040190223.
A former small underground Cu-Ag mine/claim located in the center (NW¼SE¼) of sec. 25, T.18S., R.15E. (Sahuarita 15 minute topo map), 2 miles SE of Helvetia. Produced 1958-1959. Owned by the Lewisohn Copper Co. (1959); owned and operated by ASARCO (1988-1994 and beyond). The Falls patented claim is part of the Helvetia property owned by ASARCO (1992).
Mineralization is copper carbonates and sulfide in irregular pyrometasomatic lenses in thrust-faulted segments of silicated Paleozoic limestone, cut by cross-faulting.
Workings include a shallow shaft and tunnel. Some 170 tons of ore averaging about 5% Cu and 0.3 oz. Ag/T were produced in 1958-1959.
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