Ref.: Endlich, F.M. (1897), The Pearce Mining Distict, Engineering and Mining Journal: 63(23): 571.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 34.
Raup, R.B., and Haines, D.V. (1953) [Prospects on Fluorine Hill, Pearce district]: U.S. Geological Survey Trace Elements Preliminary Reconnaisance Report D-1497, 1 p. [also available in U.S. Atomic Energy Commission Report RME-154, p. 53].
Wells, R.L., and Puttuck, H.E. (1953) [Pearce mine, Pearce district]: U.S. Atomic Energy Commission Preliminary Reconnaissance Report, File A-P-46, 1 p. [also available in U.S. Atomic Energy Commission Report RME-154, p. 74].
Gilluly (1956): 116-118.
Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187: 11, 69 (Table 4).
This is most recently a fluorspar mining area that formerly produced Au-Ag-Pb-Cu with potential for U-As. Total production of metals amounts to 1,341,000 tons of ore yielding 126 tons of copper, 8 tons of lead, about 138,000 ounces of silver and more than 12,000 ounces of gold. Production was from 1895 to the 1940's, with fluorite being produced until 1971. It is a relatively small district located in T.17,18S., R.25E. in hills in the Sulphur Spring Valley.
Area rocks are comprised of Tertiary volcanic rocks (andesite flows & breccias). Mineralization occurs as silver chloride and bromide, and free gold, with fluorite, minor and spotty ozidized copper sulfides and traces of uranium, in a series of quartz-calcite veins in breccia zones and in narrow replacement beds in folded and faulted Tertiary rhyolite and andesite volcanics resting on Cretaceous Bisbee Group beds.
