Latitude: 31°58'3"N
Longitude: 109°59'4"W
‡Ref.: Mahoney, C.G. (1942) U.S. Bureau of Mines, unpublished War Minerals Memo on the Seneca Mine (unpublished): 1-2.
Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 26-28.
Burnham, C.W. (1959), Metallogenic provinces of the southwestern US and northern Mexico: New Mexico Bureau of Mines and Mineral Resources Bull. 65: 30.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 64 (Table 4).
Chatman, M.L. (1993) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 30-93: 37, D35-D36.
MRDS database Dep. ID file #10046201, MRDS ID #M241046; and, Dep. ID #10208450, MAS ID #0040030208.
A former small surface and underground Cu-Zn-Pb-Ag (Cd) mine located in the SE ¼ sec. 10, T.17S., R.23E., on the northeastern margin of the Dragoon Mountains, 9 miles NW of Pearce and approximately ¾ mile N of Mt Glenn. Discovered 1916. Produced 1942-1943. Owned by the Le Roy Mines Co. Operated by Skinner & Lewis.
Mineralization is sulfides in irregular masses in brecciated wall rock in a vein structure in metamorphosed Naco Limestone.
Prevailing rock consists of metamorphosed siliceous Naco limetone which, less than ½ mile father south, is intruded by the Stronghold Granite. The workings are on the gently eastward-dipping flank of a low anticlinal roll in the limestone.
Local structures include closely folded rocks, thrusts, deep reverse faults with superimposed oligocene metamorphism; complex Tertiary faulting of Paleozoic and Cretaceous sediments; and Tertiary intrusives.
The vein strikes south and dips 20º to 30ºE., and is intersected by a tight barren fracture along the back of the adit. Much of the vein is thin and weakly mineralized. It becomes 1 to 5 feret thick where intersected by zones of inconspicuous northeast fissures.
Workings include an adit extending S.30ºW., with some small stopes and short raises; and a shaft of undertermined depth. workings. About 248 tons of ore were shipped in 1942-1943, containing 25% Zn, 5% Pb, and 1.5 oz. Ag/T.
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