‡Ref.: USGS topographic map, Tombstone and vicinity, Arizona (1907).
Butler, B.S., Wilson, E.D., and Rasor, C.A. (1938b), Geology and ore deposits of the Tombstone district, Arizona, Arizona Bureau of Mines Bull. 143: Plates III & IV.
Williams, S.A. (1978), Khinite, parakhinite and dugganite, three new tellurates from Tombstone, Arizona, American Mineralogist: 63: 1016-1019.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 209, 254, 428.
MRDS database Dep. ID file #10039571, MRDS ID #M050352.
A former medium output underground Ag-Pb-Zn-Cu-Au-Mo mine located in the NW¼ sec. 14, T20S, R22E, 1.52 km NE of the peak of Ajax Hill in the Tombstone Hills, on private land. The Grand Central Mining Co. operated the Emerald and the Silver Plume for most of the productive years. The Emerald had one of the largest ore bodies in the district. The Silver Plume shaft is located in the NE¼NW¼ sec. 23, approximately 50 feet S of the boundary between sec. 14 and sec. 23, 1000 feet SW of the Emerald shaft.
Mineralization is hosted in Abrigo Limestone and Bolsa Quartzite and consisted of partially oxidized base metal sulfides with some Wulfenite and horn silver in fault breccia in limestone and quartzite. Ore control was a N-S dike-fissure, striking N20E and dipping 76W. The ore zone is 335.28 meters long and 3.05 meters wide.
Local structures include the north side of the Ajax Hill Horst, south of the Oregon-Prompter Fault Zone. The Abrigo limestone dips 35 to 45E.
Workings were to a depth of 268.22 meters. The mine has 9 levels. The Silver Plume shaft, 788 feet deep, adjoins to the south. Underground working did not reach the limit of the ore shoot. Work was discontinued because of water. This mine had the largest body of copper ore in the district. Production statistics were included under the Grand Central Mine. Smaller amounts were produced up to 1928. One carload yielded 40% Cu.
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Map Reference: 31°41'20"N , 110°4'8"W
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Mineral List:8 entries listed. 8 valid minerals. 2 type localities (valid minerals).
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