‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 37.
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1093.
Church, J.A. (1903) The Tombstone, Arizona, mining district: American Institute of Mining Engineers, Transactions: 33: 3-37: 24, 33.
Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.
Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, Arizona, Arizona Bureau of Mines Bull. 143: 51, 84-89, 98, Pl. III, IV.
Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 16.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 43, 53, 64, 65, 101.
Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 75 (Table 4).
Traywick, Bent. (1983), The Mines of Tombstone.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 131, 151, 162, 223, 247, 261, 331, 356, 372, 385, 386.
Arizona Bureau of Mines files.
MRDS database Dep. ID file #10027124, MRDS ID #M002173; and, Dep. ID #10161237, MAS ID #0040030608.
A former small underground Ag-Pb-Cu-Zn-Mo-Fluorspar mine located in the East-center sec. 11, T.20S., R.22E, ¼ mile S of Tombstone, on private land. One of Tombstone's first producers, from both the Empire and Toughnut shafts. Owned at times, or in part, by the Tombstone Mill & Mining Co., Tombstone Consolidated Mines Co., Bunker Hill Mines Co., and the Tombstone Development Co.
Mineralization is a replacement deposit with oxidized base metal sulfides and minor wulfenite in irregular pipes and bedded deposits in Cretaceous Bisbee Group limestone along a series of anticlinal rolls cut by the strong Empire Dike filled fault and 'northeast' fissures. The ore zone is 609.6 meters long. Alteration is recrystallized limestone and silicification.
Workings include shaft(s), of which the main shaft is 450 feet deep. Workings total 1219.2 meters long and 152.4 meters deep. Over 10,000 tons of ore were produced in the late 1800's but output was included with adjoining mines. Output statistics were included with the Toughnut and Empire, and Tombstone group.
CAUTION: The Empire Mine workings are deteriorated and VERY hazardous - DO NOT ATTEMPT ENTRY!
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Map Reference: 31°42'27"N , 110°3'39"W
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