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Defense Mine (Northwest shaft; Northwest Mine), Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

Latitude: 31°42'28"N
Longitude: 110°4'5"W
‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 38.

Blake, W.P. (1882) The geology and veins of Tombstone, Arizona: American Institute of Mining Engineers, Transactions: 10: 343.

Church, J.A. (1903) The Tombstone, Arizona, mining district: American Institute of Mining Engineers, Transactions: 33: 12, 21-23.

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: 89, 99.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 75 (Table 4).

MRDS database Dep. ID file #10046213, MRDS ID #M241065.

A former small surface and underground Ag-Pb-Au mine located in South-central sec. 11, T.20S., R. 22E, approximately 1/3 mile south of Tombstone, on private land. 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 vein deposit with oxidized argentiferous lead mineralization along the Defense fissure zone where it intersects crossing rolls in favorable Cretaceous Bisbee Group beds. The Bisbee Group limestone is recrystallized. Sand and shale were converted to hornfels prior to mineralization.

Workings include both surface and underground workings. A few thousand tons of ore were produced. Production statistics were included under the Tombstone group.

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