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Tranquility Mine (Tranquility shaft), Contention-Grand Central Mine group, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 42' 28'' North , 110° 3' 43'' West
Latitude & Longitude (decimal): 31.7077777778, -110.061944444
Other regions containing this locality:Sonoran Desert, North America

A former small underground Ag-Au-Pb-Cu-Zn mine located in T.20S., R.22E, on private land. Owned at times, or in part, by the Western Mining Co., Grand Central Mining Co., Tombstone Mill & Mining Co., Head Center Co., Head Center & Tranquility Co., Contention Mining Co., Tombstone Consolidated Mines Co., Bunker Hill Mines Co., and the Tombstone Development Co.

Mineralization is oxidized argentiferous and auriferous galena and minor copper and zinc ores in large, rich orebodies in faulted and fractured segments of a large dike, and in brecciated footwall zones of the dike. Ore was also found in replacements of Cretaceous Bisbee Group limestone beds where intersected by "northeast" fissures. The host rock unit is the Bisbee Group. Ore control was NE-trending fissures.

Local structures include the Tombstone Basin with post-mineralization tilting to the NNE.

Workings included extensive shaft. The shaft adjoins the Empire shaft to the north and the Silver Thread shaft to the northeast. There were 3 levels from the shaft with the 1st level being the most extensive. One of the earliest and most productive mines of the district. Over $10,000,000 was produced prior to 1886 and several hundred thousand tons were produced from the 1880's to the early 1900's. There was some sporadic production up to 1929. Production was included under the Tombstone group.

Mineral List

3 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Prescott, AZ: 38.

Blake, W.P. (1882) The geology and veins of Tombstone, Arizona: American Institute of Mining Engineers, Transactions: 10: 334-345; also Engineering and Mining Journal: 33: 145-146, 157, 231-232, 328; and, vol. 34: 335-339, 342-343.

Church, J.A. (1903) The Tombstone, Arizona, mining district: American Institute of Mining Engineers, Transactions: 33: 3-37: 4, 8, 11-12, 16, 18-20, 23-25, 28, 33-34.

Jones, Jr., E.L. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: Plate V.

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: 41, 43-45, 51, 69-71, Pl. IV, VIII, IX.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 74.

Arizona Bureau of Mines files.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 278.

MRDS database Dep. ID file #10027014, MRDS ID #M001719.

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