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Irish Mag Mine (Calumet and Arizona Mine), Calumet and Arizona group of claims (Calumet and Arizona Mining Company group of claims), Ramsey Canyon, Bisbee, Warren District, Mule Mts, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 25' 53'' North , 109° 54' 33'' West
Latitude & Longitude (decimal): 31.43139,-109.90917
Other regions containing this locality:Sonoran Desert, North America

A former large output underground Cu-Pb-Zn-Au-Ag occurrence/mine located in the center of sec. 16, T23S, R24E, in upper Ramsey Canyon, where Pat Scott and Wisconsin Canyon enter Ramsey Canyon, on private land. Produced 1902-1950. Owned at times, or in part, by the Lake Superior & Western Development Co., Calumet & Arizona Mining Co., and the Phelps Dodge Corp. This was the first Calumet & Arizona mine. Other operators included the Butte & Arizona Mining Co. and the Coronado Investment Co.

Mineralization is partly oxidized copper and minor lead-zinc ores in irregular replacement bodies associated with strong fracturing and faulting in relatively unaltered Devonian Martin and Cambrian Abrigo Limestones. Ore control was dikes and sills near the ore bodies and faulting and associated brecciation. Ore concentration was bornite replacing pyrite. Alteration was gossan with Mn and Fe oxides induced by hydrothermal metamorphism. An associated rock unit is the Sacramento Hill Stock.

Local structures include common pre-mineralization tilting and pre-mineralization faulting. The main pre-mineralization fault directions are N10W to N40E, S30W to N50W.

Workings include a shaft(s), a 200 foot tunnel driven in the early 1900'S. Three principal adits, including this tunnel, pits, and small prospect drifts.

This was the first Calumet & Arizona mine with over 1.5 million tons of ore produced since 1902.

Mineral List

10 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Kungurian - Moscovian
272.3 - 315.2 Ma
Permian to Pennsylvanian sedimentary rocks

Age: Paleozoic (272.3 - 315.2 Ma)

Stratigraphic Name: Hermit Formation; Supai Group; Schnebly Hill Formation; Naco Group

Description: Interbedded sandstone, shale, and limestone usually characterized by ledgy outcrops. Orange to reddish sandstone forms cliffs near Sedona. This unit includes Supai Group and Hermit Shale in northern Arizona and Naco Group in southern Arizona. It was deposited in coastal-plain to shallow-marine settings during time of variable and changing sea level. Rocks of this map unit in southern Arizona may be in part equivalent to Permian rocks of map unit P in central and northern Arizona. (280-310 Ma)

Lithology: Major:{sandstone,shale,limestone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.


Ransome, F.L. (1904a), The geology and ore deposits of the Bisbee quadrangle, Arizona: U.S. Geological Survey Professional Paper 21, 168 p., 3 sheets, scales 1:12,000 and 1:62,500: 111-112.

Bonillas, Y.S., Tenny, and Feuchere (1917), Geology of the Warren mining district: A.I.M.E. Transactions, Vol. 55: 284-355: 329.

Weber, R.H. (1950), The Geology of the East-central Portion of the Huachuca Mountains, Arizona, University of Arizona, PhD. Thesis.

Bryant, D.G. & R.A. Metz (1966), Geology and ore deposits of the Warren mining district, in Titley, S.R. and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: 189-203, University of Arizona Press: 191, 200-201.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 88 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 228.

U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0040030633.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10046239, MRDS ID #M241104; #10088888, MRDS ID #M800316; and #10209783.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.

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