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Mohawk Mine (Mohawk-New Year Mine; Magma Copper Co. property; Mohawk Gold Mining Co. property), Mammoth-Saint Anthony Mine (Mammoth-St Anthony Mine; Mammoth Mine; St. Anthony Mine), St. Anthony deposit, Tiger, Mammoth District, Pinal Co., Arizona, USA
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Mohawk Mine, Mammoth-Saint Anthony Mine, St. Anthony deposit, Tiger, Mammoth District, Pinal Co., Arizona, USA

Photo: Brent Thorne 2007
Latitude: 32°42'14"N
Longitude: 110°40'53"W
A former underground Pb-Cu-Ag-Au-Zn-Mo-V mine located in sec.26, T8S, R16E, on private land. Discovered 1881 by Mr. Frank Schultz and closed 1912. Later produced until 1934. Owned by Mohawk Gold Mining Co. The Mohawk Gold Mining Co. owned just the Mohawk and the Mohawk Wedge patented claims in 1917. Development work was done on the New Year claim, which adjoins the Mohawk claim, in 1926. The Molybdenum Corp. of America obtained control of the New Year and Mohawk properties and carried on underground development of both mines in 1933. Later incorporated into the Mammoth-St Anthony Mine nearby. The headframe of this mine stood until 2003 when it was to be demolished as part of the reclamation of the overall San Manuel Mine property, upon the latter mine's closure.

Mineralization is a vein oxidized to the deepest level. The orebody is tabular. Ore control was veins within shear zones and NW-striking rhyolite intrusions. Alteration was oxidation to a depth of 500 feet with silicification from slight to complete replacement is common but most intense in the veins. Breccia fragments are altered to sericite and clay. Some chloritization. Local structures include Quaternary Gila Conglomerate overlying the ore zone. The Mammoth Fault, striking N22°W and dipping 56° to 70° NE, cuts the veins.

Workings went to about the 500 foot level with the 500 foot deep vertical Mohawk shaft (1906-07). The vertical New Year shaft is 140 feet away. There are 5 levels (all in ore) in the Mohawk, with many cross-cuts, drifts, winzes, and stopes. The New Year shaft workings have crosscut a wide, low grade vein on the 425-foot level. A 30-ton capacity mill was erected.

Mineral List

'Chlorite Group'
var: Cuprian Descloizite

var: Sericite


23 entries listed. 18 valid minerals.

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Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 325-329.

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining. Arizona Bureau of Mines Bull. 137 (revised 1967): 170-174.

Peterson, Nels P. (1938) Geology and Ore Deposits of the Mammoth Mining Camp area, Pinal County, Arizona. Arizona Bureau of Mines Bull. 144: 60-62.

Creasey, S.C. (1965) Geology of the San Manuel area, Pinal County, Arizona, USGS Professional Paper 471: 31.

Rocks & Minerals (1982): 57: 5-10.

U.S. Bureau of Land Management District Sheet #706.

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

Arizona Department of Mineral Resources Magma Copper Co. Active file.

Arizona Department of Mineral Resources St. Anthony Mining and Development Co. file.

Arizona Department of Mineral Resources U file.

USGS Mammoth Quadrangle map.

MRDS database Dep. ID #10048300, MRDS ID M899857; and Dep. ID #10259460, MAS ID #0040210714.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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