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
|Latitude & Longitude (WGS84):||32° 42' 14'' North , 110° 40' 53'' West|
|Latitude & Longitude (decimal):||32.7038888889, -110.681388889|
|Other regions containing this locality:||Sonoran Desert, North America|
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.
20 valid minerals.
This 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 data will improve over time as more accurate maps and data sets are added.
|Quaternary0 - 2.588 Ma||Quaternary sedimentary rocks|
|Mesoproterozoic1000 - 1600 Ma||Middle Proterozoic granitic rocks|
Mostly porphyritic biotite granite with large microcline phenocrysts, with local fine-grained border phases and aplite. Associated pegmatite and quartz veins are rare. This unit forms large plutons, including the Oracle Granite, Ruin Granite, granite in the Pinnacle Peak - Carefree area northeast of Phoenix, and several bodies west of Prescott. (1400-1450 Ma)
~ 1.4 Ga
|Mesoproterozoic1000 - 1600 Ma||Mesoproterozoic plutonic: granite|
References for regional geology:
Data provided by Macrostrat.org
Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .
USGS compilers. State geologic map data. State Maps.
Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.
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.