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Las Trajas Mine (Arizona Copper Co. property [in part]), Pinkaro Gulch, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA

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A former surface and underground Cu-Au-Ag mine located in the SE¼NE¼ sec. 7, T4S, R29E, at the head of Pinkaro Gulch, on the prominent ridge to the east of the head of Copperplate Gulch, 2.0 miles NW of Morenci open pit; 2.75 miles SW of Metcalf, on private land. Alternate coordinates provided: 33.0028N, 109.3944W. Owners included the Arizona Copper Co. Ltd.


Mineralization is a tabular ore body. The vein is accompanied E of the shaft by a porphyry dike that reaches widths of 200 feet and does not seem to follow the fault fissure. Associated rock unit is the Coronado Quartzite. The vein is located on a subordinate fault fissure. Ore concentration is mineralization along fissure veins with some surface leaching. Alteration is surface oxidation.

The majority of the fissure veins in this region contain oxidized copper ores in their upper levels. Area structures include block faulting south of the Great Coronado Fissure vein with a downthrow of 1200 feet on the southern side and gentle westward dip.

Tectonic component is the Coronado Granite Massif surrounded by peripheral faults.

Workings achieved a depth of 30.48 meters. Developments included one shaft 100 feet deep and several surface cuts. Ores have been stoped along surface cuts to a width of 3 feet. No production data.

Mineral List



3 entries listed. 2 valid minerals.

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References

Lindgren W. (1905) The Copper Deposits of the Clifton-Morenci District, Arizona. USGS Professional Paper 43: 363.

USGS Geologic Atlas Clifton Folio Arizona (1905) - Economic Geology Map.

Cleland, Robert G. (1952) A History of Phelps Dodge.

Dunning, C.H. (1959) Rock to Riches.

Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.

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

U.S. Bureau of Mines files, Las Trajas Mine.

USGS Clifton Quadrangle map.

MRDS database Dep. ID #10048282, MRDS ID #M800407; and Dep. ID #10186724, MAS ID #0040110132.

 
Mineral and/or Locality  
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