Cuprite group, Santa Rosa Gulch, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA
|Latitude & Longitude (WGS84):||33° 7' 58'' North , 109° 23' 30'' West|
|Latitude & Longitude (decimal):||33.1327777778, -109.391666667|
A former underground Cu-Ag-Au mine located in the NW¼NW¼ sec. 32, T3S, R29E, 2.0 miles NW of Metcalf at the head of Santa Rosa Gulch, on private land. The property is comprised of 16 patented and 10 unpatented claims totalling 490 acres. Discovered in 1875 by Isaac Stevens. Cuprite group claims extend into the S½ of sec. 29, the SE corner of sec. 30, and the E½ of sec. 31. Produced 1905-1916. Operators included E.T. Morton; Isaac N. Stevens; and the Cuprite Copper Co. Cuprite Copper Co. dissolved in 1925 with no further records of the property.
Mineralization is an irregular ore body 30.48 meters wide. An associated rock unit is the Precambrian granite basement. Ore control was surface outcrops; the leached zone carries isolated pockets of rich ore; and the NE-trending fissure veins. Ore concentration involves surface leaching to considerable depths (200 to 400 feet); mineralization along fissure veins. Alteration is sericitization of orthoclase and the formation of NW- and E-trending quartz vein systems. The property also included 2000 linear feet of strong hematitic outcrops which range from 5 to 100 feet in width.
Geology is similar to the Coronado vein. Quartzitic veins are accompanied by irregular masses of a fine-grained rock which are possibly inclusions of older Precambrian sediments into intrusive granite. Age of mineralization roughly contemporaneous with fissure vein formation in Morenci Granite Porphyry to the S and E.
Area structures include veins that form quartz-filled streaks in granite without porphyry dikes. Ores occur in granite along the vein and in quartz accompanying the deposit.
Tectonic component is the Coronado Massif surrounded by peripheral faults; fault block to the east of the massif is downthrown about 2000 feet.
Workings total 124.97 meters in length and achieved a depth of 97.54 meters. Developments included 2 shafts of 30 feet and 320 feet deep; 2 tunnels of 150 feet and 260 feet in length. 1913 assay values ranged from 15 to 30% Cu.
5 valid minerals.
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 Macrostrat.org
|Calymmian - Statherian|
1400 - 1800 Ma
|Proterozoic granitic rocks|
Age: Proterozoic (1400 - 1800 Ma)
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. 
Weed, W.H. (1914) The Copper Handbook: Vol. XI: 303, Cuprite Copper Co.
Weed, W.H. (1922) The Mines Handbook, Vol. XV: 261, Cuprite Copper Co.
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.
MRDS database Dep. ID #10048293, MRDS ID #M800427.