Grand Prize Mine (Grand View Mine), Cottonwood Wash, Cottonwood Peak area, Horse Ranch District, Pinal Co., Arizona, USA
Latitude: 32°53'9"N
Longitude: 110°57'11"W
A former underground Cu-Ag-Au mine located in the NW¼NE¼ sec. 25, T6S, R13E, about 2¾ miles NNW of Cottonwood Hill, on Cottonwood Wash, 1¼ miles S of Tecolote Ranch, on BLM-administered land. Produced 1931-1954. Operators included: E. H. Moores and Sons; W.C. Best; Orval Corman (1954); Charles S. Booth; William G. Fox (1936); and, B.H. Numeyer (1935).
Mineralization is a vein deposit hosted in Ruin (Oracle) Granite. Ore body is tabular, strikes N57E and dips 83SE. There are many veins and streaks, the widest of which is about 3 Feet wide. The mineralization is associated with a Cretaceous-Tertiary intrusive period - easterly striking faults and shears occur throughout the area.
Area structures include NNW-trending thrust faulting through the area. The main fault is the Ripsey Was Fault one mile east. Cretaceous-Tertiary EE-trending hornblende porphyry dikes ½ mile south and SW.
Workings include 3 shafts, 1 - 50 feet deep, 1 - 100 feet deep, and 1 - 70 feet deep; 2 adits, 1 at the 50 foot level, 200 feet in length; and 1 at the 70 foot level, 120 feet in length.
References
Schwartz, Roland J. (1954) General Reconnaissance of the Central Tortilla Mountains, Pinal County, Arizona. MS thesis, University of Arizona, 82pp.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.
Arizona Department of Mineral Resources Grand Prize file.
U.S. Bureau of Mines file data - cluster #1216.
USGS Crozier Peak Quadrangle map.
Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).
MRDS database Dep. ID #10109781, MRDS ID #M241199; and Dep. ID #10186821, MAS ID #0040210486.
Mineral List
2 entries listed. 2 valid minerals.
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