Latitude: 33°24'25"N
Longitude: 110°52'30"W
A former surface and underground Cu-Ag-Au-Mo mine located in the S½ sec. 19, T1N, R15E (Globe 7.5 minute topo map), 2 kilometers NE of Miami, 3 kilometers E of the Miami-Inspiration sites. Discovered 1969. Operated by the Cyprus Miami Operators. Magma Copper Co. was the owner/operator (1987-1996), followed by Broken Hill Proprietary Co. Ltd. (1996-____). Owned by Pinto Valley Copper Corp. a subsidiary of Newmont Mining; and by the Cyprus Minerals Co. NOTE: MRDS file 10048778 provides an obviously erroneous longitude of 110°44'24", which places the locality E of Globe; the longitude value presented in MRDS file 10184420 is presented in this file; however, even though it is less inaccurate, it definately appears to be somewhat erroneous, placing the deposit too far west, about 1 mile NW of Miami, and too close to the Miami-Inspiration workings.
Mineralization is a hydrothermal vein deposit with an irregular ore body hosted in Schultze Granite and Precambrian Pinal Schist. The ore zone is 920 meters long, 427 meters wide, 72 meters thick, with a depth-to-top of 760 meters, striking N72E and dipping 34N. Ore control was within and around the granite. Alteraton was silicic, potassic, argillic, sericitic, and propylitic.
The in place grade of the ore is 3.14% Cu; after mining (dilution) the grade is 2.8%. A new grade for molybdenum has also been estimated based on the new Miami East feed to the mill. Ore must be blended with the Pinto Valley ore before milling. Development at Miami East suspended indefinately as of January 7, 1987.
Workings are 956 meters deep.
References
Ridge, John D. (1967) (editor). Ore Deposits in the United States 1933-1967, A.I.M.E. Graton Sales, Volume 1 & 2.
Creasey, S.C. (1980) Chronology of Intrusion and Deposition of Porphyry Copper Ores, Globe-Miami District, Arizona. Economic Geology: 75: 830-844.
Gilmour, Paul (1982) Grades and Tonnages of Porphyry Copper Deposits, in Titley, S.R., editor, Advances in Geology of the Porphyry Copper Deposits Southwestern North America: Tucson, University of Arizona Press: 736.
Keith, Stanton B., D.E. Gest, Ed DeWitt, N.W. Toll & B.A. Everson (1983), Metallic mineral districts and production in Arizona: Arizona Bureau of Geology & Mineral Technology Bull. 194, 58 pp.: Map 18 in pocket.
Mining Annual Review (1985): 329.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 7 (Table 1).
MRDS database Dep. ID #10048778, MRDS ID #MP90002; and Dep. ID #10184420, MRDS ID #M003084, MAS ID #0040070051.
Mineral List
14 entries listed. 13 valid minerals.
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