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Florence project, Florence, Florence District (Blackwater District; Black Rock District), Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 2' 35'' North , 111° 26' 21'' West
Latitude & Longitude (decimal): 33.04306,-111.43917
GeoHash:G#: 9tbgbpk3z
Owned/operated by:Taseko
Locality type:Project (Planned Future Operation) - last checked 2018
Köppen climate type:BSh : Hot semi-arid (steppe) climate

A Cu-Mo deposit located in secs. 28 & 33, T4S, R9E, about 2½ miles WNW of Florence on/near the Gila River, on private land. Discovered in 1969. Previously owned by Conoco. Aztec Exploration and development was the operator in 1970. Was owned by the E. I. Dupont De Nemours and Co. (1982). NOTE: MRDS states deposit lies in the "Blackwater District."

Mineralization is a massive porphyry copper deposit hosted in Ruin (Oracle) Granite. The ore body is 107 meters depth-to-top and 503 meters thick. Andesite intrudes the granite. The quartz monzonite was emplaced into Precambrian host rocks. Ore control was fracturing and brecciation. Alteration was hydrothermal resulting in sericitization and kaolinization.

A pilot plant was under construction in 1974.

Assay data: The ore is 0.5% Cu, 90% recovery projected.

A test facility is being built currently (2018) for in-situ copper recovery.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

9 valid minerals.

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Cox, D.P., unpublished data.
Wilson, E.D. (1969) Mineral Deposits of the Gila River Indian Reservation, Arizona. Arizona Bureau of Mines Bull. 179, 34 pp.
Mining Record (1974) Arizona Copper Project near Completion: Project Manager Named.
Yeend (1976) USGS Map MF-778.
Ullmer (1978) Journal of Geochemical Exploration: 9(2-3): 235-236.
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
MRDS database Dep. ID #10096172, MRDS ID #W002694.


Title (click to view)YearAuthor
Florence Copper Project Technical Report2017Taseko
The Olympic Dam Mega-Expansion Without Uranium Recovery 2010Dr Gavin M. Mudd

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