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Poston Butte deposit (Continental Oil Co. property; Aztec Exploration and Development Co. property; Florence Conoco; Florence Copper Co. property), Florence, Florence District (Blackwater District; Black Rock District), Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 3' 40'' North , 111° 24' 32'' West
Latitude & Longitude (decimal): 33.06116,-111.40899
GeoHash:G#: 9tbu0fd7n
Locality type:Deposit (Inactive) - last checked 2018
Köppen climate type:BSh : Hot semi-arid (steppe) climate

A Cu deposit located in the NW¼ sec. 33, T4S, R9E (Florence 7.5 minute topo map), about 3¼ miles WNW of Florence, on the N side of the Gila River. Previously owned by the Continental Oil Co. - Conoco, of Colorado (1980).

Further exploration by BHP Billiton in the 1990s.

Mineralization is a porphyry copper orebody. Mineralization includes secondary copper minerals.

Commodity List

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

Mineral List

22 valid minerals.

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 15 (Table 1).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 370.
Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.
Skillings Mining Review ( ) Conoco Oil Discovers Copper Minerals in Arizona: 59(44), 65(3), 66(1).
USGS Florence Quadrangle map.
Arizona Department of Mineral Resources Continental Oil Co. [Florence project] Active file.
MRDS database Dep. ID #10137610, MAS ID #0040210245.

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