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Copper Butte Mine (Copper Buttes Copper Mines), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USAi
Regional Level Types
Copper Butte Mine (Copper Buttes Copper Mines)Mine
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District)Mining District
Sierrita MountainsMountain Range
Pima Co.County

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Latitude & Longitude (WGS84):
31° 53' 42'' North , 111° 3' 56'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Green Valley21,391 (2011)8.2km
Sahuarita25,707 (2017)12.5km
East Sahuarita1,622 (2006)14.0km
Arivaca Junction1,090 (2011)18.6km
Amado295 (2011)20.8km

Ref.: Cummings, J.B., and Romslo, T.M. (1950) Investigation of Twin Buttes copper mines, Pima County, Ariz.: U.S. Bureau of Mines Report of Investigations R.I. 4732, 32 p.

Cooper, J.R. (1960) Some geologic features of the Pima mining district, Pima County, Arizona: U.S. Geological Survey Bulletin 1112-C, p. 63-103, 1 sheet, scale 1:31,680.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 133 (Table 4).

USGS Twin Buttes Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10108966, MRDS ID #M000091; and, Dep,. ID #10234806, MAS ID #0040190171.

A former small underground Cu-Ag mine located in the SE ¼ sec. 36, T.17S., R.12E., ¼ mile west of the town of Twin Buttes, on private land. Produced 1918-1935. Owned/operated at times, or in part, by Twin Buttes Mining & Smelting Co.; Bush & Baxter; Lee S. Wood; Jesus Oritz; and, Foy.

Mineralization is a small zone of chalcopyrite in fractured, garnetized, Paleozoic limestone near, or at, a fault contact with Precambrian granite at the border of the Minnie claim. Other slightly mineralized, garnetiferous zones occur eastward along the limestone-granite fault contact.

Local structures include a NW-trending fault just to the north of the mine.

Workings include shaft operations from the Minnie Mine and Butte shaft. Possibly some 200 tons of ore, averaging about 3% Cu were produced in 1929.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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

Mineral List

1 valid mineral.

Detailed Mineral List:

Formula: CuFeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 133 (Table 4); Cummings & Romalo (1950); Arizona Bureau of Mines file data.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 133 (Table 4); Cummings & Romalo (1950); Arizona Bureau of Mines file data.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Unclassified Minerals, Mixtures, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

O Garnet GroupX3Z2(SiO4)3
Si Garnet GroupX3Z2(SiO4)3
S ChalcopyriteCuFeS2
Fe ChalcopyriteCuFeS2
Cu ChalcopyriteCuFeS2

Other Databases

USGS MRDS Record:10108966

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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