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Copper Glance Mine (Glance Mine), Stevens Mountain, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 53' 47'' North , 111° 3' 14'' West
Latitude & Longitude (decimal): 31.89639,-111.05389
Other regions containing this locality:Sonoran Desert, North America

‡Ref.: Ransome, F.L. (1922) Ore deposits of the Sierrita Mountains, Pima County, Arizona, in Contributions to Economic Geology (Short Papers and Preliminary Reports), 1921 - Part I.--Metals and Nonmetals except Fuels: U.S. Geological Survey Bulletin 725J: 425-426.

Brown, R.L. (1926) Geology and ore deposits of the Twin Buttes district: Tucson, University of Arizona, M.S. thesis, 40 p.

Webber, B.N. (1929), Marcasite in the contact metamorphic ore deposits of the Twin Buttes district, Pima County, Arizona, Economic Geology 24: 304-310.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 16, 24.

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.

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).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 163, 193, 196, 246, 290.

Twin Buttes Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039587, MRDS ID #M050379; and, Dep. ID #10258946, MAS ID #0040190172.

A former small underground Cu-Ag-Pb-Zn-Au mine located in North-central sec. 6, T.18S., R.13E., ½ mile SE of Twin Buttes. Produced 1916-1957. Owned at times, or in part, by Baxter; the Twin Buttes Mining & Smelting Co.; Bush & Baxter Mining Co.; Glance Mining Co.; Midland Copper Co.; Foy; Amuran Mining Co.; and the Banner Mining Co.

Mineralization is slightly oxidized, near-surface-enriched, large, irregular orebodies of chalcopyrite and other sulfides with skarn minerals and magnetite in selective, pyrometasomatized and brecciated Paleozoic limestone beds along a fault contact with Precambrian granite. Some mineralization was controlled by fissures.

Workings include shaft operations to 182.88 meters deep. Worked intermittently from 1905 through 1957 with a total production of some 186,000 tons of ore averaging about 7% Cu and 1 oz. Ag/T.

Mineral List

13 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Olenekian - Ediacaran
247.2 - 635 Ma
Paleozoic sedimentary rocks

Age: Neoproterozoic to Triassic (247.2 - 635 Ma)

Description: Undivided Paleozoic limestone, dolostone, quartzite, shale, and related sedimentary rocks. (248-544 Ma)

Lithology: Major:{limestone,dolostone,quartzite}, Minor:{shale}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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