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Copperosity Mine (Riesner property; Houston-Arizona Copper Co. property), Cathedral Rock area, Copperosity Hills, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USA

Latitude: 32°33'30"N
Longitude: 112°7'42"W
A former surface and underground Cu-Ag-Zn-Pb-Au-Mo mine located in the E½ sec. 14, T10S, R2E (Vekol Mountains 15 minute topo map), about 2¾ miles ENE of Cathedral Rock. NOTE: Coordinates approximate as interpolated from a map. Discovered 1885. Produced 1890-1917. Claims include the Copperosit Copperosity No. 1 through No. 5, Copperosity Extension, Copperosity Annex and Copperosity Extension No. 5 and No. 6 (MS. 3556). Previous owners and operators include E.J. Bonsall (1890-1906); Copperosity Mining Co. (1907, 1916-17); J.P. Wagnon; Houston-Arizona Copper Co. (1922); and the Chamberlain Co. (1980'S).

Mineralization includes lens-shaped ore bodies hosted in the Abrigo formation limestone as replacement in the limestone along fault zones. Ore control was NE and NW-trending faults. The limestone beds dips 30-50NW. Quartz monzonite dikes are present. Oxidation is strong.

Regional sructures description NE and NW Trending Faults, limestone beds dipping 30-50NW, quartz monzonite dikes. Cretaceous to Tertiary granite occurs ½ mile west of the mine in the Kohakt Valley; granitic dikes reported in ADMR file.

Workings include a two compartment shaft (No. 1) (385 feet deep) with levels at 200 and 300 feet; No. 2 shaft, B shaft and various small prospecting shafts.


Tenny, J.B. (1927-1929) History of Mining in Arizona: 337.

Tenney, J.B. (1934) Economic Geological Reconnaissance of Casa Grande Mining District. Arizona Bureau of Mines: 13-14.

Eising and Heineman (1936) Arizona Bureau of Mines Bulletin 140: 99.

Bureau of Land Management District Sheet 543.

Arizona Bureau of Geology and Mining Technology - U.S. Bureau of Mines file data.

Heindl, L.A. (1965), Mesozoic formations in the Vekol Mountains, Papago Indian Reservation, Arizona, USGS Bull. 1194-G: G2 (Figure 1).

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 14 (Table 1).

USGS Vekol Mountains Quadrangle map.

Arizona Department of Mineral Resources Copperosity file.

Arizona Department of Mineral Resources U file.

MRDS database Dep. ID #10046278, MRDS ID #M241170; and Dep. ID #10210871, MAS ID #0040210267.

Mineral List


6 entries listed. 5 valid minerals.

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