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Mineral Hill Mines (Azurite group; Old Azurite Mine; Copper Glance Mine), Mineral Hill, Mission complex, San Xavier, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 59' 12'' North , 111° 5' 14'' West
Latitude & Longitude (decimal): 31.9866666667, -111.0875
Other regions containing this locality:Sonoran Desert, North America


A former small underground Cu-Ag-Au-Pb-Zn-Mo-W-Wollastonite mine located in the S½ sec. 35, T16S, R12E & the N½ sec. 2, T17S, R12E, 2.2 km W of Helmet Peak on private land. Discovered 1882. Produced 1882-1956. Owned/operated at times, or in part, by the Mineras Consolidated Copper Co., Emporer Copper Co.; Mineral Hill Mining Co.; Copper King Co.; Azurita Copper & Gold Co.; Mineral Hill Consolidated Copper Co.; Barnsdall Corp.; and the Banner Mining Co.

Mineralization is sporadic and irregular, pyrometasomatic and manto replacement ore bodies, partly oxidized, of copper sulfides with minor lead and zinc in garnetized or brecciated Paleozoic limestone, often at fault and fracture intersections and near or on a Laramide intrusive contact. Spotty scheelite and molybdenite with pyrite in garnetized zones. Depth to bottom of ore zone is 213.36 meters.

Local geologic structures include brecciated limestone, fault and fracture intersections and the Mineral Hill Thrust Fault.

Ore graded 3-20% Cu with small amounts of silver. Ore not necessarily confined to garnet-bearing rock. Ore along fault and near granitic intrusives; ore steeply dipping at surface but flattens to nearly horizontal at depth. Wollastonite is described as being "minor" to abundant."

Workings include shaft operations with principal levels at 500, 600, & 700 feet below the collar (IN 1922). Worked sporadically in the 1880's to 1959. Produced an estimated and reported tonnage of over 605,000 tons of ore averaging about 2% Cu, 0.5 oz. Ag/T and minor Au. Subhumed by the much larger Mission pit operation.

Mineral List

Mineral list contains entries from the region specified including sub-localities

30 valid minerals.

Localities in this Region

USA
  • Arizona
    • Pima Co.
      • Sierrita Mts
        • Pima District (Olive District; Mineral Hill District; Twin Buttes District)
          • San Xavier
            • Mission complex

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Mines Handbook (1918, 1920, 1925, 1926, 1931).

Stone, R.W. (1920), Gypsum deposits of the United States, USGS Bull. 697: 52.

Ransome, F.L. (1922), Ore deposits of the Sierrita Mountains, Pima County, Arizona, USGS Bull. 725-J: 407-428.

Elsing, M.J. and Heineman, E.S. (1936) Arizona Metal Production, Arizona Bureau of Mines Bulletin 140.

Mayuga, M.N. (1942) The Geology and Ore Deposits of the Helmet Peak Area, Pima County, Arizona, PhD thesis, University of Arizona.

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

Storms, W.R., and Bowman, A.B. (1957) Mining methods and practices at the Mineral Hill copper mine, Banner Mining Co., Pima County, Ariz.: U.S. Bureau of Mines Information Circular I.C. 7786, 25 p.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 54;

MacKenzie, F.D. (1959) Pyrometasomatic deposits at the Mineral Hill and Daisy mines, in Heindl, L.A., ed., Southern Arizona Guidebook II, combined with the 2nd annual Arizona Geological Society Digest: Arizona Geological Society, p. 193-194.

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.

Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 93-98.

Bowman, A.B. (1963) History, growth and development of a small mining company: Mining Engineering: 15(6): 42-49.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 135 (Table 4).

Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2: 53.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 183, 230, 290, 402.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039575, MRDS ID #M050359; and, Dep. ID #10162108, MAS ID #0040190315.

 
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