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Vekol Hills project (Vekol Hills; Newmont Vekol), Vekol District, Vekol Mts, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USA
Chlorargyrite
Vekol Hills project, Vekol District, Vekol Mts, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USA
Photo: R.D.Green
Vekol Hills project, Vekol District, Vekol Mts, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USA
Photo: R.D.Green
Latitude: 32°35'21"N
Longitude: 112°3'14"W
Longitude: 112°3'14"W
Mineralization is hypogene enrichment with minor oxidation and supergene enrichment. The ore zone strikes N45E and dips 10W, at 259.08 meters thick, 106.68 meters depth-to-top, 670.56 meters wide and 914.4 meters long. Precambrian through Devonian age rocks were mineralized by solutions associated with Laramide porphyries. The porphyries themselves contain only minor mineralization. Oxidation and supergene enrichment are relatively minor. Ore control was diabase and sedimentary rocks near the contact of Laramide stock, and fracturing. Host rock unit is Pinal Schist; the Apache group; Martin Limestone; Bolsa Quartzite and the Abrigo formation. Related structures are major fracture control complex faulting and tilting. The mineralized area covers about a quarter section on the easterly sloping pediment at the NE edge of the Vekol Mountains.
Ore reserves were estimated at 45,351,000 metric tons of ore (1978).
Mineral List
| Bornite Chalcocite Chalcopyrite Chlorargyrite | Chrysocolla Fornacite Gold Hematite | Kaolinite Limonite Malachite Molybdenite | Pyrite Quartz Silver Sphalerite |
16 entries listed. 15 valid minerals.
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References
Skillings Mining Review (1970), Dec 26, 70: 1.
World Mining (1971), April 1971: 48.
World Mining (1976) June, 1976: 44.
Chaffee, Maurice A. (1977), Geochemical exploration techniques based on distribution of selected elements in rocks, soils, and plants, Vekol porphyry copper deposit area, Pinal County, Arizona: USGS Bulletin 1278-E.
Paydirt (1977), July 1977: 1.
World Mining (1977), September, 1977: 172.
U.S. Department of the Interior, Bureau of Indian Affairs (1977) Vekol Hills Project, Papago Indian Reservation, Pinal County, Arizona: U.S. Department of Interior, Bureau of Indian Affairs, 227 p.
Papago Indian Reservation, Pinal County, Arizona, Bureau of Indian Affairs (1977), 5/18/77: 6.
Draft Environmental Impact Statement - Vekol Hills project.
Greely (1978) Arizona Department of Mineral Resources Special Report 2: 83-87.
Steele (1978) Arizona Geological Society Digest, Vol. 11: 36.
New Mexico Paydirt (1979) U.S. Copper Production could be Increased by 53 Percent in 1980's, Survey Shows, May, 1979: 58.
Vekol Hills Project EIS, U.S. Department of the Interior (1988).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 15 (Table 1).
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
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.
MRDS database Dep. ID #10046282, MRDS ID #M241177; and Dep. ID #10234917, MAS ID #0040210003.
World Mining (1971), April 1971: 48.
World Mining (1976) June, 1976: 44.
Chaffee, Maurice A. (1977), Geochemical exploration techniques based on distribution of selected elements in rocks, soils, and plants, Vekol porphyry copper deposit area, Pinal County, Arizona: USGS Bulletin 1278-E.
Paydirt (1977), July 1977: 1.
World Mining (1977), September, 1977: 172.
U.S. Department of the Interior, Bureau of Indian Affairs (1977) Vekol Hills Project, Papago Indian Reservation, Pinal County, Arizona: U.S. Department of Interior, Bureau of Indian Affairs, 227 p.
Papago Indian Reservation, Pinal County, Arizona, Bureau of Indian Affairs (1977), 5/18/77: 6.
Draft Environmental Impact Statement - Vekol Hills project.
Greely (1978) Arizona Department of Mineral Resources Special Report 2: 83-87.
Steele (1978) Arizona Geological Society Digest, Vol. 11: 36.
New Mexico Paydirt (1979) U.S. Copper Production could be Increased by 53 Percent in 1980's, Survey Shows, May, 1979: 58.
Vekol Hills Project EIS, U.S. Department of the Interior (1988).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 15 (Table 1).
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
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.
MRDS database Dep. ID #10046282, MRDS ID #M241177; and Dep. ID #10234917, MAS ID #0040210003.
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Locality Updated: Blackjack Mine, Beetown, Upper Mississippi Valley District, Grant Co., Wisconsin, USAFrom Debbie Woolf, 20th Jun 2013 10:11:23