Twin Buttes

Site with commodities copper, molybdenum, silver, zinc, rhenium, uranium

Mines and mineral occurrences in this site

Dataset Feature name Feature type Commodities
Re Twin Buttes Mine Open Pit Mine copper; molybdenum
Re Twin Buttes orebody Deposit copper; molybdenum; silver; zinc; rhenium; uranium
Re Northwest orebody Deposit copper; molybdenum; tungsten; zinc; silver; rhenium
Re Arkose orebody Deposit copper; molybdenum; silver; zinc; rhenium
Re Shaft orebody Deposit copper; molybdenum; silver; zinc; rhenium
Re North Porphyry Contact orebody Deposit copper; molybdenum; silver; zinc; rhenium
Re Northeast orebody Deposit copper; molybdenum; silver; zinc; rhenium
Re Pima District polygon

Detailed information reported for groups of mines or mineral occurrences

Resource estimate summaries

Features Date Description Class Type Material Contained Units
Twin Buttes 1972 Mineable Reserve ore copper 268,200,000 pounds
Twin Buttes 1972 Mineable Reserve ore molybdenum 8,135,400,000 pounds
Twin Buttes 1972 Mineable Reserve ore copper 5,989,800,000 pounds
Twin Buttes 2017 Unclassified ore molybdenum 216,000 metric tons
Twin Buttes 2017 Unclassified ore rhenium 216 metric tons
Twin Buttes 2017 Unclassified ore gold 18,000 kilograms
Twin Buttes 2017 Unclassified ore copper 4,700,000 metric tons

Detailed resource estimates

Twin Buttes, 1972: Mineable Reserve,
Year of estimate 1972
Resource description Mineable Reserve
Material copper
Material type ore
Material amount 447,000,000(includes amounts of more than one commodity)
Amount units tons
Grade 0.03
Grade units percent
Contained commodity 268,200,000
Contained commodity units pounds
Material amount SI 406,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.03
Grade SI units percent
Contained commodity SI 121,700
Contained commodity SI units metric tons
Remarks Oxide ore
Short reference AMAX Inc (1973)Page 18
Reference AMAX Inc., 1973, Annual Report 1972.
Twin Buttes, 1972: Mineable Reserve,
Year of estimate 1972
Resource description Mineable Reserve
Material molybdenum
Material type ore
Material amount 447,000,000(includes amounts of more than one commodity)
Amount units tons
Grade 0.91
Grade units percent
Contained commodity 8,135,400,000
Contained commodity units pounds
Material amount SI 406,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.91
Grade SI units percent
Contained commodity SI 3,690,160
Contained commodity SI units metric tons
Short reference AMAX Inc (1973)Page 18
Reference AMAX Inc., 1973, Annual Report 1972.
Twin Buttes, 1972: Mineable Reserve,
Year of estimate 1972
Resource description Mineable Reserve
Material copper
Material type ore
Material amount 447,000,000(includes amounts of more than one commodity)
Amount units tons
Grade 0.67
Grade units percent
Contained commodity 5,989,800,000
Contained commodity units pounds
Material amount SI 406,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.67
Grade SI units percent
Contained commodity SI 2,716,900
Contained commodity SI units metric tons
Remarks Sulfide ore
Short reference AMAX Inc (1973)Page 18
Reference AMAX Inc., 1973, Annual Report 1972.
Twin Buttes, 2017: Unclassified,
Year of estimate 2017
Resource description Unclassified
Material molybdenum
Material type ore
Material amount 940,000,000(includes amounts of more than one commodity)
Amount units metric tons
Grade 0.023
Grade units weight percent
Contained commodity 216,000
Contained commodity units metric tons
Material amount SI 940,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.023
Grade SI units weight percent
Contained commodity SI 216,000
Contained commodity SI units metric tons
Short reference John and others (2017)Table P2
Reference John, D.A., Seal, R.R., II, and Polyak, D.E., 2017, Rhenium, chap. P of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. P1– P49, http://dx.doi.org/10.3133/pp1802P.
Twin Buttes, 2017: Unclassified,
Year of estimate 2017
Resource description Unclassified
Material rhenium
Material type ore
Material amount 940,000,000(includes amounts of more than one commodity)
Amount units metric tons
Grade 0.23
Grade units grams per metric ton
Contained commodity 216
Contained commodity units metric tons
Material amount SI 940,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.23
Grade SI units grams per metric ton
Contained commodity SI 216
Contained commodity SI units metric tons
Short reference John and others (2017)Table P2
Reference John, D.A., Seal, R.R., II, and Polyak, D.E., 2017, Rhenium, chap. P of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. P1– P49, http://dx.doi.org/10.3133/pp1802P.
Twin Buttes, 2017: Unclassified,
Year of estimate 2017
Resource description Unclassified
Material gold
Material type ore
Material amount 940,000,000(includes amounts of more than one commodity)
Amount units metric tons
Grade 0.019
Grade units grams per metric ton
Contained commodity 18,000
Contained commodity units kilograms
Material amount SI 940,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.019
Grade SI units grams per metric ton
Contained commodity SI 18,000
Contained commodity SI units kilograms
Short reference John and others (2017)Table P2
Reference John, D.A., Seal, R.R., II, and Polyak, D.E., 2017, Rhenium, chap. P of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. P1– P49, http://dx.doi.org/10.3133/pp1802P.
Twin Buttes, 2017: Unclassified,
Year of estimate 2017
Resource description Unclassified
Material copper
Material type ore
Material amount 940,000,000(includes amounts of more than one commodity)
Amount units metric tons
Grade 0.502
Grade units weight percent
Contained commodity 4,700,000
Contained commodity units metric tons
Material amount SI 940,000,000(includes amounts of more than one commodity)
Material amount SI units metric tons
Grade SI 0.502
Grade SI units weight percent
Contained commodity SI 4,700,000
Contained commodity SI units metric tons
Short reference John and others (2017)Table P2
Reference John, D.A., Seal, R.R., II, and Polyak, D.E., 2017, Rhenium, chap. P of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. P1– P49, http://dx.doi.org/10.3133/pp1802P.

History of the site

Features Dates Status Detail Reference
Twin Buttes 1963 to 1967 Exploration Underground development and drilling from cross-cuts and drifts Barter and Kelly (1982)

Geographic context based on the point coordinates