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Copperstone Mine (Copperstone Open pit; Continental Silver Claim group; Copperstone Underground Mine), La Paz Mining District (Weaver Mining District), Dome Rock Mountains, La Paz Co., Arizona, USAi
Regional Level Types
Copperstone Mine (Copperstone Open pit; Continental Silver Claim group; Copperstone Underground Mine)Mine
La Paz Mining District (Weaver Mining District)Mining District
Dome Rock MountainsMountain Range
La Paz Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 52' 24'' North , 114° 17' 23'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Poston285 (2011)16.3km
Quartzsite3,626 (2017)23.9km
Bouse996 (2011)27.0km
Big River1,327 (2011)30.4km
Parker3,046 (2017)30.8km


Refs.: Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.

Walenga, Karen (1987) New Operation to Double Arizona Gold Production: Southwestern Pay Dirt, No. 581: 4A-5A.

Spencer, J.E., Duncan, J.T., and Burton, W.D. (1988), The Copperstone Mine: Arizona’s New Gold Producer. Arizona Bureau of Geology and Mineral Technology Field Notes, vol. 18(2): 1-3.

Walenga, Karen (1988) Cyprus Starts Work on Underground Mine at Copperstone: Southwestern Pay Dirt, No. 592: 5A.

Minerals Today, US Bureau of Mines (Jan, 1990): 26.

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.

Peterson, E.K. and Dupree, J.A. (1993) Preliminary Investigation of Bulk Minable Gold Deposits, Colorado River Indian Reservation, Arizona and California, in: Manydeeds, S.A., and Smith, B.D., editors, Mineral Frontiers on Indian Lands: Bureau of Indian Affairs Division of Energy and Mineral Resources: 35-42.

MRDS database Dep. ID file #10056413, MRDS ID #TC00084; and, Dep. ID #10259110, MAS ID #0040120006.

A large former Au-Ag-Baryte (trace) property located in the NE¼ sec. 12, T6N, R20W, 18 miles S of Parker on the E side of the Colorado River, 12 miles N of Quartzsite, on BLM-administered land. The site consists of 290 unpatented mining claims leased by Cyprus, covering 5800 acres of federal land. Discovered 1979. First produced 1987. Owned by Cyprus Gold Co., a subsidiary of the Cypress Minerals Co. (Don Patch retains royalty rights)(1988). Operated by Morrison-Knudsen(1989).

Mineralization is a tabular deposit striking N30W and dipping 32NE with ore control by faults and brecciation and detachment faulting. Alteration is sericitization and some chloritization. Local structures include a probable fault separating Jurassic metamorphosed volcanic rocks and overlying sedimentary breccias derived from them. Moon Mountains Detachment Fault. The presence of quartz, hematite, and chrysocolla is a good indicator of gold mineralization.

The gold is in a breccia unit above a listric fault, in quartz latite below the listric fault, and in basalt plugs. The basalt plugs have the least mineralization. The listric fault is in the upper plate of a detachment fault. The mineralized contact zone extends horizontally for 3,000 feet (914.4 meters) and at least 1,000 feet down dip and is generally several tens of feet thick.

This mine will feature an open pit and development of an underground mine. The bench open pit will be 360 feet deep. Produced 1,953 kg Au (1988).

The life of this project is estimated at 7-9 years. No previous mining occurred at this site. Underground development was stopped by Cyprus in 1990 due to lower gold prices and because of caving ground conditions which required costly support methods. Cyprus may consider reaching the former underground mining targets from the surface. Copperstone was to have been the largest gold producer in Arizona and will more than double the state's 1986 gold output of 42,556 oz.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: MRDS database Dep. ID #10259110, MRDS ID #TC00084; MAS ID #0040120006.
Baryte
Formula: BaSO4
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Calcite
Formula: CaCO3
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Chalcopyrite
Formula: CuFeS2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
'Chlorite Group'
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Fluorite
Formula: CaF2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Goethite
Formula: α-Fe3+O(OH)
Reference: MRDS database Dep. ID #10259110, MRDS ID #TC00084; MAS ID #0040120006.
Gold
Formula: Au
Reference: Mins. Today, US Bur. Mines(Jan90):26.
Hematite
Formula: Fe2O3
Reference: MRDS database Dep. ID #10259110, MRDS ID #TC00084; MAS ID #0040120006.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: MRDS database Dep. ID #10259110, MRDS ID #TC00084; MAS ID #0040120006.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Pyrite
Formula: FeS2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Pyrolusite
Formula: Mn4+O2
Reference: MRDS database Dep. ID #10259110, MRDS ID #TC00084; MAS ID #0040120006.
Quartz
Formula: SiO2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.
Quartz var: Amethyst
Formula: SiO2
Reference: MRDS database Dep. ID file #10056413, MRDS ID #TC00084.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Chlorite Group'-
Kaolinite-Al2(Si2O5)(OH)4
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
Quartz
var: Amethyst
-SiO2

List of minerals for each chemical element

HHydrogen
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H MalachiteCu2(CO3)(OH)2
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Goethiteα-Fe3+O(OH)
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O Quartz (var: Amethyst)SiO2
O BaryteBaSO4
O CalciteCaCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O KaoliniteAl2(Si2O5)(OH)4
O PyrolusiteMn4+O2
O QuartzSiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F FluoriteCaF2
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Quartz (var: Amethyst)SiO2
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
S BaryteBaSO4
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca FluoriteCaF2
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe MagnetiteFe2+Fe23+O4
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
CuCopper
Cu ChalcopyriteCuFeS2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

Other Databases

USGS MRDS Record:10056413

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

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