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Commonwealth Mine (Pearce Mine; Silver Ware Mine; Brockman Mine; Smith Mine; Rinaud Mine; Ritter Mine; Eisenhart vein), Pearce, Pearce Mining District, Pearce Hills, Sulphur Springs Valley, Cochise County, Arizona, USAi
Regional Level Types
Commonwealth Mine (Pearce Mine; Silver Ware Mine; Brockman Mine; Smith Mine; Rinaud Mine; Ritter Mine; Eisenhart vein)Mine
Pearce- not defined -
Pearce Mining DistrictMining District
Pearce HillsGroup of Hills
Sulphur Springs ValleyValley
Cochise CountyCounty
ArizonaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
31° 54' 3'' North , 109° 48' 56'' West
Latitude & Longitude (decimal):
31.90111,-109.81556
GeoHash:
G#: 9t9vmp6v2
GRN:
N22W67
Type:
Mine
Köppen climate type:
BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Sunizona281 (2011)15.4km
Dragoon209 (2011)25.3km
Elfrida459 (2011)26.9km
Tombstone1,312 (2017)31.7km
McNeal238 (2011)36.1km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Sunsites Gem and Mineral ClubPearce, Arizona1km
Mindat Locality ID:
10260
Long-form identifier:
mindat:1:2:10260:2
GUID (UUID V4):
2025b7e8-dfff-49a5-a387-b5ceae53cd7c


A former small underground Ag-Au-Mo-Cu-Pb-V-Silica mine located in the NE¼ sec. 5, T.18S., R.25E, 1/2 mile E of Pearce, on private land. Discovered by John Pearce in 1895. Produced 1895-1979. One of Arizona's major silver producers. Owned at times, or in part, by the C.O.R. Ford Corp. of Dallas, TX (1979); Commonwealth Mining and Milling Co.; Montana Tonopah Mining & Milling Co.; and the Commonwealth Development Co. Operated by GOURMET CHIEF INC. (1975). Additional names associated with this mine: Main Mine, North Mine, Hartery veins, Footwall Mine, Discovery stope.

Mineralization is irregular silver-gold halides and minor sulfo-salts with some manganese in quartz-calcite fissure veins and in fault breccia zones (on the hanging wall) in silicified Tertiary rhyolite and andesite volcanics. The ore zone is 1,219.2 meters long, 106.68 meters wide, depth to bottom of 152.4 meters, and 18.29 meters thick, striking N-S (main vein), and dipping 60E. Alteration is propylitic, silicification, and oxidation. It is more intense in and near vein fractures. Sericitic and K-feldspar alteration exists closest to the veins, with extensive argillic and propylitic alteration away from the veins. The associated rock units are the Pearce volcanics and the Brockman Andesite.

Local structures include volcanic flows that dip 35-40E. Fissure veins and fault breccia zones; N-S faults are pre-mineralization, others are post-mineralization.

Workings include a shaft(s). Two inclined shafts, 62 degrees, with extensive workings on 8 levels. The water level was at 700 feet, and a majority of mining was done above the water table, although shaft "C" was eventually sunk to 1,000 feet. There are about 20 miles of underground workings. The workings are 9,144 meters long in total and 152.4 meters deep. Over 1,000,000 tons of ore were produced from 1895 to 1942. Tailings being reworked, 1976-19, flotation methods. Intermittent shipments of tailings were made in the mid-1980'S. About 100,000 tons of tailings had been sold for use as high-silica smelter flux. It is estimated that up to a million tons of tailings remained. In addition, there are approximately 150,000 tons of mine dump material in the area that average 2.5 oz of Ag/t.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


32 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Acanthite
Formula: Ag2S
ⓘ Alunite
Formula: KAl3(SO4)2(OH)6
ⓘ Aurichalcite ?
Formula: (Zn,Cu)5(CO3)2(OH)6
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Bromargyrite
Formula: AgBr
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcocite
Formula: Cu2S
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Chlorargyrite
Formula: AgCl
ⓘ Chlorargyrite var. Bromian Chlorargyrite
Formula: Ag(Cl,Br)
ⓘ 'Chlorite Group'
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ Conichalcite
Formula: CaCu(AsO4)(OH)
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Fluorite
Formula: CaF2
ⓘ Galena
Formula: PbS
ⓘ Gold
Formula: Au
Description: Occurs as broad splotches & leaf forms.
ⓘ Gypsum
Formula: CaSO4 · 2H2O
ⓘ Hematite
Formula: Fe2O3
ⓘ Iodargyrite
Formula: AgI
ⓘ Jarosite
Formula: KFe3+3(SO4)2(OH)6
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ 'K Feldspar'
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
ⓘ 'Limonite'
ⓘ Mimetite
Formula: Pb5(AsO4)3Cl
ⓘ 'Mimetite-Pyromorphite Series'
ⓘ Molybdenite
Formula: MoS2
ⓘ Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Plattnerite
Formula: PbO2
ⓘ Proustite
Formula: Ag3AsS3
ⓘ Pyrite
Formula: FeS2
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Amethyst
Formula: SiO2
ⓘ Quartz var. Chalcedony
Formula: SiO2
ⓘ Rhodochrosite
Formula: MnCO3
ⓘ Sanidine
Formula: K(AlSi3O8)
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Siderite
Formula: FeCO3
ⓘ Silver
Formula: Ag
ⓘ 'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S
ⓘ 'Wad'
ⓘ Wulfenite
Formula: Pb(MoO4)
Description: Occurs lining cavities with embolite.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘSilver1.AA.05Ag
ⓘGold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘAcanthite2.BA.35Ag2S
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
ⓘMolybdenite2.EA.30MoS2
ⓘPyrite2.EB.05aFeS2
ⓘProustite2.GA.05Ag3AsS3
ⓘ'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
Group 3 - Halides
ⓘIodargyrite3.AA.10AgI
ⓘChlorargyrite3.AA.15AgCl
ⓘvar. Bromian Chlorargyrite3.AA.15Ag(Cl,Br)
ⓘBromargyrite3.AA.15AgBr
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘHematite4.CB.05Fe2O3
ⓘQuartz
var. Chalcedony		4.DA.05SiO2
ⓘvar. Amethyst4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘPlattnerite4.DB.05PbO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘSiderite5.AB.05FeCO3
ⓘRhodochrosite5.AB.05MnCO3
ⓘAurichalcite ?5.BA.15(Zn,Cu)5(CO3)2(OH)6
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘJarosite7.BC.10KFe3+3(SO4)2(OH)6
ⓘAlunite7.BC.10KAl3(SO4)2(OH)6
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘWulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
ⓘConichalcite8.BH.35CaCu(AsO4)(OH)
ⓘMimetite8.BN.05Pb5(AsO4)3Cl
Group 9 - Silicates
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘMuscovite
var. Sericite		9.EC.15KAl2(AlSi3O10)(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘMontmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘSanidine9.FA.30K(AlSi3O8)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Limonite'-
ⓘ'Wad'-
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ''-
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4
ⓘ'Mimetite-Pyromorphite Series'-

List of minerals for each chemical element

HHydrogen
Hⓘ AluniteKAl3(SO4)2(OH)6
Hⓘ Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ ConichalciteCaCu(AsO4)(OH)
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ JarositeKFe33+(SO4)2(OH)6
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cⓘ Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Cⓘ CalciteCaCO3
Cⓘ RhodochrositeMnCO3
Cⓘ SideriteFeCO3
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ AluniteKAl3(SO4)2(OH)6
Oⓘ Quartz var. AmethystSiO2
Oⓘ Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ Quartz var. ChalcedonySiO2
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ ConichalciteCaCu(AsO4)(OH)
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HematiteFe2O3
Oⓘ JarositeKFe33+(SO4)2(OH)6
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MimetitePb5(AsO4)3Cl
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Oⓘ PlattneritePbO2
Oⓘ QuartzSiO2
Oⓘ RhodochrositeMnCO3
Oⓘ SanidineK(AlSi3O8)
Oⓘ SideriteFeCO3
Oⓘ WulfenitePb(MoO4)
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluoriteCaF2
NaSodium
Naⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ AluniteKAl3(SO4)2(OH)6
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Alⓘ SanidineK(AlSi3O8)
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ Quartz var. AmethystSiO2
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Quartz var. ChalcedonySiO2
Siⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Siⓘ QuartzSiO2
Siⓘ SanidineK(AlSi3O8)
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sⓘ AcanthiteAg2S
Sⓘ AluniteKAl3(SO4)2(OH)6
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ GalenaPbS
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ JarositeKFe33+(SO4)2(OH)6
Sⓘ MolybdeniteMoS2
Sⓘ ProustiteAg3AsS3
Sⓘ PyriteFeS2
Sⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ClChlorine
Clⓘ ChlorargyriteAgCl
Clⓘ Chlorargyrite var. Bromian ChlorargyriteAg(Cl,Br)
Clⓘ MimetitePb5(AsO4)3Cl
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ AluniteKAl3(SO4)2(OH)6
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ JarositeKFe33+(SO4)2(OH)6
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ SanidineK(AlSi3O8)
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ ConichalciteCaCu(AsO4)(OH)
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ FluoriteCaF2
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MnManganese
Mnⓘ RhodochrositeMnCO3
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ HematiteFe2O3
Feⓘ JarositeKFe33+(SO4)2(OH)6
Feⓘ PyriteFeS2
Feⓘ SideriteFeCO3
CuCopper
Cuⓘ Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ ConichalciteCaCu(AsO4)(OH)
Cuⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Znⓘ Aurichalcite(Zn,Cu)5(CO3)2(OH)6
AsArsenic
Asⓘ ConichalciteCaCu(AsO4)(OH)
Asⓘ MimetitePb5(AsO4)3Cl
Asⓘ ProustiteAg3AsS3
BrBromine
Brⓘ BromargyriteAgBr
Brⓘ Chlorargyrite var. Bromian ChlorargyriteAg(Cl,Br)
MoMolybdenum
Moⓘ MolybdeniteMoS2
Moⓘ WulfenitePb(MoO4)
AgSilver
Agⓘ AcanthiteAg2S
Agⓘ BromargyriteAgBr
Agⓘ ChlorargyriteAgCl
Agⓘ Chlorargyrite var. Bromian ChlorargyriteAg(Cl,Br)
Agⓘ IodargyriteAgI
Agⓘ ProustiteAg3AsS3
Agⓘ SilverAg
SbAntimony
Sbⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
IIodine
Iⓘ IodargyriteAgI
AuGold
Auⓘ GoldAu
PbLead
Pbⓘ GalenaPbS
Pbⓘ MimetitePb5(AsO4)3Cl
Pbⓘ PlattneritePbO2
Pbⓘ WulfenitePb(MoO4)

Other Databases

Link to USGS MRDS:10103554

Other Regions, Features and Areas containing this locality

Mexico
North America
North America PlateTectonic Plate

This page 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

MRDS database Dep. ID file #10103554, MRDS ID #M030569; and, Dep. ID #10232286, MAS ID #0040030120.
Endlich, F.M. (1897), The Pearce Mining Distict, Engineering and Mining Journal: 63(23): 571.
Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.
Scott, W.A. (1916a) Commonwealth mine and mill at Pearce, Arizona: Mining and Engineering World (Chicago): 45: 187-188.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 26.
Smith, L.A. (1927) The geology of the Commonwealth mine: Tucson, University of Arizona, M.S. thesis, 73 p.
Galbraith, F. W. (1947) Minerals of Arizona (Second Edition, Revised) University of Arizona Bulletin 153. Arizona Bureau of Mines
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 24.
U.S. Atomic Energy Commission Preliminary Reconnaissance Report PRR A-P-46 (1953).
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 42, 43, 64.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 187, Index of Mining Properties in Cochise County, Arizona: 69 (Table 4).
Howell, K.K. (1977) Geology and alteration of the Commonwealth mine, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 225 p.
Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.
Heylmun, Edgar B. (1988) Commonwealth Silver-Gold Mine, Arizona. California Mining Journal: 57(5): 14-16.
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.
Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.
Atlas Corporation news release (1995) 9-7-1995.
Randol Mining Directory (1996/1997) U.S. Mines and Mining Companies: 133.
American Mining Handbook (1996): 242.
American Mining Handbook (1997): 277.
(n.d.) ADMMR Mines Database, Arizona Geological Survey.
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