Commonwealth Mine, Pearce, Pearce Mining District, Pearce Hills, Sulphur Springs Valley, Cochise County, Arizona, USAi
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Latitude & Longitude (WGS84):
31° 54' 3'' North , 109° 48' 56'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Clubs:
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| Club | Location | Distance |
|---|---|---|
| Sunsites Gem and Mineral Club | Pearce, Arizona | 1km |
Other/historical names associated with this locality:
Pearce Mine; Silver Ware Mine; Brockman Mine; Smith Mine; Rinaud Mine; Ritter Mine; Eisenhart vein
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 ElementsMineral 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 DiagramDetailed Mineral List:
| ⓘ Acanthite Formula: Ag2S References: |
| ⓘ 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 References: |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chlorargyrite Formula: AgCl References: Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.pages 100, 147, 169, 182, 212-213, 259, 261 |
| ⓘ Chlorargyrite var. Bromian Chlorargyrite Formula: Ag(Cl,Br) References: Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.pages 100, 147, 169, 212-213, 259, 425 |
| ⓘ 'Chlorite Group' |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Conichalcite Formula: CaCu(AsO4)(OH) References: |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au Description: Occurs as broad splotches & leaf forms. References: |
| ⓘ Gypsum Formula: CaSO4 · 2H2O |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Iodargyrite Formula: AgI References: |
| ⓘ 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 References: |
| ⓘ 'Mimetite-Pyromorphite Series' References: |
| ⓘ 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 References: |
| ⓘ Proustite Formula: Ag3AsS3 References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ Quartz var. Amethyst Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 References: |
| ⓘ Rhodochrosite Formula: MnCO3 |
| ⓘ Sanidine Formula: K(AlSi3O8) |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 References: |
| ⓘ Siderite Formula: FeCO3 |
| ⓘ Silver Formula: Ag References: |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S References: |
| ⓘ 'Wad' |
| ⓘ Wulfenite Formula: Pb(MoO4) Description: Occurs lining cavities with embolite. References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Proustite | 2.GA.05 | Ag3AsS3 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 3 - Halides | |||
| ⓘ | Iodargyrite | 3.AA.10 | AgI |
| ⓘ | Bromargyrite | 3.AA.15 | AgBr |
| ⓘ | Chlorargyrite | 3.AA.15 | AgCl |
| ⓘ | var. Bromian Chlorargyrite | 3.AA.15 | Ag(Cl,Br) |
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz var. Amethyst | 4.DA.05 | SiO2 |
| ⓘ | var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Plattnerite | 4.DB.05 | PbO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| ⓘ | Siderite | 5.AB.05 | FeCO3 |
| ⓘ | Aurichalcite ? | 5.BA.15 | (Zn,Cu)5(CO3)2(OH)6 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Alunite | 7.BC.10 | KAl3(SO4)2(OH)6 |
| ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| ⓘ | Wulfenite | 7.GA.05 | Pb(MoO4) |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Conichalcite | 8.BH.35 | CaCu(AsO4)(OH) |
| ⓘ | Mimetite | 8.BN.05 | Pb5(AsO4)3Cl |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Montmorillonite | 9.EC.40 | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ | Sanidine | 9.FA.30 | K(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'K Feldspar var. Adularia' | - | KAlSi3O8 |
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Wad' | - | |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
| ⓘ | 'Mimetite-Pyromorphite Series' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| H | ⓘ Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| H | ⓘ Conichalcite | CaCu(AsO4)(OH) |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| H | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Rhodochrosite | MnCO3 |
| C | ⓘ Siderite | FeCO3 |
| O | Oxygen | |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| O | ⓘ Quartz var. Amethyst | SiO2 |
| O | ⓘ Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Conichalcite | CaCu(AsO4)(OH) |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| O | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| O | ⓘ Mimetite | Pb5(AsO4)3Cl |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| O | ⓘ Plattnerite | PbO2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Sanidine | K(AlSi3O8) |
| O | ⓘ Siderite | FeCO3 |
| O | ⓘ Wulfenite | Pb(MoO4) |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | ⓘ Mimetite-Pyromorphite Series | |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(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 |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Al | ⓘ Sanidine | K(AlSi3O8) |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ Quartz var. Amethyst | SiO2 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Sanidine | K(AlSi3O8) |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| P | Phosphorus | |
| P | ⓘ Mimetite-Pyromorphite Series | |
| S | Sulfur | |
| S | ⓘ Acanthite | Ag2S |
| S | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Galena | PbS |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Proustite | Ag3AsS3 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Cl | Chlorine | |
| Cl | ⓘ Chlorargyrite | AgCl |
| Cl | ⓘ Chlorargyrite var. Bromian Chlorargyrite | Ag(Cl,Br) |
| Cl | ⓘ Mimetite | Pb5(AsO4)3Cl |
| Cl | ⓘ Mimetite-Pyromorphite Series | |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| K | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Sanidine | K(AlSi3O8) |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Conichalcite | CaCu(AsO4)(OH) |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
| Ca | ⓘ Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mn | Manganese | |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Siderite | FeCO3 |
| Cu | Copper | |
| Cu | ⓘ Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Conichalcite | CaCu(AsO4)(OH) |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Zn | Zinc | |
| Zn | ⓘ Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| As | Arsenic | |
| As | ⓘ Conichalcite | CaCu(AsO4)(OH) |
| As | ⓘ Mimetite | Pb5(AsO4)3Cl |
| As | ⓘ Proustite | Ag3AsS3 |
| As | ⓘ Mimetite-Pyromorphite Series | |
| Br | Bromine | |
| Br | ⓘ Bromargyrite | AgBr |
| Br | ⓘ Chlorargyrite var. Bromian Chlorargyrite | Ag(Cl,Br) |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Mo | ⓘ Wulfenite | Pb(MoO4) |
| Ag | Silver | |
| Ag | ⓘ Acanthite | Ag2S |
| Ag | ⓘ Bromargyrite | AgBr |
| Ag | ⓘ Chlorargyrite | AgCl |
| Ag | ⓘ Chlorargyrite var. Bromian Chlorargyrite | Ag(Cl,Br) |
| Ag | ⓘ Iodargyrite | AgI |
| Ag | ⓘ Proustite | Ag3AsS3 |
| Ag | ⓘ Silver | Ag |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| I | Iodine | |
| I | ⓘ Iodargyrite | AgI |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
| Pb | ⓘ Mimetite | Pb5(AsO4)3Cl |
| Pb | ⓘ Plattnerite | PbO2 |
| Pb | ⓘ Wulfenite | Pb(MoO4) |
| Pb | ⓘ Mimetite-Pyromorphite Series | |
Other Databases
| Link to USGS MRDS: | 10103554 |
|---|
Other Regions, Features and Areas containing this locality
Mexico
- Sierra Madre OccidentalMountain Range
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
- Pedregosa BasinBasin
- Southern Basin and RangeWide Rift
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Commonwealth Mine, Pearce, Pearce Mining District, Pearce Hills, Sulphur Springs Valley, Cochise County, Arizona, USA