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Lakeshore Mine, North Komelik area, Casa Grande Mining District, Pinal County, Arizona, USAi
Regional Level Types
Lakeshore MineMine
North Komelik areaArea
Casa Grande Mining DistrictMining District
Pinal CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
32° 31' 23'' North , 111° 54' 6'' West
Latitude & Longitude (decimal):
32.52306,-111.90194
GRN:
N22W68
Type:
Mine
Köppen climate type:
BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
Anegam151(2011)20.6km
Vaiva Vo128(2011)21.8km
Santa Rosa628(2011)25.7km
Chuichu269(2011)27.8km
Arizona City10,475(2011)33.7km
Mindat Locality ID:
51058
Long-form identifier:
mindat:1:2:51058:2
GUID (UUID V4):
0
Other/historical names associated with this locality:
Casa Grande Mine; Trans Arizona Res. Inc. Mine; Treasure State Mine; Cyprus Casa Grande Mine; Tohono Mine; Cyprus Tohono Mine


A former surface and underground Cu-Mo-Au-Ag-Pb-Zn mine located in the SE¼ sec. 25, and secs. 26, 35 & 36, T10S, R4E (Silver Reef Mts 15 minute topo map), approximately 2 miles SE of North Komelik. Discovered in 1966 by the El Paso Natural Gas Co. Produced 1974-1986. Previous operator was the Hecla Mining Co. and Noranda Lakeshore Mines, Inc. (1983). The ore outcrop in the bottom of a shallow arroyo was discovered in the early 1880's by Trout & Achinson. Based from the Tohono O'odham Indians 6 patented and 19 unpatented lode claims encompasing 402 acres; in addition 10,142 acres were leased from the Tohono O'odham Indians.

Mineralization is a skarn-related porphyry copper deposit with an irregular, pipe-shaped ore body hosted in Mescal Limestone and diabase. The ore body is 914.4 meters thick, plunges 20 degrees, with a depth-to-bottom of 914.4 meters and a length of 1219.2 meters. Ore control was faulting and stratigraphic control. Alteration is oxidation, potassic, phyllic, argillic, sericitization and propyllitic zones.

Area structures include the Lakeshore Fault (NNW strike, dip 50-80W). Post-ore faulting dropped stock down to the west.

Workings are least 900 feet deep.

Assay data: 0.76% Cu in sulfide ore, 1.03% Cu in oxide ore (1976). Ore reserves were placed at 9,977,000 metric tons (1983).

The deposit has 3 principal parts: 1) a core of disseminated sulfide ore in quartz monzonite; 2) a tactite ore in Paleozoic and Precambrian sediments at the base and marginal to the thick sulfide deposit; and 3) an enriched blanket of oxide ore formed by oxidation of a secondary enriched chalcocite blanket overlying the core. A high-value reverse fault offsets the overlying oxide zone to the west from the central sulfide zone on the east. Pyrite: chalcopyrite suggests a pyrite halo. USBM gives orebody dimensions as: 6000 feet long, 1080 feet thick, 2500 feet wide, and 500 feet deep.

Oxide ore was mined by open pit methods in early production, sulfide and tactite ore by room & pillar, block caving. In 1884 the mine had a 112 foot deep shaft & drifting. In 1914 a new vertical shaft was sunk to 285 feet. In 1993 and an in-situ leach operation was started. Further property evaluation was undertaken in 1993.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

ⓘAnhydrite
Formula:CaSO4
ⓘAtacamite
Formula:Cu2(OH)3Cl
Description: An isolated occurrence on the 900 level in the 'brochantite zone.'
ⓘ'Biotite'
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘBornite
Formula:Cu5FeS4
ⓘBrochantite
Formula:Cu4(SO4)(OH)6
Description: Occurs on the 900 level in the 'brochantite zone.'
ⓘCalcite
Formula:CaCO3
ⓘChalcocite
Formula:Cu2S
ⓘChalcopyrite
Formula:CuFeS2
ⓘ'Chlorite Group'
ⓘChondrodite
Formula:Mg5(SiO4)2F2
Description: Locally abundant in forsterite marble.
ⓘChrysocolla
Formula:Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x< 1
ⓘCovellite
Formula:CuS
ⓘCuprite
Formula:Cu2O
ⓘDiopside
Formula:CaMgSi2O6
ⓘDioptase
Formula:CuSiO3 · H2O
ⓘForsterite
Formula:Mg2SiO4
Description: Locally abundant in some portions of metadolomites.
ⓘGalena
Formula:PbS
ⓘ'Garnet Group'
Formula:X3Z2(SiO4)3
ⓘGoethite
Formula:Fe3+O(OH)
ⓘGypsum
Formula:CaSO4 · 2H2O
ⓘHematite
Formula:Fe2O3
ⓘKaolinite
Formula:Al2(Si2O5)(OH)4
ⓘ'K Feldspar'
ⓘ'Limonite'
ⓘMagnetite
Formula:Fe2+Fe3+2O4
ⓘMolybdenite
Formula:MoS2
ⓘMuscovite
Formula:KAl2(AlSi3O10)(OH)2
ⓘMuscovite var. Sericite
Formula:KAl2(AlSi3O10)(OH)2
ⓘNative Copper
Formula:Cu
ⓘPhlogopite
Formula:KMg3(AlSi3O10)(OH)2
Description: Occurs in metadolomites with chondrodite and forsterite.
ⓘPyrite
Formula:FeS2
ⓘRutile
Formula:TiO2
ⓘ'Smectite Group'
Formula:A0.3D2-3[T4O10]Z2 · nH2O
ⓘSphalerite
Formula:ZnS
ⓘTenorite
Formula:CuO
ⓘTremolite
Formula:◻Ca2Mg5(Si8O22)(OH)2
ⓘ'Wad'

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Copper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘBornite2.BA.15Cu5FeS4
ⓘCovellite2.CA.05aCuS
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
ⓘMolybdenite2.EA.30MoS2
ⓘPyrite2.EB.05aFeS2
Group 3 - Halides
ⓘAtacamite3.DA.10aCu2(OH)3Cl
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.Fe3+O(OH)
ⓘCuprite4.AA.10Cu2O
ⓘTenorite4.AB.10CuO
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘRutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAnhydrite7.AD.30CaSO4
ⓘBrochantite7.BB.25Cu4(SO4)(OH)6
ⓘGypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2SiO4
ⓘChondrodite9.AF.45Mg5(SiO4)2F2
ⓘDioptase9.CJ.30CuSiO3 · H2O
ⓘDiopside9.DA.15CaMgSi2O6
ⓘTremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘvar. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Limonite'-
ⓘ'Wad'-
ⓘ'K Feldspar'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O

List of minerals for each chemical element

HHydrogen
HⓘAtacamiteCu2(OH)3Cl
HⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
HⓘBrochantiteCu4(SO4)(OH)6
HⓘChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x< 1
HⓘDioptaseCuSiO3 · H2O
HⓘGoethiteFe3+O(OH)
HⓘGypsumCaSO4 · 2H2O
HⓘKaoliniteAl2(Si2O5)(OH)4
HⓘMuscoviteKAl2(AlSi3O10)(OH)2
HⓘPhlogopiteKMg3(AlSi3O10)(OH)2
HⓘTremolite◻Ca2Mg5(Si8O22)(OH)2
HⓘMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
HⓘSmectite GroupA0.3D2-3[T4O10]Z2 · nH2O
CCarbon
CⓘCalciteCaCO3
OOxygen
OⓘAnhydriteCaSO4
OⓘAtacamiteCu2(OH)3Cl
OⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
OⓘBrochantiteCu4(SO4)(OH)6
OⓘCalciteCaCO3
OⓘChondroditeMg5(SiO4)2F2
OⓘChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x< 1
OⓘCupriteCu2O
OⓘDiopsideCaMgSi2O6
OⓘDioptaseCuSiO3 · H2O
OⓘForsteriteMg2SiO4
OⓘGoethiteFe3+O(OH)
OⓘGypsumCaSO4 · 2H2O
OⓘHematiteFe2O3
OⓘKaoliniteAl2(Si2O5)(OH)4
OⓘMagnetiteFe2+Fe23+O4
OⓘMuscoviteKAl2(AlSi3O10)(OH)2
OⓘPhlogopiteKMg3(AlSi3O10)(OH)2
OⓘRutileTiO2
OⓘTenoriteCuO
OⓘTremolite◻Ca2Mg5(Si8O22)(OH)2
OⓘMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
OⓘGarnet GroupX3Z2(SiO4)3
OⓘSmectite GroupA0.3D2-3[T4O10]Z2 · nH2O
FFluorine
FⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FⓘChondroditeMg5(SiO4)2F2
MgMagnesium
MgⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgⓘChondroditeMg5(SiO4)2F2
MgⓘDiopsideCaMgSi2O6
MgⓘForsteriteMg2SiO4
MgⓘPhlogopiteKMg3(AlSi3O10)(OH)2
MgⓘTremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
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ⓘKaoliniteAl2(Si2O5)(OH)4
AlⓘMuscoviteKAl2(AlSi3O10)(OH)2
AlⓘPhlogopiteKMg3(AlSi3O10)(OH)2
AlⓘMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
SiⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
SiⓘChondroditeMg5(SiO4)2F2
SiⓘChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x< 1
SiⓘDiopsideCaMgSi2O6
SiⓘDioptaseCuSiO3 · H2O
SiⓘForsteriteMg2SiO4
SiⓘKaoliniteAl2(Si2O5)(OH)4
SiⓘMuscoviteKAl2(AlSi3O10)(OH)2
SiⓘPhlogopiteKMg3(AlSi3O10)(OH)2
SiⓘTremolite◻Ca2Mg5(Si8O22)(OH)2
SiⓘMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
SiⓘGarnet GroupX3Z2(SiO4)3
SSulfur
SⓘAnhydriteCaSO4
SⓘBorniteCu5FeS4
SⓘBrochantiteCu4(SO4)(OH)6
SⓘChalcopyriteCuFeS2
SⓘChalcociteCu2S
SⓘCovelliteCuS
SⓘGalenaPbS
SⓘGypsumCaSO4 · 2H2O
SⓘMolybdeniteMoS2
SⓘPyriteFeS2
SⓘSphaleriteZnS
ClChlorine
ClⓘAtacamiteCu2(OH)3Cl
KPotassium
KⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
KⓘMuscoviteKAl2(AlSi3O10)(OH)2
KⓘPhlogopiteKMg3(AlSi3O10)(OH)2
KⓘMuscovite var.SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
CaⓘAnhydriteCaSO4
CaⓘCalciteCaCO3
CaⓘDiopsideCaMgSi2O6
CaⓘGypsumCaSO4 · 2H2O
CaⓘTremolite◻Ca2Mg5(Si8O22)(OH)2
TiTitanium
TiⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
TiⓘRutileTiO2
FeIron
FeⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeⓘBorniteCu5FeS4
FeⓘChalcopyriteCuFeS2
FeⓘGoethiteFe3+O(OH)
FeⓘHematiteFe2O3
FeⓘMagnetiteFe2+Fe23+O4
FeⓘPyriteFeS2
CuCopper
CuⓘAtacamiteCu2(OH)3Cl
CuⓘBorniteCu5FeS4
CuⓘBrochantiteCu4(SO4)(OH)6
CuⓘChalcopyriteCuFeS2
CuⓘChalcociteCu2S
CuⓘChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x< 1
CuⓘCovelliteCuS
CuⓘCupriteCu2O
CuⓘNative CopperCu
CuⓘDioptaseCuSiO3 · H2O
CuⓘTenoriteCuO
ZnZinc
ZnⓘSphaleriteZnS
MoMolybdenum
MoⓘMolybdeniteMoS2
PbLead
PbⓘGalenaPbS

Other Databases

Link to USGS MRDS:10106636

Other Regions, Features and Areas containing this locality

Mexico
North AmericaContinent
North America PlateTectonic Plate
North America Plate
USA

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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Hecla Mining Co. Annual Reports 1970-1976.
MRDS database Dep. ID #10106636, MRDS ID #D000752; and Dep. ID #10162257, MAS ID #0040210004.
Romslo, T.M. (1950) U.S. Bureau of Mines Information Circular 4706.
Engineering and Mining Journal (1969) (6/69).
Harper and Reynolds (1969) Mining Congress Journal: 55(11): 26-30.
Pay Dirt (1969) (9/29/69) & (4/28/69).
Pay Dirt (1970) (3/70).
Skillings (1970) (8/22/70)
Skillings (1971) (2/13/71).
Johnston (1972) Isochron/West, No. 4: 29-30.
South (1972) M.S. thesis, University of Arizona.
Engineering and Mining Journal (1973) (8/73)
Cummins, Arthur B., Given, Ivan A. -Eds. (1973)SME Mining Engineering Handbook (1st ed.) Vol. 1. Society of Mining Engineers.
Skilling (1974) (6/15/74)
Mining Magazine (1975) (5/75): 335.
Pay Dirt (1975) (8/25/75)
Skillings (1976) (11/20/76): 12.
Mining Magazine (1977) (6/77).
Greeley (1978) Arizona Department of Mineral Resources Special Report #2.
Pay Dirt (1978) (3/78).
Cook, Sterling S. (1988) Supergene copper mineralization at the Lakeshore Mine, Pinal County, Arizona.Economic Geology, 83 (2) 297-309doi:10.2113/gsecongeo.83.2.297
Phillips, K.A., Beard, R.R., Niemuth, N.J., and Bain, D.R. (1991) Active Mines in Arizona – 1993: Arizona Department of Mines and Mineral Resources Directory 39, 20 pp.
Niemuth, Nyal J., Phillips, Ken A. (1992, July) Copper Oxide Resources.Open-file Report 92-10. Arizona Department of Mines and Mineral Resourcesp.14 - 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.
Ilton, Eugene S.; Veblen, David R. (1993) Origin and mode of copper enrichment in biotite from rocks associated with porphyry copper deposits: a transmission electron microscopy investigation.Economic Geology, 88 (4). 885-900doi:10.2113/gsecongeo.88.4.885
Arizona Department of Mines & Mineral Resources (1994) Directory of Active Mines in Arizona, Incorporating Sand and Gravel Operations - 1994: Arizona Department of Mines and Mineral Resources Directory 42, 24pp.
Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995)Mineralogy of Arizona (3rd ed.). University of Arizona Press.
Cyprus AMAX Minerals Co. Form 10-K (1995)(12/31/95): 2.
Randolph Mining Directory (1996-1997) U.S. Mines and Mining Companies: 144.
Singer, Donald A., Berger, Vladimir Iosifovich, Moring, Barry C. (2005) Porphyry copper deposits of the world: database, map, and grade and tonnage models.Open-File Report 2005-1060. US Geological Surveydoi:10.3133/ofr20051060
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