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Safford Copper Mine (Kennecott Safford; Lone Star Mine), Lone Star Mining District (Safford Mining District; Dos Pobres Mining District), Graham Co., Arizona, USAi
Regional Level Types
Safford Copper Mine (Kennecott Safford; Lone Star Mine)- not defined -
Lone Star Mining District (Safford Mining District; Dos Pobres Mining District)Mining District
Graham Co.County
ArizonaState
USACountry

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Key
Latitude & Longitude (WGS84):
32° 56' 48'' North , 109° 39' 15'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Safford9,683 (2017)13.5km
Thatcher4,992 (2017)14.6km
Solomon426 (2011)15.0km
San Jose506 (2011)15.2km
Central645 (2011)15.7km


An open-pit Cu-Mo+Au-Ag-Pb-Zn occurrence/deposit/mine located in the S½ sec. 27, T5S, R26E, G&SRM, 8 miles (13 km) N of Safford (Safford 15 minute topo map), on private property. Discovered in 1899. Produced during the period 1899 to 1939. The mine is owned and operated by Freeport-McMoran Copper & Gold. The Safford Mine contains: Dos Pobres Mine- MRDS deposit ID 10096999; San Juan Mine - MRDS deposit ID 10027008; Lone Star - MRDS deposit ID 10209543. Associated deposits include: Sanchez Copper deposit - MRDS deposit ID 10026888 and the original Safford deposit - MRDS deposit ID 10027031.

Construction on the Safford Mine began in mid-2006. Production began December 26, 2007, with full production started in 2008. It is the first new large-scale copper mining project in Arizona in more than 30 years. In September of 2005, as part of the deal, Phelps Dodge (which was subsequently purchased by Freeport-McMoran) transferred 3,867 acres (15.65 km2) of "environmentally sensitive" land to the Bureau of Land Management (BLM) and purchased 16,297 acres (65.95 km2), located next to where the mine is located, from the BLM. The mine composes two porphyry copper deposits (the San Juan and Dos Pobres copper ore bodies) that have leachable oxide and secondary sulfide mineralization. Freeport-McMoran estimated that it would remove 205 to 240 million pounds of copper from the deposits annually between 2008 and 2011.


Mineralization is a polymetallic deposit (Mineral occurrence model information: Model code: 53; USGS model code: 17; Deposit model name: porphyry Cu; Mark3 model number: 4) and/or (model code 78; USGS model code 20c; deposit model name: Porphyry Cu-Au; Mark3 model number: 34), hosted in swarms of quartz diorite dikes, rhyolite, dacite and latite, and includes secondary Cu minerals. The ore body is 457.2 meters thick, 2,743.2 meters wide and 6,096 meters long, with a depth-to-bottom of 762 meters and a depth-to-top of 304.8 meters. Controls for ore emplacement include NE-trending shears intruded by dikes. Local alteration includes hydrothermal activity and oxidation in 4 hypogene alteration zones: 1) seritization & silicification in rhyolite, latite, quartz latite, 2) biotization in andesite, 3) chloritization, 4) propylitic alteration. The ore body is in zones 1 & 2. Supergene enrichment has taken place to average depth of 440 feet. Local rocks include Middle Miocene to Oligocene volcanic rocks. Associated rocks include Eocene quartz monzonite of the Lone Star pluton, and diorite.

Local geologic structures include the Lone Star shear zone 6,000 feet wide and 16,000 feet long, Striking N50-65E, with a steep to vertical dip; the NW-striking Butte Fault and the local San Juan Shear Zone.

Workings include surface and underground workings with a length of 914.4 meters and an overall depth of 245.06 meters. A development shaft was sunk in 1961 to a depth of 804 feet, with 1,500 feet of crosscutting, 1,500 feet of drifting plus surface and underground exploratory drilling.

Production statistics: Year: 2007: Cu @ 450 metric tons; year: 2008: 60,300 metric tons; year: 2009: 83,500 metric tons.

Analytical data results: chalcopyrite:pyrite = 2:1 in the primary ore zone. Pyrite is 0.2-1.0% of the ore body by volume.

Reserves and resources: type: in-situ (estimate year = 1974); total resources: 136,054,000 metric tons of ore. Cu at 0.7 weight percent.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


25 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Alunite
Formula: KAl3(SO4)2(OH)6
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Antlerite
Formula: Cu3(SO4)(OH)4
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Bornite
Formula: Cu5FeS4
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Chalcanthite
Formula: CuSO4 · 5H2O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Chalcocite
Formula: Cu2S
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Chalcopyrite
Formula: CuFeS2
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
'Chlorite Group'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Covellite
Formula: CuS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Cuprite
Formula: Cu2O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Galena
Formula: PbS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Goethite
Formula: α-Fe3+O(OH)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Gold
Formula: Au
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Hematite
Formula: Fe2O3
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Molybdenite
Formula: MoS2
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Pyrite
Formula: FeS2
Reference: Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Quartz
Formula: SiO2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Sphalerite
Formula: ZnS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Tenorite
Formula: CuO
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Tetrahedrite
Formula: Cu6Cu4(Fe2+,Zn)2Sb4S13
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.
Turquoise
Formula: Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Tetrahedrite2.GB.05Cu6Cu4(Fe2+,Zn)2Sb4S13
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Tenorite4.AB.10CuO
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Antlerite7.BB.15Cu3(SO4)(OH)4
Brochantite7.BB.25Cu4(SO4)(OH)6
Chalcanthite7.CB.20CuSO4 · 5H2O
Jarosite7.BC.10KFe3+3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Turquoise8.DD.15Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)

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 = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Tetrahedrite3.3.6.1Cu6Cu4(Fe2+,Zn)2Sb4S13
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
AX
Tenorite4.2.3.1CuO
A2X3
Hematite4.3.1.2Fe2O3
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 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Antlerite30.1.12.1Cu3(SO4)(OH)4
Brochantite30.1.3.1Cu4(SO4)(OH)6
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)7(XO4)4Zq·xH2O
Turquoise42.9.3.1Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
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.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H MalachiteCu2(CO3)(OH)2
H AntleriteCu3(SO4)(OH)4
H BrochantiteCu4(SO4)(OH)6
H ChalcanthiteCuSO4 · 5H2O
H TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
H AluniteKAl3(SO4)2(OH)6
H Goethiteα-Fe3+O(OH)
H JarositeKFe3+ 3(SO4)2(OH)6
H Limonite(Fe,O,OH,H2O)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O MalachiteCu2(CO3)(OH)2
O AntleriteCu3(SO4)(OH)4
O BrochantiteCu4(SO4)(OH)6
O ChalcanthiteCuSO4 · 5H2O
O CupriteCu2O
O TenoriteCuO
O TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
O AluniteKAl3(SO4)2(OH)6
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O JarositeKFe3+ 3(SO4)2(OH)6
O Limonite(Fe,O,OH,H2O)
O MagnetiteFe2+Fe23+O4
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Al AluniteKAl3(SO4)2(OH)6
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
PPhosphorus
P TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
SSulfur
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S ChalcociteCu2S
S MolybdeniteMoS2
S PyriteFeS2
S AntleriteCu3(SO4)(OH)4
S BrochantiteCu4(SO4)(OH)6
S ChalcanthiteCuSO4 · 5H2O
S CovelliteCuS
S GalenaPbS
S SphaleriteZnS
S TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S13
S AluniteKAl3(SO4)2(OH)6
S JarositeKFe3+ 3(SO4)2(OH)6
KPotassium
K AluniteKAl3(SO4)2(OH)6
K JarositeKFe3+ 3(SO4)2(OH)6
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
FeIron
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S13
Fe TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CuCopper
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
Cu ChalcociteCu2S
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
Cu AntleriteCu3(SO4)(OH)4
Cu BrochantiteCu4(SO4)(OH)6
Cu ChalcanthiteCuSO4 · 5H2O
Cu CovelliteCuS
Cu CupriteCu2O
Cu TenoriteCuO
Cu TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S13
Cu TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
ZnZinc
Zn SphaleriteZnS
Zn TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S13
MoMolybdenum
Mo MolybdeniteMoS2
SbAntimony
Sb TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S13
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cook And Robinson (1962), New Mexico Geological Society, 13th Field Conference` Guidebook.
Robinson, R.F., and Cook, A. (1966), The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press.
Alstine, R.E. & R. Moore, Fluorspar, USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 230-238.
Laine (1974), M.S. Thesis, University of Arizona.
World Mining (1974): 29(4): 139. (reserve-resource data)
Bolin (1976), M.S. Thesis, University of Arizona.
Dewhurst (1976), M.S. Thesis, University of Arizona.
Dunn, P.G. (1978) Geologic structure of the Safford district, Arizona, in Jenney, J.P., and Hauck, H.R., eds., Proceedings of the Porphyry Copper Symposium, Tucson, Arizona, March 18-20, 1976: Arizona Geological Society Digest: 11: 9-15.
Horsnail, R.F. (1978) Safford district, Graham County, Arizona, in Lovering, R.G., and McCarthy, J.H., Jr., eds., Conceptual models in exploration geochemistry; the Basin and Range Province of the western United States and northern Mexico: Journal of Geochemical Exploration: 9(2-3): 151-153, 241-243.
Yarter, W.V. (1981) Geology, geochemistry, alteration, and mass transfer in the Sol prospect, a sub-economic porphyry copper-molybdenum deposit, Safford district, Graham County, Arizona: Tucson, University of Arizona, M.S. thesis, 136 p.
Langton, J. M., Williams, S. A. (1982) Structural, petrological and mineralogical controls for the Dos Pobres orebody, Lone Star Mining District, Graham County, Arizona: in Titley S R 1983 Advances in Geology of the Porphyry Copper Deposits, Southwestern North America University of Arizona Press, Tucson: 335-352.
Lowell, J.D. (1989), Gold mineralization in porphyry copper deposits discussed: Mining Engineering: 41(4): 227-231.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 8 (Table 1).
Williams, S.A., and Forrester, J.D. (1995), Characteristics of porphyry copper deposits, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20: 21-34.
Mining Engineering Annual Review (1996), Exploration overview, copper: May: 50.
Valentine (19??), M.S. Thesis, University of Utah.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027031 & 10400314.
The Porter GeoConsultancy webpage for Dos Pobres, Safford contains a description of the geology as of 8/4/2010. (http://www.portergeo.com.au)
Admr. Sr No 2, P. 83-87.
USGS, Short papers in the geologic and hydrologic sciences, articles 147-292: Chapter C in Geological Survey research 1961, Professional Paper 424-C: 151-153.

USGS MRDS Record:10027031

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