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Kofa Mountains, Arizona, USAi
Regional Level Types
Kofa MountainsMountain Range
ArizonaState
USACountry

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PhotosSearchMineralogy
01256490017272724489270.jpg
Quartz

Kofa Mountains, Arizona, USA
05611270017272724492741.jpg
Quartz

Kofa Mountains, Arizona, USA
07673530017272033244898.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
00812110017272022284634.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
04573820017812437632851.jpg
Quartz

Kofa Mountains, Arizona, USA
00884980017812437642526.jpg
Quartz

Kofa Mountains, Arizona, USA
09382820017272033202069.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
00812110017272022284634.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
06484850017272724533444.jpg
Quartz

Kofa Mountains, Arizona, USA
04064500017272724551946.jpg
Quartz

Kofa Mountains, Arizona, USA
Latitude & Longitude (WGS84):
33° North , 113° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~57km
GRN:
N23W68
Type:
Mountain Range
Köppen climate type:
BWh : Hot deserts climate
Mindat Locality ID:
33607
Long-form identifier:
mindat:1:2:33607:8
GUID (UUID V4):
0
Other/historical names associated with this locality:
S.H. Mountains; Stone House Mountains


A mountain range located 20 miles SE of Quartzsite and NE of the Castle Dome Moutnains. The alternate name of S.H. Mountains which allegedly stands for 'Stone House.'

This is an isolated mountainous area in the central part of Yuma County. They cover an area of approximately 200 square miles are are surrounded by broad, gently-aggraded plains that separate them from other detached mountains. The higher summits rise probably 2,000 feet above the surrounding plains.

These mountains are composed of extrusive igneous rocks which rest on an eroded surface of much older rocks. These older rocks are exposed in low foothills in the northern and southern parts of the mountainous area. The volcanic rocks are probably of tertiary and Quaternary age. The older rocks consist of metamorphosed sediments with associated pegmatites, thought to be of Precambrian age, intruded by granite and dike rocks of probable Mesozoic age. These rocks are intricated dissected into flat-topped mesas of small extent or into jagged spires and other fantastic erosional forms.

Mineralization is Au-Cu-Pb deposits that occur in certain fault zones. The bulk of these mountains consists of a gently Northward dipping block of Tertiary rhyolites, andesites and tuffs, capped by basalts, that rises to more than 4,000 feet above sea level, or 2,500 feet above the adjacent plains. Minor areas of schist, granite, and shales are exposed at the base of the volcanics. The granite is of interest since it contains copper deposits. Extensive faulting and fracturing have affected all of the rocks, particularly those of the pre-lava age.
The Kofa Mountains lie principally in Yuma County. Their northern end lies in La Paz County.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

28 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aurorite
Formula: Mn2+Mn4+3O7 · 3H2O
ⓘ Baryte
Formula: BaSO4
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Bixbyite-(Mn)
Formula: Mn3+2O3
ⓘ Boulangerite
Formula: Pb5Sb4S11
Description: Occurs in veinlets.
ⓘ Calcite
Formula: CaCO3
Localities: Reported from at least 16 localities in this region.
ⓘ Calcite var. Manganese-bearing Calcite
Formula: (Ca,Mn)CO3
Colour: Black to brown
Description: Highly manganoan.
ⓘ Chalcophanite
Formula: ZnMn4+3O7 · 3H2O
ⓘ 'Chlorite Group'
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Fluorite
Formula: CaF2
Localities: Reported from at least 7 localities in this region.
ⓘ Galena
Formula: PbS
ⓘ Groutite
Formula: Mn3+O(OH)
ⓘ 'K Feldspar'
Description: Microscopic in secondary quartz.
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
Description: Microscopic in secondary quartz.
ⓘ 'Limonite'
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
Description: Disseminated.
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
ⓘ Manganite
Formula: Mn3+O(OH)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as an alteration product in wall rocks.
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as an alteration product in wall rocks.
ⓘ Native Gold
Formula: Au
Localities: Reported from at least 21 localities in this region.
Description: As fine-grained free gold. with silver.
ⓘ Native Silver
Formula: Ag
Description: With gold.
ⓘ Nsutite
Formula: (Mn4+,Mn2+)(O,OH)2
ⓘ Opal
Formula: SiO2 · nH2O
Habit: botryoidal
Colour: colorless
Fluorescence: green
Description: Botryoidal formations partly covered by white calcite and quartz.
ⓘ Opal var. Opal-AN
Formula: SiO2 · nH2O
Habit: botryoidal
Colour: colorless
Fluorescence: green
Description: Botryoidal formations partly covered by white calcite and quartz.
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Polybasite
Formula: [Ag6Sb2S7][Ag9CuS4]
ⓘ 'Psilomelane'
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrolusite
Formula: Mn4+O2
ⓘ Quartz
Formula: SiO2
Localities: Reported from at least 9 localities in this region.
Description: Crystals in small veinlets.
ⓘ Quartz var. Agate
Formula: SiO2
ⓘ Quartz var. Chalcedony
Formula: SiO2
Description: Small nodules in the lode.
ⓘ Quartz var. Fire Agate
Formula: SiO2
ⓘ Quartz var. Sardonyx
Formula: SiO2
ⓘ Rhodochrosite
Formula: MnCO3
ⓘ Rhodonite
Formula: CaMn3Mn[Si5O15]
Description: Occurs in veins in the Eichelberger exotic breccia.
ⓘ Scheelite
Formula: Ca(WO4)
Description: Sparse.
ⓘ Todorokite
Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
ⓘ 'Wad'
ⓘ Willemite
Formula: Zn2SiO4

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Gold1.AA.05Au
ⓘNative Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
ⓘPolybasite2.GB.15[Ag6Sb2S7][Ag9CuS4]
ⓘBoulangerite2.HC.15Pb5Sb4S11
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘBixbyite-(Mn)4.CB.10Mn3+2O3
ⓘQuartz
var. Agate		4.DA.05SiO2
ⓘvar. Chalcedony4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘvar. Fire Agate4.DA.05SiO2
ⓘvar. Sardonyx4.DA.05SiO2
ⓘOpal
var. Opal-AN		4.DA.10SiO2 · nH2O
ⓘ4.DA.10SiO2 · nH2O
ⓘPyrolusite4.DB.05Mn4+O2
ⓘNsutite4.DB.15c(Mn4+,Mn2+)(O,OH)2
ⓘTodorokite4.DK.10(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
ⓘGroutite4.FD.10Mn3+O(OH)
ⓘManganite4.FD.15Mn3+O(OH)
ⓘAurorite4.FL.20Mn2+Mn4+3O7 · 3H2O
ⓘChalcophanite4.FL.20ZnMn4+3O7 · 3H2O
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘvar. Manganese-bearing Calcite5.AB.05(Ca,Mn)CO3
ⓘRhodochrosite5.AB.05MnCO3
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
ⓘScheelite7.GA.05Ca(WO4)
Group 9 - Silicates
ⓘWillemite9.AA.05Zn2SiO4
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘRhodonite9.DK.05CaMn3Mn[Si5O15]
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘvar. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
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'-
ⓘ'Psilomelane'-
ⓘ'Wad'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'K Feldspar'-

List of minerals for each chemical element

HHydrogen
Hⓘ AuroriteMn2+Mn34+O7 · 3H2O
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ ChalcophaniteZnMn34+O7 · 3H2O
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ GroutiteMn3+O(OH)
Hⓘ Opal var. Opal-ANSiO2 · nH2O
Hⓘ ManganiteMn3+O(OH)
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Nsutite(Mn4+,Mn2+)(O,OH)2
Hⓘ OpalSiO2 · nH2O
Hⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CCarbon
Cⓘ CalciteCaCO3
Cⓘ Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Cⓘ MalachiteCu2(CO3)(OH)2
Cⓘ RhodochrositeMnCO3
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ Quartz var. AgateSiO2
Oⓘ AuroriteMn2+Mn34+O7 · 3H2O
Oⓘ BaryteBaSO4
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ Bixbyite-(Mn)Mn23+O3
Oⓘ CalciteCaCO3
Oⓘ ChalcophaniteZnMn34+O7 · 3H2O
Oⓘ Quartz var. ChalcedonySiO2
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GroutiteMn3+O(OH)
Oⓘ Opal var. Opal-ANSiO2 · nH2O
Oⓘ ManganiteMn3+O(OH)
Oⓘ Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ Nsutite(Mn4+,Mn2+)(O,OH)2
Oⓘ OpalSiO2 · nH2O
Oⓘ PyrolusiteMn4+O2
Oⓘ QuartzSiO2
Oⓘ RhodochrositeMnCO3
Oⓘ RhodoniteCaMn3Mn[Si5O15]
Oⓘ ScheeliteCa(WO4)
Oⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Oⓘ WillemiteZn2SiO4
Oⓘ Quartz var. Fire AgateSiO2
Oⓘ Quartz var. SardonyxSiO2
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluoriteCaF2
NaSodium
Naⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
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ⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ Quartz var. AgateSiO2
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ⓘ Opal var. Opal-ANSiO2 · nH2O
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ OpalSiO2 · nH2O
Siⓘ QuartzSiO2
Siⓘ RhodoniteCaMn3Mn[Si5O15]
Siⓘ WillemiteZn2SiO4
Siⓘ Quartz var. Fire AgateSiO2
Siⓘ Quartz var. SardonyxSiO2
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SSulfur
Sⓘ BaryteBaSO4
Sⓘ BoulangeritePb5Sb4S11
Sⓘ GalenaPbS
Sⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Sⓘ PyriteFeS2
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ FluoriteCaF2
Caⓘ Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Caⓘ RhodoniteCaMn3Mn[Si5O15]
Caⓘ ScheeliteCa(WO4)
Caⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MnManganese
Mnⓘ AuroriteMn2+Mn34+O7 · 3H2O
Mnⓘ Bixbyite-(Mn)Mn23+O3
Mnⓘ ChalcophaniteZnMn34+O7 · 3H2O
Mnⓘ GroutiteMn3+O(OH)
Mnⓘ ManganiteMn3+O(OH)
Mnⓘ Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Mnⓘ Nsutite(Mn4+,Mn2+)(O,OH)2
Mnⓘ PyrolusiteMn4+O2
Mnⓘ RhodochrositeMnCO3
Mnⓘ RhodoniteCaMn3Mn[Si5O15]
Mnⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ MalachiteCu2(CO3)(OH)2
Cuⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
ZnZinc
Znⓘ ChalcophaniteZnMn34+O7 · 3H2O
Znⓘ WillemiteZn2SiO4
SrStrontium
Srⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AgSilver
Agⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
Agⓘ Native SilverAg
SbAntimony
Sbⓘ BoulangeritePb5Sb4S11
Sbⓘ Polybasite[Ag6Sb2S7][Ag9CuS4]
BaBarium
Baⓘ BaryteBaSO4
Baⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
WTungsten
Wⓘ ScheeliteCa(WO4)
AuGold
Auⓘ Native GoldAu
PbLead
Pbⓘ BoulangeritePb5Sb4S11
Pbⓘ GalenaPbS

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Kofa_Mountains

Localities in this Region

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Other Regions, Features and Areas that Intersect

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References

Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 151-164.
Wilson, Eldred D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. University of Arizona Bulletin 134. Arizona Bureau of Minespp.106-109
Walker, L.W. (1957), The geodes of Kofa, Nature: 50: 266-267
Dale, V.B. (1959) Tungsten deposits of Yuma, Maricopa, Pinal, and Graham Counties, Arizona. Report of Investigations 5516. United States Bureau of Mines p.3-11.
Dahm, J.B., and Hankins, D.D. (1982) Preliminary geology of a portion of the southern Kofa Mountains, Yuma County, Arizona, in Frost, E.G., and Martin, D.L., eds., Mesozoic-Cenozoic tectonic evolution of the Colorado River region, California, Arizona, and Nevada - Anderson-Hamilton Volume: San Diego, Cordilleran Publishers, p. 459-469.
Hankins, D.D. (1984) Geologic map of a portion of the southern Kofa Mountains, Arizona: Arizona Bureau of Geology and Mineral Technology Miscellaneous Map MM-84-A, 1 sheet, scale 1:12,000.
Hankins, D.D. (1984) Geologic setting of precious metals mineralization, King of Arizona district, Kofa Mountains, Yuma County, Arizona: San Diego, San Diego State University, M.S. thesis, 135 p., 1 sheet, scale 1:12,000.
Charlton, D.W., Copeland, D.J., Reaugh, L.W., and Westall, N.D. (1985) Gold mineralization in low angle faults, Verdstone property, Kofa Mountains, Arizona [abs.]: Geological Society of America Abstracts with Programs: 17(6): 348.
Blair, Gerry (1992) The Rockhound's Guide to Arizona. Falcon Press, Helena, Montana, USA.p.157
Anthony, John W.; Williams, Sidney A.; Bideaux, Richard A.; Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.
Ferguson, C.A., and Skotnicki, S.J. (1996) Geology of the northern Kofa Mountains (Owl Head and northern third of the Kofa Butte 7.5' quadrangles), Yuma and La Paz Counties, Arizona: Arizona Geological Survey Open-File Report 96-03, 22 p., 2 sheets, scale 1:24,000.
Skotnicki, S.J., and Ferguson, C.A. (1996) Geology of the Cholla Tank and northern third of the Hoodoo Well quadrangles), northern Kofa Mountains, Yuma and La Paz Counties, Arizona: Arizona Geological Survey Open-File Report 96-24, 11 p., 1 sheets, scale 1:24,000.
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