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Kofa Mining District, Yuma County, Arizona, USAi
Regional Level Types
Kofa Mining DistrictMining District
Yuma CountyCounty
ArizonaState
USACountry

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PhotosMapsSearch
01915220015682046208382.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
06705700015682046202930.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
01559130016072974288452.jpg
Quartz, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
08602700015681514916350.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
08655750016027106574941.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
00613520015870845216469.jpg
Quartz, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
01915220015682046208382.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
02660710015884016813463.jpg
Opal-AN, etc.

King of Arizona Mine, Kofa Mining District, Yuma County, Arizona, USA
Latitude & Longitude (WGS84):
32° North , 113° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~98km
GRN:
N22W69
Type:
Mining District
Köppen climate type:
BWh : Hot deserts climate
Mindat Locality ID:
33516
Long-form identifier:
mindat:1:2:33516:7
GUID (UUID V4):
8282773d-9ca8-465e-be6b-f6b905c2a76b


A Au-Ag-Mn-W-Cu-Pb-F mining district located in T1-2S, R15-17W, G&SRM, in the southern/SW margin of the Kofa (S.H.) Mountains.

Mineralization within the district varies: (1) Spotty, but often high-grade, fine-grained, gold and silver mineralization in lensing quartz-calcite, brecciated rock, fissure veins cutting Cretaceous or Tertiary andesite and Mesozoic schist or slate. Minor copper and lead, and often considerable manganese and local fluorite. Wall rocks are strongly silicified; (2) Erratic and irregular manganese oxides in fracture zones in fragmented Cretaceous or Tertiary andesitic volcanics; and, (3) Spotty stringers, pods, and disseminated grains of scheelite, associated with quartz and iron oxides, in fracture zones in fragmented volcanics and schist.

Workings include 2 major mines and numerous prospects and small mines operated mainly in the late 1800's and early 1900's, with small, intermittent operations until 1954. Total estimated and recorded production of precious and base metals through 1974 would be some 779,500 tons of ore containing about 227,500 ounces Au, 103,700 ounces Ag, 3 tons of lead and one ton of copper. Over 1,000 ounces of placer gold were recovered. Manganese production was about 230 long tons of 27% Mn and about 94 short ton units of WO3. Total production s set at some $5,000,000 (period values).

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

25 valid minerals.

Rock Types Recorded

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

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
ⓘ Calcite var. Manganese-bearing Calcite
Formula: (Ca,Mn)CO3
Colour: Black to brown
Description: Highly manganoan.
ⓘ Chalcophanite
Formula: ZnMn4+3O7 · 3H2O
ⓘ 'Chlorite Group'
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Fluorite
Formula: CaF2
Localities: Reported from at least 7 localities in this region.
ⓘ Galena
Formula: PbS
Description: Disseminated in gangue of fluorite & calcite.
ⓘ Gold
Formula: Au
Localities: Reported from at least 9 localities in this region.
Description: As fine-grained free gold. with silver.
ⓘ Groutite
Formula: Mn3+O(OH)
ⓘ 'K Feldspar'
Description: Microscopic mixture with quartz.
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
Description: Microscopic mixture with quartz.
ⓘ Manganite
Formula: Mn3+O(OH)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ 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
Description: Finely disseminated in calcareous shale footwall rock.
ⓘ Pyrolusite
Formula: Mn4+O2
ⓘ Quartz
Formula: SiO2
Description: Crystals in small veinlets.
ⓘ Quartz var. Chalcedony
Formula: SiO2
Description: Banded; a breccia cement.
ⓘ Rhodochrosite
Formula: MnCO3
ⓘ Rhodonite
Formula: CaMn3Mn[Si5O15]
Description: Occurs in veins in the Eichelberger exotic breccia.
ⓘ Scheelite
Formula: Ca(WO4)
Description: Sparse.
ⓘ Silver
Formula: Ag
Description: With gold.
ⓘ Todorokite
Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
ⓘ Willemite
Formula: Zn2SiO4

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘSilver1.AA.05Ag
ⓘGold1.AA.05Au
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
ⓘBixbyite-(Mn)4.CB.10Mn3+2O3
ⓘQuartz4.DA.05SiO2
ⓘvar. Chalcedony4.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)
ⓘChalcophanite4.FL.20ZnMn4+3O7 · 3H2O
ⓘAurorite4.FL.20Mn2+Mn4+3O7 · 3H2O
Group 5 - Nitrates and Carbonates
ⓘRhodochrosite5.AB.05MnCO3
ⓘCalcite
var. Manganese-bearing Calcite		5.AB.05(Ca,Mn)CO3
ⓘ5.AB.05CaCO3
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
Unclassified
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ'Psilomelane'-
ⓘ'Chlorite Group'-
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'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ⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ GroutiteMn3+O(OH)
Hⓘ Opal var. Opal-ANSiO2 · nH2O
Hⓘ ManganiteMn3+O(OH)
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
CCarbon
Cⓘ CalciteCaCO3
Cⓘ Calcite var. Manganese-bearing Calcite(Ca,Mn)CO3
Cⓘ RhodochrositeMnCO3
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
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ⓘ 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ⓘ 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ⓘ 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ⓘ 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ⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Quartz var. ChalcedonySiO2
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ⓘ 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
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ⓘ PyriteFeS2
CuCopper
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ⓘ 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ⓘ GoldAu
PbLead
Pbⓘ BoulangeritePb5Sb4S11
Pbⓘ GalenaPbS

Localities in this Region

USA
USA

Other Regions, Features and Areas containing this locality

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

Blake, W.P. (1898) Distribution of metallic wealth in Arizona, in Report of the Governor of Arizona to the Secretary of the Interior for fiscal year ending June 30, 1898: Washington, D.C.: 19-86.
Jones, Jr., E.L. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 164.
Thompson (1925), Arizona Mining Journal, Nov 1925: 9(12): 7.
(1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. University of Arizona Bulletin 134. Arizona Bureau of Minesp.134
A.I.M.E. Ore deposits of the western states (1933): 629.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 136-143.
Hewett, D. F. (1964) Veins of hypogene manganese oxide minerals in the southwestern United States. Economic Geology, 59 (8) 1429-1472 doi:10.2113/gsecongeo.59.8.1429
Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 154 (Table 4).
Hankins, D.D. (1984), Geologic setting of precious metals mineralization, King of Arizona district, Kofa Mountains, Yuma County, Arizona, San Diego State University M.S. thesis.
Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ.
(n.d.) ADMMR Mines Database, Arizona Geological Survey.
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