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Hornitos Mining District, West Belt, Mariposa County, California, USAi
Regional Level Types
Hornitos Mining DistrictMining District
West Belt- not defined -
Mariposa CountyCounty
CaliforniaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
37° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~26km
GRN:
N26W68
Type:
Mining District
Köppen climate type:
Csa : Hot-summer Mediterranean climate
Mindat Locality ID:
249228
Long-form identifier:
mindat:1:2:249228:8
GUID (UUID V4):
f9450504-ba16-4b62-bf3a-67d481ee81d6


Location: The Hornitos district is in the Sierra Nevada west gold belt in western Mariposa County about 15 miles west of the town of Mariposa (see fig. 4, Bulletin 193). The district contains a several-mile wide belt of lode-gold mines that extends from the vicinity of the Exchequer Reservoir SSE through Hornitos to the Indian Gulch area.

History: The streams in the area were first worked in 1849, and lode mining began in 1850 at the Washington Mine. The town was first settled by Mexicans who had been driven out of nearby Quartzburg. The name Hornitos is a diminutive of "homo" or small bake oven, from the Spanish. Mining activity was great from the 1860's through the 1880's, lesser from the 1890's to the 1920's. The Mt. Gaines Mine was worked on a major scale during the 1930s. Since World War II the area has been prospected, but there has been very little recorded production. Historically, this is the most productive district of the Sierra Nevada West gold belt.

Geology: The district is underlain by greenstone and green schist in the West portion and slate in the East. Also present are smaller amounts of amphibolite, mica schist, and hornfels. A number of small granodiorite intrusions are exposed, along the margins of which chiastolite-mica schist has developed.

Ore Deposits: A number of north-trending quartz veins and stringers containing free gold and varying amounts of sulfides, chiefly pyrite, are present, as well as several large bodies of mineralized greenstone or "gray ore." Some of the veins have very flat dips. The ore shoots vary considerably in size with stoping lengths ranging from a few to as much as 400 feet. Some of the veins have been mined to inclined depths of more than 1500 feet. Milling-grade ore commonly contains from 1/3, to more than ½ ounce per ton in gold.

Mines: Badger ($80,000+), Doss ($100,000), Duncan, Lost Douglas, Martinez, Mt. Gaines ($3.59 million). Number 1 Mine, Number 5 Mine, Number 8 Mine, Number 9 Mine, Ruth Pierce ($600,000), and the Washington Mine ($2,377,000).

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

33 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:

ⓘ Acanthite
Formula: Ag2S
ⓘ Alunite
Formula: KAl3(SO4)2(OH)6
Description: Occurs as a constituent of quartzite.
ⓘ Andalusite
Formula: Al2(SiO4)O
ⓘ Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
ⓘ Arsenopyrite
Formula: FeAsS
ⓘ Baryte
Formula: BaSO4
ⓘ Bornite
Formula: Cu5FeS4
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcocite
Formula: Cu2S
ⓘ Chalcopyrite
Formula: CuFeS2
Localities: Reported from at least 7 localities in this region.
ⓘ 'Chlorite Group'
ⓘ Cooperite
Formula: PtS
ⓘ Covellite
Formula: CuS
ⓘ Galena
Formula: PbS
Localities:
Blue Moon Mine (Porcupine Mine; Blue Cloud Mine; Red Cloud Mine; Percupine Mine; American Eagle Mine; Bullion Hill Mine), Quartzburg, Hornitos Mining District, West Belt, Mariposa County, California, USA
Doss Mine (Brooks; Ginaca; Doss and Thorne), Quartz Mountain [2], Hornitos Mining District, West Belt, Mariposa County, California, USA
Mount Gaines Mine (Frenchman Mine; Bearfield Mine; Barfield Mine; Mount Gaines Gold Mine), Quartzburg, Hornitos Mining District, West Belt, Mariposa County, California, USA
Silver Lead Mine (St. Gabriel and Honeycomb Mine; Silver Lead & Margaretta Mine; Silver Lead claim; Margaretta claim; St. Gabriel claim; Honeycomb claim), Quartzburg, Hornitos Mining District, West Belt, Mariposa County, California, USA
Washington Mine (Red Cloud Mine; Johnny Lind Mine; Jenny Lind Mine), Hornitos, Hornitos Mining District, West Belt, Mariposa County, California, USA
ⓘ Gold
Formula: Au
Localities: Reported from at least 31 localities in this region.
ⓘ Hematite
Formula: Fe2O3
ⓘ Iridium
Formula: (Ir,Os,Ru)
ⓘ Isoferroplatinum
Formula: Pt3Fe
ⓘ 'Limonite'
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Osmium
Formula: (Os,Ir,Ru)
ⓘ Platinum
Formula: Pt
ⓘ Proustite
Formula: Ag3AsS3
ⓘ 'Psilomelane'
ⓘ Pyrargyrite
Formula: Ag3SbS3
ⓘ Pyrite
Formula: FeS2
Localities: Reported from at least 13 localities in this region.
ⓘ Pyrophyllite
Formula: Al2Si4O10(OH)2
Colour: Golden-yellow
Description: Radiating tufts.
ⓘ Quartz
Formula: SiO2
Localities: Reported from at least 22 localities in this region.
ⓘ Quartz var. Milky Quartz
Formula: SiO2
ⓘ Rhodonite
Formula: CaMn3Mn[Si5O15]
ⓘ Ruthenium
Formula: (Ru,Ir)
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Silver ?
Formula: Ag
Description: (Probably refers to the silver content in the native gold, not to the presence of the discrete species "native silver".)
ⓘ Sphalerite
Formula: ZnS
Description: Occurs as a substantial deposit.
ⓘ Sulphur
Formula: S8
Description: Loose microcrystals filling cast left by decomposed pyrite crystal in a gold-bearing quartz vein.
ⓘ Tetraferroplatinum
Formula: PtFe
ⓘ 'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S
ⓘ Todorokite
Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O

Gallery:

Auⓘ Gold
Al2Si4O10(OH)2ⓘ Pyrophyllite
SiO2ⓘ Quartz

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
ⓘSilver ?1.AA.05Ag
ⓘRuthenium1.AF.05(Ru,Ir)
ⓘOsmium1.AF.05(Os,Ir,Ru)
ⓘPlatinum1.AF.10Pt
ⓘIridium1.AF.10(Ir,Os,Ru)
ⓘIsoferroplatinum1.AG.35Pt3Fe
ⓘTetraferroplatinum1.AG.40PtFe
ⓘSulphur1.CC.05S8
Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘBornite2.BA.15Cu5FeS4
ⓘAcanthite2.BA.35Ag2S
ⓘCovellite2.CA.05aCuS
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘCooperite2.CC.35bPtS
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
ⓘArsenopyrite2.EB.20FeAsS
ⓘPyrargyrite2.GA.05Ag3SbS3
ⓘProustite2.GA.05Ag3AsS3
ⓘ'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
Group 4 - Oxides and Hydroxides
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘvar. Milky Quartz4.DA.05SiO2
ⓘTodorokite4.DK.10(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAnkerite5.AB.10Ca(Fe2+,Mg)(CO3)2
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
ⓘAlunite7.BC.10KAl3(SO4)2(OH)6
Group 9 - Silicates
ⓘAndalusite9.AF.10Al2(SiO4)O
ⓘRhodonite9.DK.05CaMn3Mn[Si5O15]
ⓘPyrophyllite9.EC.10Al2Si4O10(OH)2
ⓘMuscovite
var. Sericite		9.EC.15KAl2(AlSi3O10)(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
ⓘ'Psilomelane'-
ⓘ'Limonite'-
ⓘ'Chlorite Group'-
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ AluniteKAl3(SO4)2(OH)6
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ PyrophylliteAl2Si4O10(OH)2
Hⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Cⓘ CalciteCaCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ AluniteKAl3(SO4)2(OH)6
Oⓘ AndalusiteAl2(SiO4)O
Oⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Oⓘ BaryteBaSO4
Oⓘ CalciteCaCO3
Oⓘ HematiteFe2O3
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ PyrophylliteAl2Si4O10(OH)2
Oⓘ QuartzSiO2
Oⓘ RhodoniteCaMn3Mn[Si5O15]
Oⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Oⓘ Quartz var. Milky QuartzSiO2
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
NaSodium
Naⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
MgMagnesium
Mgⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Mgⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
AlAluminium
Alⓘ AluniteKAl3(SO4)2(OH)6
Alⓘ AndalusiteAl2(SiO4)O
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ PyrophylliteAl2Si4O10(OH)2
Alⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ AndalusiteAl2(SiO4)O
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PyrophylliteAl2Si4O10(OH)2
Siⓘ QuartzSiO2
Siⓘ RhodoniteCaMn3Mn[Si5O15]
Siⓘ Quartz var. Milky QuartzSiO2
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sⓘ AcanthiteAg2S
Sⓘ AluniteKAl3(SO4)2(OH)6
Sⓘ ArsenopyriteFeAsS
Sⓘ BaryteBaSO4
Sⓘ BorniteCu5FeS4
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ CooperitePtS
Sⓘ CovelliteCuS
Sⓘ GalenaPbS
Sⓘ ProustiteAg3AsS3
Sⓘ PyrargyriteAg3SbS3
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
Sⓘ SulphurS8
Sⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
KPotassium
Kⓘ AluniteKAl3(SO4)2(OH)6
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ⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Caⓘ CalciteCaCO3
Caⓘ RhodoniteCaMn3Mn[Si5O15]
Caⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
MnManganese
Mnⓘ RhodoniteCaMn3Mn[Si5O15]
Mnⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
FeIron
Feⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Feⓘ ArsenopyriteFeAsS
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ HematiteFe2O3
Feⓘ IsoferroplatinumPt3Fe
Feⓘ PyriteFeS2
Feⓘ TetraferroplatinumPtFe
CuCopper
Cuⓘ BorniteCu5FeS4
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ CovelliteCuS
Cuⓘ MalachiteCu2(CO3)(OH)2
Cuⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ ArsenopyriteFeAsS
Asⓘ ProustiteAg3AsS3
SrStrontium
Srⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
RuRuthenium
Ruⓘ Iridium(Ir,Os,Ru)
Ruⓘ Osmium(Os,Ir,Ru)
Ruⓘ Ruthenium(Ru,Ir)
AgSilver
Agⓘ AcanthiteAg2S
Agⓘ ProustiteAg3AsS3
Agⓘ PyrargyriteAg3SbS3
Agⓘ SilverAg
SbAntimony
Sbⓘ PyrargyriteAg3SbS3
Sbⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
BaBarium
Baⓘ BaryteBaSO4
Baⓘ Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
OsOsmium
Osⓘ Iridium(Ir,Os,Ru)
Osⓘ Osmium(Os,Ir,Ru)
IrIridium
Irⓘ Iridium(Ir,Os,Ru)
Irⓘ Osmium(Os,Ir,Ru)
Irⓘ Ruthenium(Ru,Ir)
PtPlatinum
Ptⓘ CooperitePtS
Ptⓘ IsoferroplatinumPt3Fe
Ptⓘ PlatinumPt
Ptⓘ TetraferroplatinumPtFe
AuGold
Auⓘ GoldAu
PbLead
Pbⓘ GalenaPbS

Localities in this Region

USA
USA

Other Regions, Features and Areas containing this locality

North America PlateTectonic 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, 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

Lowell, F. L. (1916), Mines and mineral resources of the counties of Del Norte, Humboldt, Mendocino, Mariposa, Merced, San Joaquin, and Stanislaus: California Mining Bureau. (Report 14): 14: 575-600.
Castello, W.O. (1921), Mariposa County: California Mining Bureau. Report 17: 94.
Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology (Report 53): 53(1&2): 69-187.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 65-66.
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