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⇱ Crescent Copper group [1] (Crescent group; Badger State group; Eagle Nest Mine; Eagle Nest No. 7 claim), McCoy Spring, Arlington District (Ironwood District), McCoy Mts (Ironwood Mts), Riverside County, California, USA

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Crescent Copper group [1] (Crescent group; Badger State group; Eagle Nest Mine; Eagle Nest No. 7 claim), McCoy Spring, Arlington District (Ironwood District), McCoy Mts (Ironwood Mts), Riverside County, California, USAi
Regional Level Types
Crescent Copper group [1] (Crescent group; Badger State group; Eagle Nest Mine; Eagle Nest No. 7 claim)- not defined -
McCoy SpringSpring
Arlington District (Ironwood District)Mining District
McCoy Mts (Ironwood Mts)Mountain Range
Riverside CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
33° 47' 48'' North , 114° 54' 27'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Mesa Verde1,023 (2011)26.8km
Blythe19,208 (2017)35.5km
Ripley692 (2011)38.1km
Ehrenberg1,470 (2011)41.3km
Palo Verde171 (2011)43.6km
Mindat Locality ID:
86874
Long-form identifier:
mindat:1:2:86874:4
GUID (UUID V4):
0


A former Cu-Ag-Au occurrence/mine located in the N½ sec. 30, T4S, R20E, SBM, 7.1 km (4.4 miles) N of McCoy Spring (coordinates of record), along the E slope, N end of the McCoy Mountains (7 miles SW of Inca siding). MRDS database stated accuracy for this location is 500 meters. Operated during the periods 1907 to 1909 & 1916.

NOTE: USGS MRDS database file #10077109 presents geographic coordinates of 33.86894, -114.75913, but gives the same T&R value except sec. 29 is also included. Both referenced MRDS database files present MRDS file #10164624 as a related file; however, that file pertains to a locality in sec. 18, T7S, R15E, SBM.

Mineralization is a vein deposit hosted in schist and granite. The ore body strikes N20E and dips 70E at a width of 0.61 meters. Controls for ore emplacement included a shear zone and fractures. Schist occurs between granite walls. A 20- to 30-foot wide shear zone occurs in granite. It strikes N70W and dips 35N with a surface length of 12,000 feet. Mineralization occurs in a series of cross-fractures within the shear zone. The veins are of quartz & calcite. Local rocks include Mesozoic volcanic rocks, unit 3 (Mojave Desert, Death Valley area, and Eastern Sierra Nevada) and/or Quaternary alluvium and marine deposits.

Workings include underground openings with a length of 914.4 meters. The principal development is on the Eagle Nest No. 7 claim and is comprised of a tunnel driven E for 200 feet that cut a series of parallel veins 75 feet from the portal. Numerous other workings are on the property and total 3,000 feet.

Production data are found in: Tucker, W.B. (1945): 124-125.

Production statistics: Year: 1909 (period = 1909); ore (accurate): ^Au 0.4 ounce/ton; Ag: 8 ounces/ton; Cu: 23.42%. Recovery percentages: Ag = 11 grams/metric ton; Au = 226 grams/metric ton; Cu = 23 weight percent. Total production was $7,000 (period values).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


17 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

Entries shown in red are rocks recorded for this region.

Detailed Mineral List:

ⓘ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘ Annite
Formula: KFe2+3(AlSi3O10)(OH)2
ⓘ Calcite
Formula: CaCO3
ⓘ Cerussite
Formula: PbCO3
ⓘ Chalcocite
Formula: Cu2S
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ Cuprite
Formula: Cu2O
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Galena
Formula: PbS
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Hematite
Formula: Fe2O3
ⓘ Jarosite
Formula: KFe3+3(SO4)2(OH)6
Description: A vein mineral.
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
ⓘ Plumbojarosite
Formula: Pb0.5Fe3+3(SO4)2(OH)6
ⓘ Pyrite
Formula: FeS2
ⓘ Quartz
Formula: SiO2
ⓘ Sphalerite
Formula: ZnS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘCuprite4.AA.10Cu2O
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘCerussite5.AB.15PbCO3
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘJarosite7.BC.10KFe3+3(SO4)2(OH)6
ⓘPlumbojarosite7.BC.10Pb0.5Fe3+3(SO4)2(OH)6
Group 9 - Silicates
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘAnnite9.EC.20KFe2+3(AlSi3O10)(OH)2
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Unclassified
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ AnniteKFe32+(AlSi3O10)(OH)2
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ JarositeKFe33+(SO4)2(OH)6
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
CCarbon
Cⓘ CalciteCaCO3
Cⓘ CerussitePbCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ AnniteKFe32+(AlSi3O10)(OH)2
Oⓘ CalciteCaCO3
Oⓘ CerussitePbCO3
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ CupriteCu2O
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ HematiteFe2O3
Oⓘ JarositeKFe33+(SO4)2(OH)6
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Oⓘ QuartzSiO2
Oⓘ Garnet GroupX3Z2(SiO4)3
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
AlAluminium
Alⓘ AnniteKFe32+(AlSi3O10)(OH)2
Alⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ AnniteKFe32+(AlSi3O10)(OH)2
Siⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ QuartzSiO2
Siⓘ Garnet GroupX3Z2(SiO4)3
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ GalenaPbS
Sⓘ JarositeKFe33+(SO4)2(OH)6
Sⓘ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
KPotassium
Kⓘ AnniteKFe32+(AlSi3O10)(OH)2
Kⓘ JarositeKFe33+(SO4)2(OH)6
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ CalciteCaCO3
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ AnniteKFe32+(AlSi3O10)(OH)2
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ HematiteFe2O3
Feⓘ JarositeKFe33+(SO4)2(OH)6
Feⓘ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Feⓘ PyriteFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ CupriteCu2O
Cuⓘ MalachiteCu2(CO3)(OH)2
ZnZinc
Znⓘ SphaleriteZnS
PbLead
Pbⓘ CerussitePbCO3
Pbⓘ GalenaPbS
Pbⓘ PlumbojarositePb0.5Fe33+(SO4)2(OH)6

Other Databases

Link to USGS MRDS:10077109

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