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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):
33.79675,-114.90771
GeoHash:
G#: 9qn230wb2
GRN:
N23W69
KΓΆppen climate type:
BWh : Hot deserts climate
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):
ec5bb57d-ab8b-4b39-8d49-1ef1e27a5f6f


A former Cu-Ag-Au occurrence/mine located in the NΒ½ 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

Detailed Mineral List:

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

Gallery:

List of minerals arranged by Strunz 10th Edition classification

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

List of minerals for each chemical element

HHydrogen
Hβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Hβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ JarositeKFe33+(SO4)2(OH)6
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ CerussitePbCO3
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Oβ“˜ CalciteCaCO3
Oβ“˜ CerussitePbCO3
Oβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oβ“˜ CupriteCu2O
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ HematiteFe2O3
Oβ“˜ JarositeKFe33+(SO4)2(OH)6
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Oβ“˜ QuartzSiO2
Oβ“˜ Garnet GroupX3Z2(SiO4)3
MgMagnesium
Mgβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
AlAluminium
Alβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Alβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
SiSilicon
Siβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Siβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ QuartzSiO2
Siβ“˜ Garnet GroupX3Z2(SiO4)3
SSulfur
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ ChalcociteCu2S
Sβ“˜ GalenaPbS
Sβ“˜ JarositeKFe33+(SO4)2(OH)6
Sβ“˜ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Sβ“˜ PyriteFeS2
Sβ“˜ SphaleriteZnS
KPotassium
Kβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Kβ“˜ JarositeKFe33+(SO4)2(OH)6
CaCalcium
Caβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caβ“˜ CalciteCaCO3
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeIron
Feβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ HematiteFe2O3
Feβ“˜ JarositeKFe33+(SO4)2(OH)6
Feβ“˜ PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Feβ“˜ PyriteFeS2
CuCopper
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ ChalcociteCu2S
Cuβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuβ“˜ CupriteCu2O
Cuβ“˜ MalachiteCu2(CO3)(OH)2
ZnZinc
Znβ“˜ SphaleriteZnS
PbLead
Pbβ“˜ CerussitePbCO3
Pbβ“˜ GalenaPbS
Pbβ“˜ PlumbojarositePb0.5Fe33+(SO4)2(OH)6

Other Databases

Link to USGS MRDS:10077109

Other Regions, Features and Areas containing this locality

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

U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060650280.
Tucker, W. Burling (1924), Imperial, Inyo, Kern, Los Angeles, Riverside, San Bernardino, San Diego, Ventura Counties: California Mining Bureau. Report 20: 195.
Tucker, W. Burling and Reid J. Sampson (1945), Mineral resources of Riverside County: California Journal of Mines and Geology, California Division Mines (Report 41): 41(3): 124-125.
Bramel, Hadley R., Heyl, George R., Cox, Manning W., Ransome, Alfred L., Eric, John H., Wyant, Donald G. (1948) Copper in California. Bulletin 144. California State Mining Bureau pp.291-292
Saul, R.B., Evans, J.R., and Gray, C.H. (1970) Mines and mineral resources of Riverside County. California Division of Mines and Geology County Report 9. Unpublished manuscript: 814-816.
California Division of Mines and Geology Open-File Report 77-14 (1977): tabulated list, 190-193.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Kohler-Antablin, S. (1994) Mineral Land Classification of the Eastern Half of Riverside County, California. California Division of Mines and Geology Open-File Report 94-11.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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