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Red Ledge Mine, Washington, Washington Mining District (Omega Mining District), Nevada County, California, USAi
Regional Level Types
Red Ledge MineMine
WashingtonVillage
Washington Mining District (Omega Mining District)Mining District
Nevada CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
39° 20' 39'' North , 120° 48' 3'' West
Latitude & Longitude (decimal):
39.34429,-120.80103
GeoHash:
G#: 9qfpg47m5
GRN:
N27W67
Type:
Mine
KΓΆppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Washington185 (2011)1.7km
Alta610 (2011)15.3km
Dutch Flat160 (2011)15.7km
Pike134 (2011)19.9km
Nevada City3,152 (2017)20.8km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Nevada County Gem & Mineral SocietyGrass Valley, California26km
Mindat Locality ID:
3515
Long-form identifier:
mindat:1:2:3515:9
GUID (UUID V4):
431ea9f0-53fd-422a-8ec3-742aea917a75


A former Au-Cr-Fe mine located in sec. 12 & in the NWΒΌNEΒΌ sec. 13, T17N, R10E, MDM, about 2 miles SW of Washington, on National Forest land. MRDS database stated accuracy for this location is 10 meters.

Note: not to be confused with Red Ledge mine in Sierra Co.

Gold-bearing quartz lode occurs along a major fault between serpentinized ultramafic rocks and amphibole schist of the Tightner Formation. The 10 to 30-foot lode extends about 8,000 feet. The gold occurs as leaves and plates in quartz, often accompanied by mariposite and ankerite gangue. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Gold Mine: The gold/quartz veins occur in the sedimentary rocks close to the contact with serpentinite. Mariposite is often in association with the serpentine, and in close proximity to the gold.

Chromite Mine: The Chromite occurs in lenses and pods in the serpentine, close to the contact with the sedimentary rocks. Chromite was produced from the Red Ledge in the 1918-19 time period. The ore grade was 45%.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


18 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

β“˜ Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
β“˜ Arsenopyrite
Formula: FeAsS
β“˜ Calcite
Formula: CaCO3
β“˜ 'Chlorite Group'
β“˜ Chromite
Formula: Fe2+Cr3+2O4
β“˜ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Description: Abundant. Associated with calcite crystals.
β“˜ Clinochlore var. Chromium-bearing Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Description: Abundant. Associated with calcite crystals.
β“˜ Copper
Formula: Cu
β“˜ Galena
Formula: PbS
β“˜ Gold
Formula: Au
Description: Superb specimens of crystallized gold from a pocket 1Β½ inches x 1Β½ inches (3.75 cm x 3.75 cm).
β“˜ Knorringite
Formula: Mg3Cr2(SiO4)3
β“˜ Magnesiochromite
Formula: MgCr2O4
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Muscovite var. Mariposite
Formula: K(Al,Cr)2(Al,Si)4O10(OH)2
β“˜ Muscovite var. Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ Redledgeite (TL)
Formula: Ba(Ti4+6Cr3+2)O16
Type Locality:
Colour: Black
Description: Small, brilliant crystals with chromian clinochlore on chromite.
β“˜ Rutile
Formula: TiO2
Description: Chromian variety.
References:
Dana 7:I:559.
β“˜ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
β“˜ Stibnite
Formula: Sb2S3
β“˜ Talc
Formula: Mg3Si4O10(OH)2
β“˜ Uvarovite
Formula: Ca3Cr2(SiO4)3
Colour: Green
Description: Occurs as fine crystals coating chromite.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Gold1.AA.05Au
β“˜Copper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
β“˜Galena2.CD.10PbS
β“˜Stibnite2.DB.05Sb2S3
β“˜Pyrite2.EB.05aFeS2
β“˜Arsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
β“˜Magnesiochromite4.BB.05MgCr2O4
β“˜Chromite4.BB.05Fe2+Cr3+2O4
β“˜Quartz4.DA.05SiO2
β“˜Rutile4.DB.05TiO2
β“˜Redledgeite (TL)4.DK.05bBa(Ti4+6Cr3+2)O16
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Group 9 - Silicates
β“˜Knorringite9.AD.25Mg3Cr2(SiO4)3
β“˜Uvarovite9.AD.25Ca3Cr2(SiO4)3
β“˜Talc9.EC.05Mg3Si4O10(OH)2
β“˜Muscovite
var. Phengite		9.EC.15KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
β“˜9.EC.15KAl2(AlSi3O10)(OH)2
β“˜var. Mariposite9.EC.15K(Al,Cr)2(Al,Si)4O10(OH)2
β“˜Clinochlore
var. Chromium-bearing Clinochlore		9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
β“˜9.EC.55Mg5Al(AlSi3O10)(OH)8
Unclassified
β“˜'Chlorite Group'-
β“˜'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Hβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Hβ“˜ TalcMg3Si4O10(OH)2
Hβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Hβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
Cβ“˜ AnkeriteCa(Fe2+,Mg)(CO3)2
Cβ“˜ CalciteCaCO3
OOxygen
Oβ“˜ AnkeriteCa(Fe2+,Mg)(CO3)2
Oβ“˜ CalciteCaCO3
Oβ“˜ ChromiteFe2+Cr23+O4
Oβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Oβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Oβ“˜ KnorringiteMg3Cr2(SiO4)3
Oβ“˜ MagnesiochromiteMgCr2O4
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Oβ“˜ QuartzSiO2
Oβ“˜ RedledgeiteBa(Ti64+Cr23+)O16
Oβ“˜ RutileTiO2
Oβ“˜ TalcMg3Si4O10(OH)2
Oβ“˜ UvaroviteCa3Cr2(SiO4)3
Oβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Oβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
MgMagnesium
Mgβ“˜ AnkeriteCa(Fe2+,Mg)(CO3)2
Mgβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Mgβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Mgβ“˜ KnorringiteMg3Cr2(SiO4)3
Mgβ“˜ MagnesiochromiteMgCr2O4
Mgβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Mgβ“˜ TalcMg3Si4O10(OH)2
AlAluminium
Alβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Alβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Alβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
SiSilicon
Siβ“˜ ClinochloreMg5Al(AlSi3O10)(OH)8
Siβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Siβ“˜ KnorringiteMg3Cr2(SiO4)3
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ TalcMg3Si4O10(OH)2
Siβ“˜ UvaroviteCa3Cr2(SiO4)3
Siβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Siβ“˜ Serpentine SubgroupD3[Si2O5](OH)4
SSulfur
Sβ“˜ ArsenopyriteFeAsS
Sβ“˜ GalenaPbS
Sβ“˜ PyriteFeS2
Sβ“˜ StibniteSb2S3
KPotassium
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Kβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
CaCalcium
Caβ“˜ AnkeriteCa(Fe2+,Mg)(CO3)2
Caβ“˜ CalciteCaCO3
Caβ“˜ UvaroviteCa3Cr2(SiO4)3
TiTitanium
Tiβ“˜ RedledgeiteBa(Ti64+Cr23+)O16
Tiβ“˜ RutileTiO2
CrChromium
Crβ“˜ ChromiteFe2+Cr23+O4
Crβ“˜ Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Crβ“˜ KnorringiteMg3Cr2(SiO4)3
Crβ“˜ MagnesiochromiteMgCr2O4
Crβ“˜ RedledgeiteBa(Ti64+Cr23+)O16
Crβ“˜ UvaroviteCa3Cr2(SiO4)3
Crβ“˜ Muscovite var. MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
FeIron
Feβ“˜ AnkeriteCa(Fe2+,Mg)(CO3)2
Feβ“˜ ArsenopyriteFeAsS
Feβ“˜ ChromiteFe2+Cr23+O4
Feβ“˜ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Feβ“˜ PyriteFeS2
CuCopper
Cuβ“˜ CopperCu
AsArsenic
Asβ“˜ ArsenopyriteFeAsS
SbAntimony
Sbβ“˜ StibniteSb2S3
BaBarium
Baβ“˜ RedledgeiteBa(Ti64+Cr23+)O16
AuGold
Auβ“˜ GoldAu
PbLead
Pbβ“˜ GalenaPbS

Other Databases

Link to USGS MRDS:10031922

Other Regions, Features and Areas containing this locality

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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

(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060570726
Trask, John Boardman (1853) Report on the geology of the Sierra Nevada, or California Range: California Legislature, 4th. sess., Ap. To Jour., S. Doc. 59, 30 pages: 25.
Hanks, Henry Garber (1884) Fourth report of the State Mineralogist. California Mining Bureau, Report 4, 410 pages (includes catalog of minerals of California pages 63-410), and miscellaneous observations on mineral products): 137.
Bradley, W.W., Huguenin, Emile, Logan, C.A., Tucker, W.B., Waring, C.A. (1918) Manganese and chromium in California: California Mining Bureau. Bulletin 76, 248 pages: 158.
Logan, Clarence August (1918) Unpublished Field Report, Nevada County No. 203, Red Ledge.
MacBoyle, Errol (1919) Mines and mineral resources of Nevada County. California Mining Bureau Report 16, 270 pages (published as a separate chapter): 63, 67, 77.
Gordon, Samuel G., Shannon, E.V. (1928) Chromrutile a new mineral from California. American Mineralogist, 13, 69.
Melhase, John (1935) Some garnet localities of California. Mineralogist, 3(11), 23.
Rocks & Minerals (1939) 14, 337.
Bradley, W.W. (1940) Thirty-sixth report of the State Mineralogist: California Division Mines Report 36: 69.
Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.pp.559-560
Rynearson, Garn Arthur (1953) Geological investigations of chromite in California: Chromite deposits in the northern Sierra Nevada, California. California Division of Mines and Geology Bulletin 134, part 3, chapter 5: 239.
Anonymous (1957) World news on mineral occurrences. Rocks & Minerals, 32, 12.
Strunz, Hugo (1961) β€œChromrutil” von der Red Ledge mine ist kein rutil: Redledgeite. Neues Jahrbuch fΓΌr Mineralogie, Monatshefte, 107-111.
Strunz, Hugo (1963) Redledgeite, eine TiO2-einlagerungestruktur analog kryptomelan. Neues Jahrbuch fΓΌr Mineralogie, Monatshefte, 5, 116-119.
McCulloch, W.C., Oesterling, W.A., Spurck, W.H., Tischler, M.S. (1964) Minerals for Industry, Northern California, Southern Pacific Company, Vol. II, 31.
Murdoch, Joseph, Webb, Robert W. (1966) Minerals of California, Centennial Volume (1866-1966). California Division Mines & Geology Bulletin 189: 118, 136, 137, 141, 143, 194, 203, 256, 319, 350.
Bancroft, Peter (1973) The World's Finest Minerals and Crystals.p.154
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Bancroft, Peter (1984) Gem & Crystal Treasures. Western Enterprises, Fallbrook CA, with the Mineralogical Record Inc, Tucson, Arizona. p.1-488.pp.89-89
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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