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Red Ledge Mine (Bank Mining Company), Mack House, Alleghany Mining District (Forest Mining District), Sierra Co., California, USAi
Regional Level Types
Red Ledge Mine (Bank Mining Company)Mine
Mack House- not defined -
Alleghany Mining District (Forest Mining District)Mining District
Sierra Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
39° 26' 41'' North , 120° 54' 27'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Pike134 (2011)7.8km
Camptonville158 (2011)12.1km
Washington185 (2011)13.3km
Downieville282 (2011)14.5km
North San Juan269 (2011)18.8km


Placer & lode Au occurrences/mines and a Ni occurrence located in secs. 1 & 12, T18N, R9E, & in secs. 6 & 7, T18N, R10E, MDM, 3.6 km (2.2 miles) WSW of Mack House and about 7 km WSW of Alleghany, N of Kanaka Creek, near the Shannon Mine, on National Forest land. Discovered in 1855. MRDS database stated accuracy for this location is 1,000 meters. On S slope of Pliocene Ridge in Tahoe National Forest; 6 miles to Alleghany by graded dirt road. Gold was recovered from lode and placer deposits since the middle 1850s. Nickeliferous laterite was identified in 1975.

Mineralization is a deposit hosted in Late Cretaceous serpentinite and carbonate. The area is underlain by a prominent mass of serpentinite that is intrusive into older rocks of the Calaveras Group and Taylor formation. Locally, especially near the Red Ledge Mine, serpentinite was altered to silica-carbonate rock, which consists of mariposite, ankerite, secondary quartz veinlets, and magnetite. The mariposite is Ni-bearing. Lying upon serpentinite and silica-carbonate rock is mantle of deep, Ni-bearing, reddish-brown laterite and silica boxwork, up to 50 feet deep in places. Range and average depth are unknown. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include unspecified surface openings.

Chip samples assayed at 0.30% Ni.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
Gold
Formula: Au
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
'Mariposite'
Formula: K(Al,Cr)2(Al,Si)4O10(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
Muscovite var: Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
Quartz
Formula: SiO2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Phengite9.EC.15KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2
Muscovite
var: Phengite
-KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
OOxygen
O AnkeriteCa(Fe2+,Mg)(CO3)2
O MagnetiteFe2+Fe23+O4
O MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
O QuartzSiO2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O MuscoviteKAl2(AlSi3O10)(OH)2
O Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
AlAluminium
Al MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
SiSilicon
Si MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Si QuartzSiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
KPotassium
K MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
CrChromium
Cr MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe MagnetiteFe2+Fe23+O4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ferguson, Henry G. and R.W. Gannett (1932) Gold quartz veins of the Alleghany district, California, USGS Professional Paper 172.
Averill, Charles V. (1942) Mineral resources of Sierra County: California Journal of Mines and Geology, California Division Mines (Report 38): 38(1): 63.
Carlson, D.W. and W.B. Clark (1956) Lode gold mines of the Alleghany-Downieville area, Sierra County, California: California Journal of Mines and Geology (Report 52): 52(3): 237-291.
Chesterman, C.W. (1976) written communication to USGS MRDS staff.
USGS (2005) Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033789 & 10262096.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060910006.

Other Databases

USGS MRDS Record:10033789

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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