Red Ledge Mine (Bank Mining Company), Mack House, Alleghany Mining District (Forest Mining District), Sierra County, 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 County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 26' 41'' North , 120° 54' 27'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Pike | 134 (2011) | 7.8km |
| Camptonville | 158 (2011) | 12.1km |
| Washington | 185 (2011) | 13.3km |
| Downieville | 282 (2011) | 14.5km |
| North San Juan | 269 (2011) | 18.8km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 28km |
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 Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Mariposite Formula: K(Al,Cr)2(Al,Si)4O10(OH)2 |
| ⓘ Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| ⓘ | var. Mariposite | 9.EC.15 | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| H | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| K | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Cr | Chromium | |
| Cr | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10033789 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060910006
Red Ledge Mine, Mack House, Alleghany Mining District, Sierra County, California, USA