Lost Treasure Mine (Comet vein; Lost Treasure vein), Old Mountain House, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
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Latitude & Longitude (WGS84):
39° 30' 3'' North , 120° 52' 43'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 7.9km |
| Pike | 134 (2011) | 12.3km |
| Camptonville | 158 (2011) | 15.6km |
| Washington | 185 (2011) | 17.1km |
| Sierra City | 221 (2011) | 22.2km |
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 | 35km |
A former Au occurrence/mine located in sec. 20, T19N, R10E, MDM, 1.1 km (0.7 mile) E of Old Mountain House, W of Lucky Dog Creek (4 miles SSW of Downieville), on National Forest land. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit. The ore body strikes WNW and dips 45S at a thickness of 2.44 meters. There are 2 veins. The Lost Treasure vein is 400 feet E of the Comet vein. The Lost Treasure is a fissure vein 1 to 8 feet thick filled with quartz & porphyry. Both vein walls are porphyry. The Comet is a fissure vein striking E and dipping 45S at 2 feet thick carrying _______ (data missing in USGS MRDS database file) with porphyry walls. Gold occurs in near-surface oxidized ore. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings with an overall depth of 12.19 meters and an overall length of 457.2 meters and comprised of a 70 foot adit on the Lost reasure vein and open cuts and a 12 foot shaft on the Comet vein.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10086663 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker 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 #0060910213
