Mariposa Mine, Chips Flat, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Mariposa Mine | Mine |
| Chips Flat | Flat |
| Alleghany Mining District (Forest Mining District) | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 27' 51'' North , 120° 50' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 10.6km |
| Washington | 185 (2011) | 12.0km |
| Pike | 134 (2011) | 14.3km |
| Camptonville | 158 (2011) | 18.4km |
| Sierra City | 221 (2011) | 20.6km |
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 | 33km |
A former lode Au occurrence/mine located in the NE¼ sec. 3, T18N, R10E, MDM, 0.5 km (0.3 mile) N of Chips Flat (coordinates of record) and 1.0 km (0.6 mile) SE of Alleghany, on National Forest land. Owned by the Ophir Mining Company in 1925. MRDS database stated accuracy for this location is 1,000 meters. Around 1918 this property included the Eclipse claim. Idle since about 1902.
Mineralization is a vein deposit hosted in serpentinite, schist and gabbro. The ore body strikes N48W and dips 54NE at a thickness of 0.61 meter. The deposit is a fissure vein 18 inches (45 cm) to 2 feet (0.61 meter) thick. The footwall is serpentine and the hanging wall is schist. The amphibolite schist is cut on each side of the vein by irregular dikes of serpentine. This is the southern continuation of the Ophir vein. The vein is well-defined but in the S part of the adit it has numerous small branches. A small, W-dipping vein E of the adit agrees in projection with a fault on the 2,100 level of the Sixteen-to-One Mine. Local rocks include Mesozoic gabbroic rocks, unit 2 (undivided) and/or undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided).
Workings include underground openings with an overall depth of 42.67 meters and comprised of several adits and drifts on the same vein.
Production data are found in: Ferguson and Gannett (1932).
Total production, including the Eclipse Mine, was estimated to be $118,000 (period values).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10103099 |
|---|
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 #0060910126
