Telegraph Mining Company Mine, Fir Cap, Downieville Mining District, Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Telegraph Mining Company Mine | Mine |
| Fir Cap | - not defined - |
| Downieville Mining District | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 37' 10'' North , 120° 51' 59'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 7.5km |
| Plumas Eureka (historical) | 339 (2011) | 20.6km |
| Sierra City | 221 (2011) | 20.8km |
| Pike | 134 (2011) | 23.0km |
| Camptonville | 158 (2011) | 24.3km |
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 | 48km |
A former lode & placer Au occurrence/mine located in the NW¼ sec. 9, T20N, R10E, MDM, 1.0 km (0.6 mile) W of Fir Cap (summit) (coordinates of record), along the E canyon wall of Goodyears Creek (W slope of Fir Cap) (3¾ miles NNW of Downieville), on National Forest wilderness land (Roadless Area Review & Evaluation (RARE II) Area West Yuba Rare II Area)(located claim). MRDS database stated accuracy for this location is 10 meters. The literature gives sec. 4; however, the USGS quadrangle shows sec. 9, with the adit entrance in the NW¼. Worked until 1910 (?) as a placer mine.
Mineralization is a vein deposit and a gold-bearing Tertiary gravel channel deposit. The quartz vein is capped by lava. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include surface and underground openings with an overall depth of 10.67 meters and comprised of a 1,500 foot adit, 2 shafts (one 65 feet deep not on the vein; the other 35 feet deep on the vein), plus a 50 foot drift and a 30 foot stope on the vein. The workings contained bad air due to no ventilation. Two mills were carried away by snowslide.
Production data are found in: MacBoyle, Errol (1920b).
No other production record was found.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10086545 |
|---|
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 #0060910275
