Comet Mine (Republic group; Alhambra group), Cornish House, American Hill Mining District, Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Comet Mine (Republic group; Alhambra group) | Mine |
| Cornish House | - not defined - |
| American Hill Mining District | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 30' 54'' North , 120° 46' 8'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 7.0km |
| Sierra City | 221 (2011) | 12.9km |
| Washington | 185 (2011) | 17.5km |
| Pike | 134 (2011) | 21.4km |
| Camptonville | 158 (2011) | 25.0km |
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 | 41km |
A former lode Au-Cu occurrence/mine located in the W½W½ sec. 17, T19N, R11E, MDM, 1.7 km (1.0 mile) NE of Cornish House, W of Jim Crow Creek and ENE of Cornish Flat (4 miles SE of Downieville), on National Forest land. The property is comprised of 2 claims. MRDS database accuracy for this location is not stated. Assessment work occurred in 1916.
Mineralization is a vein deposit hosted in slate & porphyry. The ore body strikes NNW and dips 40W at a thickness of 9.14 meters. There are 6 parallel veins. The Comet veins have a slate hanging wall and a porphyry footwall. Comet No. 1 vein is 3 feet thick and the No. 2 is 10 feet thick. The Alhambra vein is 6 to 8 feet thick and strikes N10W and dips 80W. The country rock is decomposed and altered. The Alhambra has a porphyry footwall and a slate hanging wall. A 30 foot lode occurs on the Comet vein and was said to vary between $1.00 and $9.00 (period values) Au/ton for 14 feet of thickness. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include surface and underground openings with an overall depth of 26.52 meters, an overall length of 91.44 meters, and an overall width of 1,828.8 meters. There are 4 adits with the Comet adit at 350 feet, with numerous crosscuts. The Alhambra adit is 380 feet.
Production data are found in: Preston, E.B. (1893).
No other production record was found.
Analytical data results: 5% sulfides.
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 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 | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10034809 |
|---|
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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