French Hill Mine, French Hill, Spanish Dry Diggings (Spanish Dry Diggins), Greenwood District, Northwest Segment Mother Lode, El Dorado County, California, USAi
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Latitude & Longitude (WGS84):
38° 56' 15'' North , 120° 55' 17'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Auburn Lake Trails | 3,426 (2011) | 3.7km |
| Georgetown | 2,367 (2011) | 7.9km |
| Cool | 4,100 (2017) | 9.8km |
| Meadow Vista | 3,217 (2011) | 11.2km |
| Foresthill | 1,483 (2011) | 12.8km |
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 |
|---|---|---|
| El Dorado County Mineral and Gem Society | Placerville, California | 25km |
| Gold Country Treasure Seekers | Placerville, California | 25km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 34km |
| Roseville Rock Rollers | Roseville, California | 38km |
| Fossils for Fun Society, Inc. | North Highlands, California | 48km |
A former Au-asbestos mine located in the NW¼NE¼ sec. 36, T13N, R9E, MDM, 0.4 km (0.2 mile) SE of French Hill (coordinates of record) (on the SE slope of the hill), about 6 miles N of Greenwood (1 mile SW of Spanish Dry Diggings), on private land. Property holdings were 160 acres. Operated by Harriett Taylor. Operated circa 1894. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a Au-asbestos vein-seam deposit. The ore body strikes NW and dips 45E with a thickness of 0.46 meters (1.5 feet). The deposit is on a porphyry seam belt. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include surface and underground openings with a length of 60.96 meters and an overall depth of 30.48 meters. Mined by open cuts, a 100 foot shaft and a 100 foot adit. Material treated in an 800 foot sluice and 10-stamp mill.
No production records were found.
Deposit was prospected for asbestos but no record of its output was found.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chrysotile Formula: Mg3(Si2O5)(OH)4 Description: Fibrous; occurs in veins. |
| ⓘ 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 |
| Group 9 - Silicates | |||
| ⓘ | Chrysotile | 9.00. | Mg3(Si2O5)(OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| O | Oxygen | |
| O | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| O | ⓘ Quartz | SiO2 |
| Mg | Magnesium | |
| Mg | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Si | Silicon | |
| Si | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Si | ⓘ Quartz | SiO2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10006863 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- California
- Mother Lode BeltBelt
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060170207
