Everlasting Mine (Sciefford Ranch; Best & Belcher Mining Company), San Andreas, San Andreas Mining District, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
38° 11' 10'' North , 120° 41' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| San Andreas | 2,783 (2011) | 1.2km |
| Valley Springs | 3,553 (2011) | 12.7km |
| Mokelumne Hill | 646 (2011) | 12.9km |
| Mountain Ranch | 1,628 (2011) | 13.4km |
| Rancho Calaveras | 4,489 (2018) | 16.5km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 18km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 25km |
A former lode Au mine located at the center of the boundary between secs. 19 & 20, T4N, R12E, MDM, 1.2 km (3,900 feet) SSW of San Andreas. Operated intermittently during the 1870's, 1880's, 1890's, 1900, 1935 to 1962. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in greenstone and serpentinite. The ore body strikes NW and dips NE at a thickness of 2.44 meters. Amphibolite occurs to the E and metasediments of the Calaveras Formation to the W. The vein system is irregular with heavy gouge on both walls. Much of the quartz is crushed and mixed with gouge. The hanging wall is serpentine, and the footwall is greenstone. The vein is from 8 to 14 feet thick at 65 feet of depth in the N shaft. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include underground openings with an overall depth of 94.49 meters and an overall length of 60.96 meters, and comprised of 2 shafts at 225 and 300 feet deep, 1,000 feet apart.
Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).
Analytical data results: Reported to run $3.50 to $16 (period values) per ton Au.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 Description: Comprises country rock. |
Gallery:
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 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10028869 |
|---|
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
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090461
