Janie Boyd Mine (Sanches; Holmes Mine), Campo Seco, Campo Seco Mining District, Foothill Copper Belt, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
38° 12' 42'' North , 120° 50' 43'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Valley Springs | 3,553 (2011) | 2.6km |
| Rancho Calaveras | 4,489 (2018) | 9.4km |
| Camanche North Shore | 979 (2017) | 10.2km |
| Buena Vista | 429 (2011) | 10.9km |
| Wallace | 403 (2011) | 11.8km |
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 |
|---|---|---|
| Amador County Gem & Mineral Society | Sutter Creek, California | 20km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 31km |
| Stockton Lapidary & Mineral Club | Stockton, California | 48km |
A former lode and placer Au mine located in secs. 2 & 11, T4N, R10E, MDM, 1.8 km (1.1 miles) SSE of Campo Seco. Operated prior to and during 1935 into 1936. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in greenstone and slate. The ore body strikes W and dips 75S at a thickness of 1.83 meters. There are 12 parallel veins from 8 inches (20 cm) to 12 feet (3.8 meters) in thickness. A placer was also worked on the claim. Sulfides are present. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings comprised of a 500 foot SE adit, a 45 foot inclined (40 degrees) winze approximately 100 feet from the portal, plus a 185 foot adit on the W side of the hill.
Production data are found in: Logan, Clarence August and Franke, H. (1936).
Ore was blocked out in 1935.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10102609 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090566
Bramel, Hadley R., Heyl, George R., Cox, Manning W., Ransome, Alfred L., Eric, John H., Wyant, Donald G. (1948) Copper in California. Bulletin 144. California State Mining Bureau p.220
