Donnallan Mine, San Andreas, San Andreas Mining District, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Donnallan Mine | Mine |
| San Andreas | Census-designated Place |
| San Andreas Mining District | Mining District |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 13' 19'' North , 120° 41' 33'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| San Andreas | 2,783 (2011) | 3.1km |
| Mokelumne Hill | 646 (2011) | 8.8km |
| Valley Springs | 3,553 (2011) | 12.4km |
| Mountain Ranch | 1,628 (2011) | 13.3km |
| Jackson | 4,649 (2017) | 15.8km |
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 | 21km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 22km |
A former lode Au mine located in sec. 6, T4N, R12E, MDM, 3.1 km (1.9 miles) NNW of San Andreas, along highway 49. Operated around 1896. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in rocks of the Amador Group (slate, schist). The ore body dips W at a width of 60.96 meters. The vein is a zone 40 to 200 feet wide in weathered talcose slate and schist. Quartz and calcite veins, most of which dip W, one 4 feet, dips 40E, are exposed in then open cut. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include surface openings comprised of an open cut.
No production record was found.
Analytical data results: The ore averaged $2.50 (period values) per ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Description: Occurs as a component of talcose slate. |
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 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10028848 |
|---|
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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