David prospect, Georgetown, Georgetown District, East Segment Mother Lode, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| David prospect | Prospect |
| Georgetown | Census-designated Place |
| Georgetown District | Mining District |
| East Segment Mother Lode | Lode |
| El Dorado County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 54' 20'' North , 120° 51' 16'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Georgetown | 2,367 (2011) | 1.4km |
| Auburn Lake Trails | 3,426 (2011) | 8.5km |
| Coloma | 529 (2011) | 12.1km |
| Foresthill | 1,483 (2011) | 13.1km |
| Cool | 4,100 (2017) | 14.0km |
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 |
|---|---|---|
| El Dorado County Mineral and Gem Society | Placerville, California | 20km |
| Gold Country Treasure Seekers | Placerville, California | 20km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 39km |
| Roseville Rock Rollers | Roseville, California | 41km |
A Mn occurrence located in the SW¼NW¼ sec. 10, T12N, R10E, MDM, 1.4 km (0.9 mile/4,800 feet) W of Georgetown, along the Georgetown divide ditch. Discovered in 1942, on National Forest land. Owned by D. David, California (1974). MRDS database stated accuracy for this location is 1,000 meters.
The ore body strikes N10E and dips 60E at a thickness of 0.61 meters and a width of 4.57 meters. Psilomelane and pyrolusite are mixed with limonite in stringers penetrating chert (recrystallized to very fine-grained chert to some extent. The stringers are usually not over ½ to 1 inch (1.25 to 2.5 cm) thick, and more or less run parallel to the bedding. The chert appears to be surrounded by sericite schist. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include surface openings comprised of open cuts.
Analytical data results: average grade is 5 to 10% Mn.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ 'Limonite' |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Description: Occurs as sericite schist surrounding fine-grained chert. |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Description: Occurs as sericite schist surrounding fine-grained chert. |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | Oxygen | |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10030033 |
|---|
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 #0060170003
