Williams prospect, Somerset, Fairplay Mining District, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| Williams prospect | Prospect |
| Somerset | - not defined - |
| Fairplay Mining District | Mining District |
| El Dorado County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 40' North , 120° 43' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Camino | 1,750 (2011) | 8.7km |
| Diamond Springs | 11,037 (2011) | 9.1km |
| Deer Park | 1,384 (2018) | 9.4km |
| Placerville | 10,650 (2017) | 10.0km |
| River Pines | 379 (2011) | 13.6km |
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 | 10km |
| Gold Country Treasure Seekers | Placerville, California | 10km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 31km |
Mindat Locality ID:
78402
Long-form identifier:
mindat:1:2:78402:6
GUID (UUID V4):
17172e37-850d-4e36-9305-c731d79bf6b7
A W occurrence/prospect located in the NWΒΌ sec. 1, T9N, R11E, MDM, 3.5 km (2.2 miles) NW of Somerset, high on the S slope of a ridge, N of the headwaters area of Long Ravine (1 mile NW of Buck's Bar; 7 miles SE of Placerville). Discovered in 1954. Operated by F. T. Lee and J. Needham. Prospected in 1956. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in Calaveras Group quartzite and mica schist. The ore body is pinch & swell in form. The tactite pinches out near the surface and widens at depth. The greatest width of exposed tactite is about 12 feet. The scheelite is in thin parallel streaks near the center of the tactite body. Associated rocks include diorite. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).
Workings include surface openings comprised of an open cut 20 feet long, 20 feet wide and 15 feet high.
Production data are found in: Clark and Carlson (1956).
In 1956, several tons of ore were mined for a milling test. Analyses showed that part of the deposit contains 1 to 2% WO3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Calcite Formula: CaCO3 |
| β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| β 'Garnet Group' Formula: X3Z2(SiO4)3 |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| β Scheelite Formula: Ca(WO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| β | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 9 - Silicates | |||
| β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| β | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| C | Carbon | |
| C | β Calcite | CaCO3 |
| O | Oxygen | |
| O | β Calcite | CaCO3 |
| O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | β Quartz | SiO2 |
| O | β Scheelite | Ca(WO4) |
| O | β Garnet Group | X3Z2(SiO4)3 |
| Al | Aluminium | |
| Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | β Quartz | SiO2 |
| Si | β Garnet Group | X3Z2(SiO4)3 |
| S | Sulfur | |
| S | β Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | β Calcite | CaCO3 |
| Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | β Scheelite | Ca(WO4) |
| Fe | Iron | |
| Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | β Pyrite | FeS2 |
| W | Tungsten | |
| W | β Scheelite | Ca(WO4) |
Other Databases
| Link to USGS MRDS: | 10030131 |
|---|
Other Regions, Features and Areas containing this locality
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060170640
