Shelley Mine (Wolf Mine; Shelly Mine; Shelley Wolf Mine), Coloma, Coloma Mining District, West Belt, El Dorado County, California, USAi
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Latitude & Longitude (WGS84):
38° 50' 2'' North , 120° 52' 45'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coloma | 529 (2011) | 3.9km |
| Georgetown | 2,367 (2011) | 8.8km |
| Cold Springs | 446 (2011) | 10.3km |
| Auburn Lake Trails | 3,426 (2011) | 11.0km |
| Cool | 4,100 (2017) | 13.1km |
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 | 14km |
| Gold Country Treasure Seekers | Placerville, California | 14km |
| Roseville Rock Rollers | Roseville, California | 37km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 46km |
| Fossils for Fun Society, Inc. | North Highlands, California | 46km |
A former Cr-Fe occurrence/mine located in the SW¼NE¼ sec. 5, T11N, R10E, MDM, about 4.6 km (2½ miles) NNE of Coloma (2.9 km (9,500 feet) SW of Garden Valley; ¼ mile N of the Simon Mine), on private land (fee ownership). Discovered in 1917. Owned by David and Cynthia Cole (100%), California (1976); and C. Cupertino. Operated by Union Chrome Company during WWI, last operator (1918), California. Idle since 1918. MRDS database stated accuracy for this location is 100 meters.
Mineralization is hosted in harzburgite, dunite, and serpentinite. The ore body strikes N00S and dips 70W at a thickness of 14 meters, wifdth of 2 meters, and a length of 52 meters. Ore body No. 1 is tabular, disseminated. Ore body No. 2 is other, irregular. The primary mode of origin was magmatic differentiation. The secondary control was faulting. Wallrock alteration is intense (carbonitization & silicification). This mine is located on the eastern edge of an irregularly shaped ultramafic mass with 2 N-S-trending arms, each ¼ to ½ mile thick, that join towards the S, giving the mass a synclinal appearance. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Local structures include a shear zone which cuts across the ultramafic body, striking N-S and dipping 70W.
Workings include surface and underground openings comprised of a large 30 foot deep pit, a 15 foot shaft and several prospect pits, and a drift.
Production data are found in: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951), Chromite deposits of El Dorado County, California: California Division Mines Bulletin 134, part III, Chapter 4: 158.
First produced in 1917.
Past production was 1,284 tons of ore at a grade of 30% Cr2O3, all during the period 1917-1918. No reserve estimate.
Reserve-Resource:: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ Clinochlore var. Chromium-bearing Clinochlore Formula: Mg5(Al,Cr)2Si3O10(OH)8 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite ? | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnesiochromite | 4.BB.05 | MgCr2O4 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10029954 |
|---|
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 #0060170025
