Dean Mine, Mountain Top, French Creek Mining District, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Dean Mine | Mine |
| Mountain Top | Mountain |
| French Creek Mining District | Mining District |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 57' 6'' North , 120° 33' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 8.6km |
| Tuttletown | 668 (2011) | 9.2km |
| Jamestown | 3,433 (2011) | 11.3km |
| Angels Camp | 2,677 (2012) | 13.0km |
| Chinese Camp | 126 (2011) | 13.7km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 13km |
A former Cr mine located in the NW¼NW¼ sec. 9, T1N, R13E, MDM, 2.3 km (1.4 miles) ESE of Mountain Top (coordinates of record), along an unnamed tributary of Bean Gulch (1,100 feet NW of the Mayflower Mine, about half way up the NW slope from the bottom of Bean Gulch). Operated during WWI. No work done since that time. MRDS database stated accuracy for this location is 100 meters.
The deposit consists of a few small pods of massive chromite in gray serpentine. The ore is black, nearly pure, medium-grained chromite containing minor amounts of kammererite. Numerous small veins of magnesite and opal cut the surrounding serpentine. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include underground openings comprised of 3 small open cuts and a drift.
production information: About 10 tons containing 45% Cr2O3.
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 |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ Magnesite Formula: MgCO3 |
| ⓘ Opal Formula: SiO2 · nH2O |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
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 |
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Magnesite | 5.AB.05 | MgCO3 |
| Group 9 - Silicates | |||
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10109076 |
|---|
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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