Stanislaus River Chrome Mine, New Melones Dam, Tuolumne County, California, USAi
| Regional Level Types | |
|---|---|
| Stanislaus River Chrome Mine | Mine |
| New Melones Dam | Dam |
| Tuolumne County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 55' 51'' North , 120° 31' 31'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Tuttletown | 668 (2011) | 8.9km |
| Jamestown | 3,433 (2011) | 9.3km |
| Chinese Camp | 126 (2011) | 10.5km |
| Copperopolis | 3,671 (2011) | 11.6km |
| Sonora | 4,818 (2017) | 13.9km |
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 | 15km |
A former Cr mine located in the NE¼NE¼ sec. 22, T1N, R13E, MDM, 1.9 km (6,300 feet) E of the dam and 4.0 km (2.5 miles) NW of Peoria Flat, on private land. Discovered in 1915 by William Laughlin. Ownerd by William Laughlin. Operated by P. Mertz, S. Rosenthal, & H. Kiaupat (WW I). MRDS database accuracy for this location is not stated. The mine is approximately 100 feet above the Stanislaus River.
Mineralization is a Cr deposit hosted in Late Jurassic serpentinite. The ore body is lenticular. The deposit consists of 1 large, and several small lenses. The river geology of this deposit is more closely related to deposits lying across the river in Calaveras County than to those of Peoria Flat proper. The deposit occurs in the northern part of the westernmost of 2 serpentine belts which trend NW-SE across the county. The belt is exposed over an area 30 km by 6 km. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Local structures include significant shearing of the host rock.
Workings include surface and underground openings comprised of a 60 foot long open cut and a tunnel 40 feet long.
Production data are found in: Cater (1948), CDMG Bulletin 134, part 3, chapter 1: 30.
Analytical data results: The ore averagers 45 Cr2O3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
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 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnesiochromite | MgCr2O4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS MRDS: | 10111219 |
|---|
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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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0061090030
