Clary & Langford Mine (Porter and Springs Mine; Nassau), Carmen City, Foothill Copper Belt, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Clary & Langford Mine (Porter and Springs Mine; Nassau) | Mine |
| Carmen City | Unincorporated Community |
| Foothill Copper Belt | Belt |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 2' 30'' North , 120° 38' 48'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 6.8km |
| Angels Camp | 2,677 (2012) | 9.8km |
| Vallecito | 442 (2011) | 16.1km |
| Tuttletown | 668 (2011) | 17.3km |
| San Andreas | 2,783 (2011) | 17.4km |
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 | 10km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 41km |
A former Cr-Fe mine located in sec. 9 & in the NW¼ sec. 10, T2N, R12E, MDM, 3.9 km (2.4 miles) E of Carmen City and 5 miles N of Copperopolis (about 150 feet E of the Copperopolis-Angels Camp Road at a point about 0.6 mile N of Milton Road junction, on private land. Discovered and first operated in 1900. Owned by C. J. Tiscornia Ranches, Inc., San Andreas, California 95429. Operated by J. E. Porter, J. H. Spring (1918). Active prior to World War I until 1918. MRDS database stated accuracy for this location is 10 meters.
Mineralization is a lens of massive chromite in serpentine. The ore body strikes N40W and dips 90N at a thickness of 1 meter, width of 15 meters and a length of 20 meters, over an area of 1 HA. It is tabular, disseminated. A second ore body is irregular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). The ore is highly sheared serpentine. No ore can be seen in place but a few fragments of medium- to coarse-grained, massive chromite containing minor quantities of kammererite are scattered about the dumps. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include surface and underground openings. Developed by two 50 foot deep shafts as well as an open cut (all now flooded). A shaft and a few open cuts were reported in a small, detached mass of serpentine ½ mile to the W (NE¼ sec. 9).
Production information: A total of 348 long tons of ore were mined. Reserves probably negligible. Some of the ore mined was used by a local copper smelter as furnace linings.
Analytical data results: The ore contained 45-46% Cr2O3.
Analysis by the California Division of Mines and Geology in 1976 gave the following percentages: Cr2O3: 46.60; FeO: 8.31; total Fe: 12.87; Al2O3: 12.99; MgO; Cr:Fe = 3.19:1.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ Clinochlore var. Chromium-bearing Clinochlore Formula: Mg5(Al,Cr)2Si3O10(OH)8 |
| ⓘ Clinochlore var. Pennine Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ '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 |
| Group 9 - Silicates | |||
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
| ⓘ | var. Pennine | 9.EC.55 | Mg5Al(AlSi3O10)(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: | 10109153 |
|---|
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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