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Clary & Langford Mine (Porter and Springs Mine; Nassau), Carmen City, Foothill Copper Belt, Calaveras Co., California, USAi
Regional Level Types
Clary & Langford Mine (Porter and Springs Mine; Nassau)Mine
Carmen CityCity
Foothill Copper BeltBelt
Calaveras Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
38° 2' 30'' North , 120° 38' 48'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copperopolis3,671 (2011)6.8km
Angels Camp2,677 (2012)9.8km
Vallecito442 (2011)16.1km
Tuttletown668 (2011)17.3km
San Andreas2,783 (2011)17.4km


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 Dana Chemical Elements

Mineral List


2 valid minerals.

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
Reference: Clark, William B. & Lydon, Philip A. (1963), Mines and Mineral Resources of Calaveras County, California, California Division of Mines and Geology, County Report No. 2: Page 128.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109153.
Clinochlore var. Chromium-bearing Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109153.
Clinochlore var. Pennine
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10163140.
'Fayalite-Forsterite Series'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10163140.
'Pyroxene Group'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10163140.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Clark, William B. & Lydon, Philip A. (1963), Mines and Mineral Resources of Calaveras County, California, California Division of Mines and Geology, County Report No. 2: Page 128.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Group 9 - Silicates
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var. Chromium-bearing Clinochlore9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
var. Pennine9.EC.55Mg5Al(AlSi3O10)(OH)8
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Unclassified Minerals, Mixtures, etc.
var. Chromium-bearing Clinochlore-Mg5(Al,Cr)2Si3O10(OH)8
var. Pennine-Mg5Al(AlSi3O10)(OH)8
'Fayalite-Forsterite Series'-
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
H Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
H ClinochloreMg5Al(AlSi3O10)(OH)8
OOxygen
O ChromiteFe2+Cr23+O4
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
O Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
O ClinochloreMg5Al(AlSi3O10)(OH)8
MgMagnesium
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Mg Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Al Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
Si Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
Si ClinochloreMg5Al(AlSi3O10)(OH)8
CrChromium
Cr ChromiteFe2+Cr23+O4
Cr Clinochlore var. Chromium-bearing ClinochloreMg5(Al,Cr)2Si3O10(OH)8
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe ChromiteFe2+Cr23+O4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bradley, W.W., Huguenin, Emile, Logan, C.A., Tucker, W.B., and Waring, C.A. (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76, 248 pp.: 121.
Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part 3, chapter 2: 47, Pl. 5.
Clark, William B. & Lydon, Philip A. (1962), Mines and Mineral Resources of Calaveras County, California, California Division of Mines and Geology, County Report No. 2: 128, Pl. D.
Stinson, M.C. (1975), Mineral Property Report, California Division of Mines and Geology (unpublished report).
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109153 & 10163140.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #006000402.
Taliaferro, Nicholas Lloyd, Coop War Minerals Investigations California Chrome, Calaveras County, No. 4.

Other Databases

Link to USGS MRDS:10109153

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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