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Liberty Mine (McFall Mine), Mountain Top, French Creek Mining District, Calaveras Co., California, USAi
Regional Level Types
Liberty Mine (McFall Mine)Mine
Mountain TopMountain
French Creek Mining DistrictMining District
Calaveras Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
37° 57' 22'' North , 120° 33' 11'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copperopolis3,671 (2011)8.3km
Tuttletown668 (2011)9.1km
Jamestown3,433 (2011)11.4km
Angels Camp2,677 (2012)12.5km
Chinese Camp126 (2011)14.1km


A Cr mine located in the SW¼NW¼ sec. 9, T1N, R13E (MDM), 2.0 km (1.2 miles) ESE of Mountain Top (coordinates of record), along Bean Gulch (on a NE slope about 30 feet above the bottom of Bean Gulch). Discovered and first operated in 1917. Owned by California Chrome Co. (last operator) (1918). Now owned by the federal government (U.S. Bureau Of Land Management, Sacramento Office, California, administered) (1976). MRDS database stated accuracy for this location is 10 meters. Pemberton erroneously places this mine in the Melones Distict-

The deposit consists of a number of small pods of massive and nearly massive chromite striking NW and dipping NE. The enclosing serpentine is highly sheared and contains considerable amounts of slip-fiber asbestos. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface and underground openings. The underground workings have a length of 59 meters and are comprised of an inclined shaft 40 feet deep. Visible workings consist of a pit 15 to 20 feet deep, 25 feet long, and 4 to 10 feet wide. Workings caved at portal.

Production information: 282 tons of ore averaging 47% to 48% Cr2O3 were produced from 1917 to 1918.

No reserve estimate reported.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


2 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

'Asbestos'
Description: Considerabl;e slip-fiber material present.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10187534.
Chromite
Formula: Fe2+Cr3+2O4
Reference: USGS MRDS database (2005).
'Fayalite-Forsterite Series'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10187534.
Magnesiochromite
Formula: MgCr2O4
Reference: Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 41 & Pl. 5; Pemberton, H. Earl (1983), Minerals of California: 155 (map 4-6).
'Pyroxene Group'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10187534.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10187534.
Uvarovite
Formula: Ca3Cr2(SiO4)3
Reference: Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 45; Pemberton, H. Earl (1983), Minerals of California: 494.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Chromite ?4.BB.05Fe2+Cr3+2O4
Magnesiochromite4.BB.05MgCr2O4
Group 9 - Silicates
Uvarovite9.AD.25Ca3Cr2(SiO4)3
Unclassified Minerals, Rocks, etc.
'Asbestos'-
'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
Chromite ?7.2.3.3Fe2+Cr3+2O4
Magnesiochromite7.2.3.1MgCr2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Uvarovite51.4.3b.3Ca3Cr2(SiO4)3
Unclassified Minerals, Mixtures, etc.
'Asbestos'-
'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
OOxygen
O MagnesiochromiteMgCr2O4
O UvaroviteCa3Cr2(SiO4)3
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O ChromiteFe2+Cr23+O4
MgMagnesium
Mg MagnesiochromiteMgCr2O4
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si UvaroviteCa3Cr2(SiO4)3
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CaCalcium
Ca UvaroviteCa3Cr2(SiO4)3
CrChromium
Cr MagnesiochromiteMgCr2O4
Cr UvaroviteCa3Cr2(SiO4)3
Cr ChromiteFe2+Cr23+O4
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe ChromiteFe2+Cr23+O4
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.: 112.
Cater, F.W., Jr. (1948b), Chromite deposits of Calaveras and Amador Counties, California: California Division Mines Bulletin 134, part III, Chapter 2: 41 & Pl. 5, 45.
Taliaferro, N. L., and Solari, A. J. (1949), Geology of the Copperopolis quadrangle, California: California Division of Mines Bulletin 145: Pl.2.
Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2: 129, Pl. D.
Pemberton, H. Earl (1983), Minerals of California: 155 (map 4-6), 494.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027953 & 10187534.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090561.
Taliaferro, Nicholas Lloyd, Coop War Minerals Investigations California Chrome, Calaveras County, No. 3 (unpublished).
Map GP-561.

Other Databases

USGS MRDS Record:10027953

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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