Liberty Mine (McFall Mine), Mountain Top, French Creek Mining District, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Liberty Mine (McFall 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' 22'' North , 120° 33' 11'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 8.3km |
| Tuttletown | 668 (2011) | 9.1km |
| Jamestown | 3,433 (2011) | 11.4km |
| Angels Camp | 2,677 (2012) | 12.5km |
| Chinese Camp | 126 (2011) | 14.1km |
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 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 Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ 'Asbestos' Description: Considerabl;e slip-fiber material present. |
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Uvarovite Formula: Ca3Cr2(SiO4)3 |
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 |
| Group 9 - Silicates | |||
| ⓘ | Uvarovite | 9.AD.25 | Ca3Cr2(SiO4)3 |
| Unclassified | |||
| ⓘ | 'Asbestos' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnesiochromite | MgCr2O4 |
| O | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Ca | Calcium | |
| Ca | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Cr | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Fayalite-Forsterite Series | |
Other Databases
| Link to USGS MRDS: | 10027953 |
|---|
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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