Cedar Mountain Magnesite Mine, Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Cedar Mountain Magnesite Mine | Mine |
| Cedar Mountain | Mountain |
| Cedar Mountain Mining District | Mining District |
| Alameda County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 33' 33'' North , 121° 37' 38'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 18.4km |
| Sunol | 913 (2011) | 23.3km |
| Pleasanton | 79,510 (2017) | 24.6km |
| East Foothills | 8,269 (2011) | 26.0km |
| Mountain House | 9,675 (2011) | 26.0km |
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 |
|---|---|---|
| Livermore Valley Lithophiles | Livermore, California | 18km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 34km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 42km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 47km |
Mindat Locality ID:
73357
Long-form identifier:
mindat:1:2:73357:2
GUID (UUID V4):
40a6c536-c20e-4e08-a698-179786fc7d49
Other/historical names associated with this locality:
Cedar Mountain Mine
A former magnesite mine located near the center NE¼ secs. 27 & in sec. 35, T4S, R3E, MDM, 1.9 km (1.2 miles; 6,300 feet) W of the Cedar Mountain summit, along the N canyon wall of Lang Canyon in its headwaters area. Holdings in 1925 were 160 acres. Owned by Hugh Walker (1950). The MRDS database accuracy for this locality is not stated.
Mineralization is a magnesite deposit. The rock is white, porcellaneous, massive to mammillary and the fracture is conchoidal. It occurs near the outer margin of a serpentine body on Cedar Mountain. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).
Workings include surface and underground openings comprised of a glory hole and cut, and tunnels. The largest pit is 30 feet in diameter and 30 feet deep.
Worked spasmodically for several years . No production was reported since 1917. In 1925 there was about a carload of ore on hand and ready to ship. The magnesite, as a rule, was of excellent quality.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Detailed Mineral List:
| ⓘ Magnesite Formula: MgCO3 Description: Occurs as stringers in serpentine. References: |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Magnesite | 5.AB.05 | MgCO3 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Magnesite | MgCO3 |
| O | Oxygen | |
| O | ⓘ Magnesite | MgCO3 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesite | MgCO3 |
| Si | Silicon | |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
Other Databases
| Link to USGS MRDS: | 10027975 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Franciscan DomainDomain
USA
- California
- Diablo RangeMountain Range
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References
