Antioch Mine, Somersville, Contra Costa County, California, USAi
| Regional Level Types | |
|---|---|
| Antioch Mine | Mine |
| Somersville | Town (Historical) |
| Contra Costa County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 57' 16'' North , 121° 51' 57'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Clayton | 11,867 (2017) | 6.3km |
| Antioch | 110,542 (2017) | 7.7km |
| Pittsburg | 69,424 (2017) | 8.3km |
| Bay Point | 21,534 (2014) | 11.8km |
| North Gate | 679 (2017) | 12.8km |
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 |
|---|---|---|
| Antioch Lapidary Club | Antioch, California | 8km |
| Contra Costa Mineral & Gem Society | Concord, California | 15km |
| Northern California Geological Society | Orinda, California | 29km |
| Livermore Valley Lithophiles | Livermore, California | 32km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 37km |
Mindat Locality ID:
76614
Long-form identifier:
mindat:1:2:76614:5
GUID (UUID V4):
fa9477aa-657e-42cf-9356-b09c0853d5ae
A former silica deposit/mine/pit located in the S½SW¼SE¼ sec. 4, N½NE¼ sec. 9 and in the N½NW¼ sec. 10, T1N, R1E, MDM, 0.3 km (0.2 mile) SW of Somerville (site), on the Black Diamond Mines Regional Preserve. MRDS database stated accuracy for this location is 100 meters.
Friable, white, impure silica sandstone beds strike N70-80W and dip 20-35N. Local rocks include Eocene marine rocks.
Workings include surface openings.
Production data: 326,000 tons of sandstone mined by room and pillar method.
Channel samples analyzed 85.8-89.6% SiO2, 4.4-6.9% Al2O3, and 1.26-1.92% Fe2O3.
About 8,000,000 tons available based on 60-70% extraction. 838,000 tons available to open-pit mining in a bed averaging 36 feet thick with about 20 feet of overburden.
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
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Rock Types Recorded
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Alphabetical List Tree DiagramGallery:
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Other Databases
| Link to USGS MRDS: | 10109196 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Franciscan DomainDomain
- Great Valley BasinBasin
- Sonoma-Livermore BasinBasin
USA
- California
- Diablo RangeMountain Range
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References
