Freitas prospect (Vernon prospect), Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USAi
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Latitude & Longitude (WGS84):
37° 35' 50'' North , 121° 39' 43'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 13.2km |
| Sunol | 913 (2011) | 19.9km |
| Pleasanton | 79,510 (2017) | 20.0km |
| Mountain House | 9,675 (2011) | 23.2km |
| Tracy | 87,075 (2017) | 26.1km |
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 |
|---|---|---|
| Livermore Valley Lithophiles | Livermore, California | 13km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 35km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 38km |
| East Bay Mineral and Lapidary Club | Hayward, California | 39km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 46km |
A Mn occurrence/prospect located in the NE¼SE¼ sec. 8, T4S, R3E, MDM, 1.8 km (1.1 miles; 5,900 feet) NW of Mendenhall Springs, along the eastern slope of Cedar Mountain Ridge, W of Arroyo Mocho. Discovered in 1918. Owned by Mr. William Freitas (1974). MRDS database stated accuracy for this location is 1,000 meters.
A massive bed of Mn-bearing material, comprised of maroon chert, finely porous pink silica, and stains and fracture fillings of Mn oxides, is exposed in the workings. The relation of this body to the adjacent rock is uncertain but it appears to be overlain to the S by greenstone. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).
Workings include surface openings comprised of a small open cut.
Ten tons of material has been mined and stacked (1918). No production was recorded. No shipping ore could be recovered by hand sorting.
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
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Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Manganese Oxides' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Unclassified | |||
|---|---|---|---|
| ⓘ | 'Manganese Oxides' | - | |
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10027986 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
USA
- California
- Diablo RangeMountain Range
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