Crosby prospects, Lookout Point, Cedar Mountain Mining District, Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Crosby prospects | Group of Prospects |
| Lookout Point | Point |
| Cedar Mountain Mining District | Mining District |
| Alameda County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 33' 6'' North , 121° 41' 26'' West
Latitude & Longitude (decimal):
Type:
Group of Prospects
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 16.0km |
| Sunol | 913 (2011) | 18.1km |
| Pleasanton | 79,510 (2017) | 20.4km |
| East Foothills | 8,269 (2011) | 22.0km |
| Milpitas | 77,604 (2017) | 23.5km |
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 | 16km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 30km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 37km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 42km |
| Sequoia Gem and Mineral Society | Redwood City, California | 49km |
Mindat Locality ID:
73363
Long-form identifier:
mindat:1:2:73363:3
GUID (UUID V4):
a2bc8538-135c-4217-ab50-29624fadf7bd
A Mn occurrence located in the SE¼SW¼ sec. 30, T4S, R3E, MDM, 4.7 km (2.9 miles) NNW of Lookout Point (summit) (coordinates of record), on the W slope of Arroyo del Valle, on the eastern slope of Rocky Ridge, 12 miles from Livermore, and 5.7 km (3.5 miles) SW of Mendenhall Springs. Discovered in 1917. Owned by Mary Gerow (1950). Owned by William Crosby, California (1974). MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is hosted in Late Cretaceous chert. The ore body strikes N30-60E and dips 30S, 40NW. At the northern, and better of the two prospects, a large block containing about 50 tons of siliceous ore is exposed on the surface. It is underlain by well-bedded cherts and shales, striking N60E and dipping 30S. The other prospect is 500 feet SW where a trench exposes a 3 foot bed of massive chert cut be a few veinlets of manganese oxides. Local rocks include rocks of the Franciscan melange.
Workings include surface openings comprised of trenching.
No production recorded.
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
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
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: | 10027976 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Franciscan DomainDomain
- Sonoma-Livermore BasinBasin
USA
- California
- Diablo RangeMountain Range
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References
