Davenport and Smith property (Alma claim), Eylar Mountain, Black Wonder Mining District, Santa Clara County, California, USAi
Regional Level Types | |
---|---|
Davenport and Smith property (Alma claim) | Property |
Eylar Mountain | Mountain |
Black Wonder Mining District | Mining District |
Santa Clara County | County |
California | State |
USA | Country |
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Latitude & Longitude (WGS84):
37° 28' 22'' North , 121° 30' 57'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Diablo Grande | 826 (2017) | 22.5km |
East Foothills | 8,269 (2011) | 28.5km |
Westley | 603 (2011) | 29.2km |
Alum Rock | 15,536 (2018) | 29.9km |
Tracy | 87,075 (2017) | 30.7km |
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 | 32km |
Santa Clara Valley Gem & Mineral Society | San Jose, California | 37km |
Mother Lode Mineral Society | Modesto, California | 49km |
Mindat Locality ID:
92231
Long-form identifier:
mindat:1:2:92231:6
GUID (UUID V4):
ff804620-f836-4560-845f-5928d54aecf2
A Mn occurrence/prospect located in the NE¼ sec. 27, T5S, R4E, MDM, 3.6 km (2.3 miles) E of Eylar Mountain (coordinates of record), along the N canyon wall of Turner Gulch, just E of Arroyo Mocho, in the NE corner of the county. Discovered in 1917. Owned by Davenport and Smith, California (1974). MRDS database stated accuracy for this location is .
Mineralization is a Mn deposit (Mineral occurrence model information: Model code: 98; USGS model code: 24c.1; Deposit model name: Volcanogenic Mn, Franciscan), hosted in Franciscan shale. The ore body strikes N50W and dips 25 to 75 SW at a thickness of 1.83 meters. Controls for ore emplacement included sedimentary bedding. A massive bed of siliceous Mn oxide is broken by minor shearing so relations to country rock are unclear. Where undisturbed, it lies parallel to the bedding of the enclosing cherts and shales. The body averages 2½ feet thick to a maximum of 6 feet. Several thin ore beds are in the shale. Local alteration includes oxidation. Local rocks include rocks of the Franciscan melange.
Regional geologic structures include an ophiolitic melange.
Workings include unspecified surface and underground openings.
Analytical data results: 20 to 25% silica.
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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!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
ⓘ 'Manganese Oxides' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Unclassified | |||
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ⓘ | 'Manganese Oxides' | - |
List of minerals for each chemical element
Other Databases
Link to USGS MRDS: | 10033587 |
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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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