Black Jack Mine, Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Black Jack Mine | Mine |
| Mendenhall Springs | Group of Springs |
| Livermore Mining District (Tesla District) | Mining District |
| Alameda County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 35' 33'' North , 121° 36' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 17.0km |
| Mountain House | 9,675 (2011) | 22.0km |
| Tracy | 87,075 (2017) | 23.1km |
| Sunol | 913 (2011) | 24.4km |
| Pleasanton | 79,510 (2017) | 24.5km |
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 | 17km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 38km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 42km |
| Antioch Lapidary Club | Antioch, California | 49km |
| Stockton Lapidary & Mineral Club | Stockton, California | 49km |
Mindat Locality ID:
73354
Long-form identifier:
mindat:1:2:73354:5
GUID (UUID V4):
259eb15f-f1e4-4c23-881a-4dcf87c88905
A former Mn-silica occurrence/mine located in the SW¼NE¼ sec. 14, T4S, R3E, MDM, 3.1 km (1.9 miles) E of Mendenhall Springs, on private land (fee ownership). Discovered in 1884. Owned by W. Holm and L.S. & L.J. Ione (100%), Livermore, California (1975). First produced in 1885. MRDS database stated accuracy for this location is 100 meters.
Mineralization is hosted in Late Cretaceous chert. The ore body strikes N25E to N20W and dips 25 to 55W at a thickness of 1 meter, depth-to-top of 2 meters, width of 5 meters and a length of 30 meters. Ore body No. 1 is sedimentary and tabular. Ore body No. 2 is in a shear zone and irregular. The primary mode of origin was sedimentation and the secondary mode of origin was oxidation. Primary ore control was bedding and the secondary control was fracturing. There is no wallrock alteration. The thickness varies from 1.7 to 4.0 feet and averages 2.5 feet. The deposit is in a bed of massive, grey chgert, with irregular pockets of siliceous oxide ore. The chert and the ore are cut by numerous veins of quartz. The ore body lies parallel to bedding of the enclosing radiolarin cherts and shales. Local rocks include rocks of the Franciscan melange.
Workings include underground openings comprised of a 60 foot drift to the ore body and continues 30 feet further, following the ore body along a course of N20W. There is an 8 foot raise. A second drift follows the ore body along a course N10W for 40 feet.
Past production was 40 tons.
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
2 valid minerals.
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:
| ⓘ 'Jasper' References: |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ 'Wad' References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Unclassified | |||
| ⓘ | 'Jasper' | - | |
| ⓘ | 'Psilomelane' | - | |
| ⓘ | 'Wad' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10109080 |
|---|
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
