Kelly Mine, Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Kelly 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° 37' 0'' North , 121° 40' 13'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 11.2km |
| Pleasanton | 79,510 (2017) | 18.7km |
| Sunol | 913 (2011) | 19.4km |
| Mountain House | 9,675 (2011) | 21.6km |
| Dublin | 57,721 (2017) | 25.2km |
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 | 11km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 37km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 37km |
| East Bay Mineral and Lapidary Club | Hayward, California | 37km |
| Antioch Lapidary Club | Antioch, California | 45km |
A Mn occurrence located in the E¼NW¼ sec. 5, T4S, R3E, MDM, 3.9 km (2.4 miles) NW of Mendenhall Springs, W of Crane Ridge and E of Arroyo Mocho, on private land (private lease). Discovered in 1917. Owned by John M. Kelly and May K. Devany (1950). Owned by Mrs. Kelly, California (1974). Operated by Holbrook and McGuire (1974). MRDS database stated accuracy for this location is 1,000 meters.
The ore body is 2.13 meters thick. Two ore bodies of massive siliceous ore lie parallel to the bedding of the enclosing green chert and shale. The strike is N65W and are nearly vertical on a high angle to the N. Psilomelane is the principal metalliferous constituent of the ore but near the surface a small quantity of Mn dioxide (pyrolusite) is present. The northern ore body is 5 to 7 feet thick and the southern body, separated from the first by 6 feet of barren chert, is at least 3 feet thick. Ore minerals are oxides of manganese, carrying a variable quantity of white, granular silica in irregular patches. Most of the ore it too high in silica to be marketed without resort to some process of concentration. Local rocks include rocks of the Franciscan melange.
Workings include surface and underground openings comprised of a 25 foot shaft plus surface 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
1 valid mineral.
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:
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10095036 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
- Sonoma-Livermore BasinBasin
USA
- California
- Diablo RangeMountain Range
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