Camp 9 deposit (Camp 9 Merchant; Cummings), Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USAi
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Latitude & Longitude (WGS84):
37° 36' 5'' North , 121° 39' 1'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 13.7km |
| Pleasanton | 79,510 (2017) | 20.9km |
| Sunol | 913 (2011) | 21.0km |
| Mountain House | 9,675 (2011) | 22.3km |
| Tracy | 87,075 (2017) | 25.0km |
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 | 14km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 36km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 39km |
| Antioch Lapidary Club | Antioch, California | 47km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 47km |
Mindat Locality ID:
73356
Long-form identifier:
mindat:1:2:73356:3
GUID (UUID V4):
c3ed8506-0f20-4d16-9b56-07714317bb6c
A former Mn occurrence/mine located in the SE¼NW¼ sec. 9, T4S, R3E, MDM, 1.5 km (1.0 mile; 5,000 feet) NNW of Mendenhall Springs, along the E canyon wall of Arroyo Mocho, on county owned land (fee ownership). Discovered in 1886. First production occurred in 1888. Operated by O.F. Devany, et al (100%) (lessees), California (1975). MRDS database stated accuracy for this location is 100 meters. The mine is situated on the W bank of a small, steep gulch that trends SW to the Arroyo Mocho. It was uncovered during construction of the road. Further prospecting is warranted at several points.
Mineralization is hosted in the Lower Unit, Spud Mountain Volcanics (chert). The ore body strikes N40W and dips 50S at a thickness of 1.5 meters, depth-to-top of 5 meters, width of 3 meters and a length of 55 meters. Ore body No. 1 is sedimentary and tabular. Ore body No. 2 is irregular. The primary mode of origin was sedimentation and the secondary mode was oxidation. Primary ore control was bedding. There is no wallrock alteration. The ore is hosted in rocks of the Franciscan complex. It is a single, massive bed; lower part of the zone (?). Invariably a massive chert grading to an upper zone of carbonate ore that occurs in lenses and kidneys. The upper contact of the ore zone is very continuous and is strongly stained by Mn oxides. The ore body lies within a body of bedded, radiolarian chert and shale and lies essentially parallel to them. Veinlets of blue amphibole were found in the massive chert at several places in the lower workings. Local rocks include rocks of the Franciscan melange.
Workings include underground openings comprised of 2 tunnels, one below the Arroyo Mocho Road, the other above it. The workings are, in places, connected by stopes along the ore zone.
Production was more than 1,000 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
3 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:
| ⓘ Glaucophane Formula: ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Group 9 - Silicates | |||
| ⓘ | Glaucophane | 9.DE.25 | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| C | Carbon | |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| Na | Sodium | |
| Na | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Si | Silicon | |
| Si | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Mn | ⓘ Rhodochrosite | MnCO3 |
Other Databases
| Link to USGS MRDS: | 10109078 |
|---|
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
