Newman Estacia property, Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Newman Estacia property | Mine |
| Cedar Mountain | Mountain |
| Cedar Mountain Mining District | Mining District |
| Alameda County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 34' 5'' North , 121° 38' 20'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 17.0km |
| Sunol | 913 (2011) | 22.2km |
| Pleasanton | 79,510 (2017) | 23.3km |
| Mountain House | 9,675 (2011) | 25.4km |
| East Foothills | 8,269 (2011) | 26.1km |
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 | 34km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 40km |
| East Bay Mineral and Lapidary Club | Hayward, California | 41km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 47km |
A former Mn-silica occurrence/mine located in the W½SW¼ sec. 22 and/or in the SW¼NW¼SW¼ sec. 26, T4S, R3E, MDM, 3.1 km (1.9 miles) WNW of Cedar Mountain (coordinates of record), N of Lang Canyon, on private land (fee ownership). Discovered and first produced in 1880. Owned by Mabel Newman (1950). Owned by V.A. Prindle, Oakland, California (100%) (1975). MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in Franciscan Complex chert & Late Cretaceous shale. The ore body strikes N55W and dips 72S at a thickness of 1 meter, depth-to-top of 5 meters, a width of 4 meters, and a length of 24 meters. Orebody No. 1 is sedimentary. Mn ore and heavy staining in bedded cherts. The ore is mostly siliceous but small pockets of manganese oxides, with or without numerous veins of quartz are found. A large body has been worked since 1880, from time to time. The main body is a massive, siliceous bed enclosed in, and conformable to, well-bedded green radiolarian chert and shales. The dip varies from 10 to 30SW. The thickness of the ore bed varies from 2 to 3 feet, with an average of 2.5 feet. It contains small pockets of ore of good quality but for the most part it is siliceous. About 230 feet NW of the main working is a small pit that exposes oxide ore in chert that might be prospected. Bog manganese is associated with a spring in the area. The primary mode of origin was sedimentation and the secondary mode was oxidation. Primary ore control was bedding. There is no wallrock alteration. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).
Workings include surface openings comprised of a large open cut and small pits.
Production was 350 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:
| ⓘ 'Manganese Oxides' |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Quartz Formula: SiO2 |
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 | |||
| ⓘ | 'Psilomelane' | - | |
| ⓘ | 'Manganese Oxides' | - | |
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: | 10109084 |
|---|---|
| Link to USGS MRDS: | 10284354 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
USA
- California
- Diablo RangeMountain Range
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