Roggasch Brothers Quarry, Alum Rock, Black Wonder Mining District, Santa Clara County, California, USAi
| Regional Level Types | |
|---|---|
| Roggasch Brothers Quarry | Quarry |
| Alum Rock | - not defined - |
| Black Wonder Mining District | Mining District |
| Santa Clara County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 21' 22'' North , 121° 48' 5'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Alum Rock | 15,536 (2018) | 2.5km |
| East Foothills | 8,269 (2011) | 3.1km |
| San Jose | 1,026,908 (2017) | 8.5km |
| Seven Trees | 1,788 (2018) | 8.5km |
| Communications Hill | 11,267 (2019) | 8.8km |
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 |
|---|---|---|
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 8km |
| Peninsula Gem & Geology Society, Inc. | Los Altos, California | 28km |
| Livermore Valley Lithophiles | Livermore, California | 36km |
| Sequoia Gem and Mineral Society | Redwood City, California | 41km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 43km |
A stone deposit/quarry located in the center W½NW¼ sec. 6, T7S, R2E, MDM, 2.5 km (1.6 miles; 8,500 feet) ESE of Alum Rock center (town). MRDS database stated accuracy for this location is 100 meters.
NOTE: There is a second USGS MRDS database file (#10189940) with a separate MAS/MILS file number (#0060850131) with a different set of geographic coordinates (37.44431, -121.90043) and stated to be in sec. 6, but in a different township and range (T6S, R1E). The coordinates given place this locality in a topographically flat, residential area of the city of Milpitas. It can not be determined if this is the same locality or a different operation.
Local rocks include Quaternary alluvium and marine deposits.
Workings include unspecified surface openings.
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10286485 |
|---|
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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