Rich Hill Mine, Grass Valley, Grass Valley Mining District, Nevada County, California, USAi
| Regional Level Types | |
|---|---|
| Rich Hill Mine | Mine |
| Grass Valley | Valley |
| Grass Valley Mining District | Mining District |
| Nevada County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 12' 18'' North , 121° 2' 38'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Grass Valley | 12,944 (2017) | 2.2km |
| Nevada City | 3,152 (2017) | 6.7km |
| Alta Sierra | 6,911 (2011) | 7.1km |
| Rough and Ready | 963 (2011) | 8.4km |
| Penn Valley | 1,621 (2011) | 12.7km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 2km |
| Sutter Buttes Gem & Mineral Society | Marysville, California | 48km |
A former lode Au-Pb-Zn-As occurrence/mine located in the N½S½ (estimated) sec. 35, T16N, R8E, MDM, about 4 km SE of Grass Valley proper, on the W slope of Ophir Hill, W of Union Hill. MRDS database accuracy for this location is not stated. Part of the Empire claim.
Mineralization is a vein deposit hosted in diabase and granodiorite. The ore body strikes NW and dips 35SW at a thickness of 0.3 meter. It is comprised of a vein and seams averaging 1 foot in thickness. Combed, massive and sheared quartz are present. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings with a length of 579.12 meters and an overall depth of 304.8 meters and comprised of stopes, crosscuts, drifts and a shaft.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10007495 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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