Evans prospect (Oak), Forest, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Evans prospect (Oak) | Prospect |
| Forest | - not defined - |
| Alleghany Mining District (Forest Mining District) | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 29' 12'' North , 120° 52' 45'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 9.2km |
| Pike | 134 (2011) | 11.5km |
| Camptonville | 158 (2011) | 15.0km |
| Washington | 185 (2011) | 15.7km |
| Sierra City | 221 (2011) | 22.8km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 34km |
An apparent Au-Cr occurrence/prospect located in sec. 29, T19N, R10E, MDM, 2.3 km (1.4 miles) WSW of Forest, along the W canyon wall of Lucky Dog Creek (E of the S workings of the Eureka Mine; 2 miles NW of Alleghany), on National Forest land. Owned by Robert Evans (1918- ). MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in gabbro and granite. The ore body strikes NW and dips NE. The vein may be continuous with the E branch of the Eureka vein. Many other small veins of irregular attitude occur but mainly with a N strike and W dip. The gabbro is cut by small granite dikes which strike generally N. In some of the smaller dikes are irregular vein-like, segregated deposits of quartz that also contain a little chalcedony. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings comprised of adits on both sides of the creek and a 20 foot deep shaft.
Production was 4 long tons of Cr ore.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Quartz | SiO2 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS MRDS: | 10043624 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060910241
