Roye-Sum Mine, Mack House, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Roye-Sum Mine | Mine |
| Mack House | - 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° 27' 15'' North , 120° 51' 20'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Washington | 185 (2011) | 11.6km |
| Downieville | 282 (2011) | 11.9km |
| Pike | 134 (2011) | 12.3km |
| Camptonville | 158 (2011) | 16.6km |
| Sierra City | 221 (2011) | 22.7km |
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 | 32km |
A former lode Au occurrence/mine located in the SE¼ (estimated) sec. 4, T18N, R10E, MDM, 1.1 km (0.7 mile) E of Mack House, on Oak Flat, S of Kanaka Creek (2 miles SSW of Alleghany), on National Forest land. MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is a vein deposit hosted in schist & gabbro. The ore body strikes N40W and dips 50SW at a thickness of 0.91 meter. Quartz lenses occur along a shear zone that strikes N30-50W. The largest lenses are 100 feet wide and up to 3 feet thick. Sulfides follow parallel planes from shearing after the first vein filling. At one point veinlets of chalcedonic quartz carrying pyrite cut the older quartz. This suggests that an original definite vein has been sheared by post-mineralization movement into a series of discontinuous lenses. Local rocks include Mesozoic gabbroic rocks, unit 2 (undivided) and/or ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include underground openings comprised of a 2,300 foot adit along the shear zone.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | 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 | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10034810 |
|---|
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 #0060910135
