Roupe property (Big Chance; Camptonville property; Big Chrome), Indian Hill, Indian Hill Mining District, Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Roupe property (Big Chance; Camptonville property; Big Chrome) | Property |
| Indian Hill | Hill |
| Indian Hill Mining District | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 28' 59'' North , 120° 59' 34'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Pike | 134 (2011) | 4.9km |
| Camptonville | 158 (2011) | 5.9km |
| Clipper Mills | 142 (2011) | 15.2km |
| North San Juan | 269 (2011) | 15.8km |
| Downieville | 282 (2011) | 16.6km |
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 | 30km |
| Feather River Lapidary & Mineral Society | Oroville, California | 49km |
A former Cr occurrence/mine located in sec. 30, T19N, R9E, MDM, 2.7 km (1.6 miles) S of Indian Hill, in the headwaters area of the W fork Grant Ravine, N of Henness Pass Road, on National Forest land. Owned/operated by R.J. & W.B. Roupe, Camptonville, California (1942- ). First production occurred in 1914 and the last in 1942. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a Cr deposit hosted in Late Cretaceous serpentinite. The ore bodies are lenticular, strike N36W and dip 80SW at a thickness of 1.52 meters, width of 3.05 meters and a length of 4.57 meters. Small lenses of massive ore occur in residual soil in underlying serpentine. The serpentine is highly sheared. Twenty or more ore bodies were found scattered for approximately 700 feet along an irregular zone with the above attitudes. Each ore body averages the above dimensions. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include surface and underground openings comprised of 22 small open cuts and 3 shallow shafts (1942).
Production data are found in: Rynearson, Garn Arthur (1953).
Production statistics: Year: 1917 (period = 1914-1917): Ore (accurate): ^42-43% Cr2O3 (43 weight percent).
Analytical data results: The ore averaged 42-44% Cr203.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS MRDS: | 10043630 |
|---|
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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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060910048
