Green deposit (Americus deposit; Farmer property), Todd Valley, Forest Hill Mining District, Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Green deposit (Americus deposit; Farmer property) | Deposit |
| Todd Valley | Valley |
| Forest Hill Mining District | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 59' 27'' North , 120° 55' 6'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Auburn Lake Trails | 3,426 (2011) | 9.0km |
| Meadow Vista | 3,217 (2011) | 9.0km |
| Foresthill | 1,483 (2011) | 9.3km |
| Georgetown | 2,367 (2011) | 11.6km |
| Colfax | 2,005 (2017) | 12.6km |
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 | 28km |
| El Dorado County Mineral and Gem Society | Placerville, California | 31km |
| Gold Country Treasure Seekers | Placerville, California | 31km |
| Roseville Rock Rollers | Roseville, California | 42km |
A former Cr occurrence/mine located in sec. 12, T13N, R9E, MDM, about 6.3 km WSW of Todd Valley, on the W canyon wall of Gas Canyon, SW of the Spring Garden School. Owned by R. H. Farmer & J. G. Dodds (1918). Operated by R. H. Farmer (1918). MRDS database accuracy for this location is not stated.
The ore body is lenticular in form. Ore occurred as a series of small lenses striking about N35W. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include underground openings comprised of 24 foot deep shaft with 12 feet of short drifts at bottom.
Production data are found in: Rynearson, Garn Arthur (1953): 201.
Production statistics: Year: 1920 (period = pre-1920); Cr ore (estimated at 21.1% Cr2O3.
Analytical data results: Ore: 21.1% Cr2O3; 12.0% SiO2.
No ore was exposed in the workings in 1917.
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: | 10032077 |
|---|
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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