Fiddler's Green deposit (Farmer property), Todd Valley, Forest Hill Mining District, Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Fiddler's Green deposit (Farmer property) | Deposit |
| Todd Valley | Valley |
| Forest Hill Mining District | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
38° 57' 43'' North , 120° 55' 6'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Auburn Lake Trails | 3,426 (2011) | 6.1km |
| Georgetown | 2,367 (2011) | 9.2km |
| Meadow Vista | 3,217 (2011) | 9.9km |
| Foresthill | 1,483 (2011) | 10.8km |
| Cool | 4,100 (2017) | 11.8km |
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 |
|---|---|---|
| El Dorado County Mineral and Gem Society | Placerville, California | 28km |
| Gold Country Treasure Seekers | Placerville, California | 28km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 31km |
| Roseville Rock Rollers | Roseville, California | 40km |
| Fossils for Fun Society, Inc. | North Highlands, California | 50km |
A Cr-Fe occurrence located in sec. 24, T13N, R9E, MDM, about 7.6 km SW of Todd Valley, on the N canyon wall of the Middle Fork American River, E of Paradise Canyon/Todd Creek. Discovered in and first produced in 1917. Owned by R. H. Farmer and J. G. Dodds, California (1918). Operated by Guy Walsh and Hall, lessees, California (1917). MRDS database stated accuracy for this location is 100 meters. Waring (1917) reported the deposit to be in sec. 29, but Rynearson believed it to be an error, and the deposit is actually in sec. 24.
The ore body is podiform and strikes N75E. Ore body No. 1 is disseminated, massive. Ore body No. 2 is a shear zone. The primary mode of origin was magmatic differentiation and the primary ore control was lithology. Wallrock alteration is intense (carbonitization). Workings opened a series od small "bunches" of ore striking N80E, along the contact between serpentine and amphibolite schist. Another deposit, 50 feet lower in altitude from the original deposit, exposed a stringer of low-grade ore striking N60E and dipping 60SE. The ore was reported to be fine-grained and contained magnetite. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include surface and underground openings. The original discovery was opened by 4 open cuts about 10 feet long, 4 feet deep and included a 12 foot shaft. The other deposit was opened by a shallow open cut about 30 feet long.
About 9 tons of ore was on the dumps in 1917.
Analytical data results: The ore assayed at 32.3% Cr2O3 and 13.0% SiO2.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| ⓘ 'Asbestos' |
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| Unclassified | |||
| ⓘ | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| ⓘ | 'Asbestos' | - | |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| F | Fluorine | |
| F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Mg | Magnesium | |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | Silicon | |
| Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Cl | Chlorine | |
| Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Ti | Titanium | |
| Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS MRDS: | 10032082 |
|---|
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
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060610227
