Three Queens Mine (Four Acres Mine), Foresthill, Forest Hill Mining District, Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Three Queens Mine (Four Acres Mine) | Mine |
| Foresthill | - not defined - |
| Forest Hill Mining District | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 0' 40'' North , 120° 47' 7'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Foresthill | 1,483 (2011) | 3.0km |
| Georgetown | 2,367 (2011) | 12.5km |
| Colfax | 2,005 (2017) | 17.6km |
| Auburn Lake Trails | 3,426 (2011) | 18.0km |
| Meadow Vista | 3,217 (2011) | 20.5km |
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 | 31km |
| Gold Country Treasure Seekers | Placerville, California | 31km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 33km |
A former lode Au-Pb occurrence/mine located in the NW¼SE¼ sec. 31, T14N, R11E, MDM, 3.0 km (9,900 feet) ESE of Foresthill, 1 mile N of the Middle Fork American River, on private land within a National Forest area. The property is comprised of 14 claims extending along a dike of serpentinite and schist contact. Operated in the late 1800's and sporadically into the 1930's. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a vein deposit hosted in serpentinite & schist. The ore body strikes NW and dips 40NE at a thickness 1.22 meters. The vein is 3 to 4 feet thick. The best ore was reported in a serpentine dike footwall where ankerite was "stamed' (stained ?) by mariposite. High-grade ore occurs along a quartz vein hanging wall, formed by repeated offsetting. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Local geologic structures include: faulting.
Workings include underground openings with a length of 131.06 meters and an overall depth of 80.77 meters and comprised of several adits, stopes, drifting and a winze.
Production data are found in: Logan, Clarence August (1936); McCulloch, W.C., Oesterling, W.A., Spurck, W.H., & Tischler, M.S. (1964).
Over $100,000 (period values) of Au was mined via several adits. No other production record was found.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| ⓘ Graphite Formula: C |
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Graphite | 1.CB.05a | C |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| C | ⓘ Graphite | C |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10086481 |
|---|
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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