Boiler Pit Mine (Victory Chrome Company deposit; Sugar Pine Chrome Mines), Hughes Mill, Forest Hill Divide area, Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Boiler Pit Mine (Victory Chrome Company deposit; Sugar Pine Chrome Mines) | Mine |
| Hughes Mill | - not defined - |
| Forest Hill Divide area | Area |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 6' 39'' North , 120° 45' 54'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Foresthill | 1,483 (2011) | 11.1km |
| Alta | 610 (2011) | 11.4km |
| Dutch Flat | 160 (2011) | 12.3km |
| Colfax | 2,005 (2017) | 16.3km |
| Georgetown | 2,367 (2011) | 23.5km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 28km |
| El Dorado County Mineral and Gem Society | Placerville, California | 42km |
| Gold Country Treasure Seekers | Placerville, California | 42km |
A former Cr-Fe occurrence/mine located in sec. 29, T15N, R11E, MDM, about 2.8 km NNE of Hughes Mill, S of Pagge Creek, on the E side of Brimstone Road, W of Sugar Pine Road, on private land within a National Forest land (state lease ??). Discovered and first produced in 1916. Owned by the federal government. Operated by the Victory Chrome Company (last operator) (1941). MRDS database stated accuracy for this location is 10 meters. This mine is located in a shallow, NW-trending gully.
This is one of many Cr deposits/mines placed into a very large area termed the "Forest Hill Divide area" by Rynearson. That area is based on geological and topographic considerations versus mining districts and overlaps several defined districts. Those Cr occurrences within mining districts are listed under their respective districts, the remainder are listed under Rynearson’s "Forest Hill Divide area."
Mineralization is hosted in serpentinite. The ore body strikes E00W and dips 30S at a thickness of 12 meters, width of 2 meters and a length of 15 meters. Ore body No. 1 is irregular; No. 2 is lenticular; and, No. 3 is tabular. The primary mode of origin was magmatic differentiation. Primary ore control was lithology. Wallrock alteration is intense (carbonitization). This deposit is located in the northern half of a NNW-trending belt of peridotite exposed over an area approximately 2 miles by 5 miles and is bordered by Paleozoic metamorphics and Tertiary volcanics. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include surface and underground openings. A partially filled trench and a few small dumps were all that was in evidence in 1975.
Production data are found in: Stinson, M.C. (1975).
Production was 1,000 plus tons, mostly during WWI.
Production statistics: Year: 1916: Cr ore (estimated) @ 45% Cr2O3.
Deposit was the largest deposit of the Pine Chrome Mine (WWI) and was worked by the Victory Chrome Company (WWII).
Reserves are not known.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: Fe2+Cr3+2O4 |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite ? | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnesiochromite | 4.BB.05 | MgCr2O4 |
| Unclassified | |||
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnesiochromite | MgCr2O4 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Fayalite-Forsterite Series | |
Other Databases
| Link to USGS MRDS: | 10043712 |
|---|
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 #0060610665
