Coal pit, Bunker Mine (Bunker Mines; Blue Bird Mine [1880's]; Bay Tree prospect; Sunnyside occurrence), Sage Hill, Michigan Bluff Mining District (Michigan Bluff Mining deposit), Placer County, California, USAi
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Latitude & Longitude (WGS84):
39° 2' 17'' North , 120° 46' 16'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Foresthill | 1,483 (2011) | 4.5km |
| Georgetown | 2,367 (2011) | 15.7km |
| Colfax | 2,005 (2017) | 17.2km |
| Alta | 610 (2011) | 19.0km |
| Dutch Flat | 160 (2011) | 19.5km |
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 | 32km |
| El Dorado County Mineral and Gem Society | Placerville, California | 34km |
| Gold Country Treasure Seekers | Placerville, California | 34km |
A former Cr occurrence/mine located in sec. 20, T14N, R11E, MDM, 1.5 km (0.9 mile) WNW of Sage Hill (coordinates of record), on the E ridge of Volcano Canyon. Operated by L.G. Embree (1943). MRDS database stated accuracy for this location is 100 meters.
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 is lenticular and pitches 70SE in a shear zone striking N60W. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include surface and underground openings comprised of open cuts, pits, and 2 shafts.
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: | 10077038 |
|---|
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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