Half Chrome Mine (Limekin Mine; Wolf Mine), Dew Drop, Nevada County, California, USAi
| Regional Level Types | |
|---|---|
| Half Chrome Mine (Limekin Mine; Wolf Mine) | Mine |
| Dew Drop | - not defined - |
| Nevada County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 5' 21'' North , 121° 5' 54'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Lake of the Pines | 3,917 (2011) | 6.6km |
| Alta Sierra | 6,911 (2011) | 7.0km |
| Meadow Vista | 3,217 (2011) | 11.8km |
| Colfax | 2,005 (2017) | 12.6km |
| Penn Valley | 1,621 (2011) | 14.3km |
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 | 15km |
| Roseville Rock Rollers | Roseville, California | 41km |
| Sutter Buttes Gem & Mineral Society | Marysville, California | 43km |
| El Dorado County Mineral and Gem Society | Placerville, California | 48km |
| Gold Country Treasure Seekers | Placerville, California | 48km |
Mindat Locality ID:
84203
Long-form identifier:
mindat:1:2:84203:8
GUID (UUID V4):
0e184e14-4c59-40d0-b624-5908a1dbc385
A former Cr occurrence/mine located in the S½SW¼ sec. 4, T14N, R8E, MDM, 1.0 km (0.6 mile) WNW of Dew Drop, on state forest land (located claim). Owned by E. H. Thompson (reported owner during WWI), California (1976). Operated by Guy Walsh and Mr. Hall (1917-1918). MRDS database stated accuracy for this location is 500 meters.
The ore body is lenticular, disseminated, strikes N40W and dips 80N at a thickness of 30 meters, a width of 9 meters and a length of 24 meters. The primary mode of origin was magmatic differentiation. Primary ore control was lithology and the secondary control was fracturing. Wallrock alteration includes carbonitization. Some magnetite was reported present and some of the ore was said to be mixed with hematite. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
workings include surface openings comprised of a pit 4 feet wide, 8 to 10 feet long and 10 feet deep. Another pit was about 30 feet SE and was 3 feet wide, 6 feet long and 10 feet deep. There was also a prospect trench 2 to 3 feet wide.
E.H.Thompson and H.C.Schroeder shipped 49 long tons of ore in 1916. The ore contained about 35% Cr2O3. Walsh and Harted realized a production of 147 long tons in 1917. No work has been done since 1917.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
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 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS MRDS: | 10031685 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060570061
