Brandon Mine [4], Brandon Corner, Shingle Springs Mining District, West Belt, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| Brandon Mine [4] | Mine |
| Brandon Corner | Unincorporated Community |
| Shingle Springs Mining District | Mining District |
| West Belt | - not defined - |
| El Dorado County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 33' 57'' North , 120° 56' 3'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Shingle Springs | 4,432 (2011) | 11.1km |
| Plymouth | 960 (2017) | 12.2km |
| Cameron Park | 18,228 (2011) | 12.3km |
| Drytown | 167 (2011) | 15.5km |
| Rancho Murieta | 5,488 (2011) | 15.7km |
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 | 22km |
| Gold Country Treasure Seekers | Placerville, California | 22km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 22km |
| Roseville Rock Rollers | Roseville, California | 37km |
| Fossils for Fun Society, Inc. | North Highlands, California | 40km |
A former Cr-PGE (Pt-Pd-Ir-Rh-Ru) mine located in sec. 12, T8N, R9E, MDM, 2.2 km (1.4 miles) S of Brandon Corner and about 3 miles E of Latrobe, on the ridge between Slug Gulch and Little Indian Creek, on private land. No mine is shown on topo map; location given is for the PGE sample site location. Opened and closed in 1918. Operated by Mr. Robert D. Domecq, et al, and by the Brandon Brothers during WWI. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a Late Jurassic podiform chromite deposit (Deposit Model: 15: Podiform chromite [minor]), hosted in dunite (ultramafic rocks are serpentinized). The ore body is podiform with a width of 1.22 meters and a length of 3.05 meters. Ore control was magmatic segregation. Associated rocks include Late Jurassic Bear Mountain Ophiolite (peridotite). Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Local geologic structures include shearing. The contact of chromite pods and dunite is sheared.
Tectonic Structures include the Sierra Foothills Accreted Terrane.
Workings include surface openings comprised of 3 open cuts, 10 to 25 feet long.
Production was 4 carloads of ore produced in 1918. This mine has been idle since then and the workings are caved. A small amount of chromite remains in the deepest pit.
Analytical data results: 1 PGE analysis: Pt = 130 Parts per billion (PPB); Pd = 186 PPB; Ir = 200 PPB; Ru = 230 PPB; and Rh = 7 PPB.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
| ⓘ Clinochlore var. Chromium-bearing Clinochlore Formula: Mg5(Al,Cr)2Si3O10(OH)8 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| Group 9 - Silicates | |||
| ⓘ | Clinochlore | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 |
| ⓘ | var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| H | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| O | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| Mg | Magnesium | |
| Mg | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Mg | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| Al | Aluminium | |
| Al | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Al | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| Si | Silicon | |
| Si | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| Si | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS MRDS: | 10029666 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060170055
