Mount Pleasant Mine (Mount Pleasant deposit), Grizzly Flat, Grizzly Flat Mining District, East Belt, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| Mount Pleasant Mine (Mount Pleasant deposit) | Mine |
| Grizzly Flat | Flat |
| Grizzly Flat Mining District | Mining District |
| East Belt | - not defined - |
| El Dorado County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 38' 15'' North , 120° 32' 25'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Pollock Pines | 6,871 (2017) | 14.4km |
| Camino | 1,750 (2011) | 16.2km |
| River Pines | 379 (2011) | 20.4km |
| Buckhorn | 2,429 (2017) | 20.6km |
| Volcano | 115 (2017) | 23.0km |
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 | 25km |
| Gold Country Treasure Seekers | Placerville, California | 25km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 35km |
Mindat Locality ID:
77960
Long-form identifier:
mindat:1:2:77960:8
GUID (UUID V4):
4284627e-ef46-485d-90b4-f52827b38b17
A former Au-Cu-Pb-Zn mine located in the NE¼ sec. 16, T9N, R13E, MDM, 1.2 km (0.8 mile) W of Grizzly Flat and 0.3 km (0.2 mile) SSW of the Morey (Humbug) Mine, E of String Canyon, on private land. Operated during the periods 1851 to 1874, 1874 to 1914 and 1939 to 1941. Proaspected after 1914. No records exist of activity prior to 1874. MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is hosted in granodiorite and mica schist. The deposit is a belt of nearly parallel veins in a contact zone. There are 3 main veins that strike 2 to 10E of the belt's strike. The principal vein for ore is the Earle vein (1 to 18 feet thick); others are the Mount Pleasant vein (6 to 18 feet), the McKane vein (1 to 14 feet), and the Charles vein (½ to 4 feet). Ore control included the contact zone. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include underground openings with a length of 3,048 meters and an overall depth of 324.61 meters. Developed by a 1,065 foot shaft with levels at 100 foot intervals. Most of the development was N of this shaft and mainly above the 850 foot level. There are more than 9,000 feet of drifts. Other shafts are 300 to 600 feet deep.
Production data are found in: Clark (1956) and Logan (1926).
Production statistics: Year: 1887 (period = 1881 to 1887): 2,057,300 grams of Au; Year: 1904 (period = 1897 to 1904): 1,371,500 grams of Au.
The best pay was said to be within the granodiorite, Cu in the lower levels.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10007125 |
|---|
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References
