Grizzly Flat Mining District, East Belt, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| 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° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~58km
Type:
Köppen climate type:
Mindat Locality ID:
264122
Long-form identifier:
mindat:1:2:264122:8
GUID (UUID V4):
486c7c19-ea6f-4c0e-9022-90408ad37976
Location: The Grizzly Flat district is in south-central El Dorado County about 25 miles east of Placerville. It is in the Sierra Nevada east gold belt and includes the Hazel Valley and Baltic Peak areas. It is both a lode and placer gold-mining district.
History: The streams were originally mined during the gold rush. The camp was established in 1850 and named for a grizzly bear that surprised a group of miners during an evening meal. The Mt. Pleasant mine was discovered in 1851. There was much activity in both the lode and placer mines from the 1870's through the early 1900's. There was some mining activity again during the 1930's. The Hazel Creek mine was discovered in 1948 and was worked on a fair-sized scale until 1958.
Geology: The southern part of the district is underlain by granodiorite, which extends west from the mass of the Sierra Nevada batholith. To the north is slate, phyllite, and graphitic and mica schist of the Calaveras Formation (Carboniferous to Permian), which in places contains small tactite bodies. There are several patches of Tertiary gravels overlain by andesite that are part of the south-extending Tertiary channel of the Mokelumne River.
Ore Deposits: A number of north-trending quartz veins and stringers are found in both the granodiorite and metamorphic rocks. The ore contains free gold and abundant sulfides, especially galena. The ore averages Yz to more than one ounce of gold per ton, but few ore shoots were more than 100 feet long or attained much depth. The Tertiary channel gravels are thin and the channels narrow, but in some places they were extremely rich.
Mines: Lode: Blue Gouge, Cosumnes (Melton) ($100,000+). Daily and Bishop, Eagle, Eagle King, Hazel Creek ($1 million+), Morey, Mt. Hope, Mt. Pleasant ($1 million+), and the Sunday. Placer: Grizzly Flat drift, Payne drift.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
Mineral list contains entries from the region specified including sub-localities11 valid minerals.
Detailed Mineral List:
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 |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scheelite | Ca(WO4) |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Stibnite | Sb2S3 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Localities in this Region
- California
- El Dorado County
- East Belt
- Grizzly Flat Mining District
- East Belt
- El Dorado County
- California
- El Dorado County
- East Belt
- Grizzly Flat Mining District
- Grizzly Flat
- Happy Valley
- Hazel Valley (Hazel Canyon)
- Grizzly Flat Mining District
- East Belt
- El Dorado County
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References
Grizzly Flat Mining District, East Belt, El Dorado County, California, USA