Hexter Placer Mine, Mokelumne Hill, Mokelumne Hill Mining District, East Belt, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Hexter Placer Mine | Mine |
| Mokelumne Hill | Hill |
| Mokelumne Hill Mining District | Mining District |
| East Belt | - not defined - |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 17' 17'' North , 120° 43' 6'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mokelumne Hill | 646 (2011) | 1.7km |
| Jackson | 4,649 (2017) | 8.3km |
| San Andreas | 2,783 (2011) | 10.7km |
| Martell | 282 (2011) | 11.1km |
| Sutter Creek | 2,488 (2017) | 13.8km |
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 |
|---|---|---|
| Amador County Gem & Mineral Society | Sutter Creek, California | 14km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 29km |
| El Dorado County Mineral and Gem Society | Placerville, California | 50km |
| Gold Country Treasure Seekers | Placerville, California | 50km |
Mindat Locality ID:
75354
Long-form identifier:
mindat:1:2:75354:9
GUID (UUID V4):
71aedb12-545f-4a26-a505-5a6af1ee0b07
A placer Au-opal occurrence/mine located in the NW¼ sec. 13, T5N, R11E, MDM, 1.7 km (1.1 miles) SW of Mokelumne Hill (town) (on the NW slope of Stockton Ridge). Operated during the period 1896 to 1899. Idle since 1917. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a placer Au deposit located on the Duryea paleochannel. Pay gravel is 150 feet wide and 7 feet deep and is slightly cemented. The bedrock is diorite and the channel capping is rhyolitic and andesitic material, which form the crest of Stockton Ridge (Stockton Hill). Opals were found on the property; however, they were too soft to use a s gemstones. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).
Workings include underground openings comprised of a 2,000 foot tunnel driven in the bedrock. The channel was drifted on for a distance of 500 feet N and 500 feet S. A main haulage way was driven 1,400 feet during the period 1896 to 1899.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Gold Formula: Au Description: Placer material occurring in a paleochannel. |
| ⓘ Opal Formula: SiO2 · nH2O Description: Type not specified. Soft material unsuited for gemstones. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Opal | SiO2 · nH2O |
| O | Oxygen | |
| O | ⓘ Opal | SiO2 · nH2O |
| Si | Silicon | |
| Si | ⓘ Opal | SiO2 · nH2O |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10109141 |
|---|
Other Regions, Features and Areas containing this locality
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090291
