Eclipse Placer Mine (Infernal Placer Mine), Mokelumne Hill, Mokelumne Hill Mining District, East Belt, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
38° 16' 7'' North , 120° 42' 30'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mokelumne Hill | 646 (2011) | 3.5km |
| San Andreas | 2,783 (2011) | 8.4km |
| Jackson | 4,649 (2017) | 10.6km |
| Martell | 282 (2011) | 13.3km |
| Valley Springs | 3,553 (2011) | 13.6km |
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 | 16km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 27km |
A placer drift Au occurrence/mine located in sec. 24, T5N, R11E, MDM, about 3.65 km S of Mokelumne Hill (town), along Woman Gulch, S of the McSorley Ranch. Operated intermittently during the periods 1895-1914, 1934-1937, 1950, and 1957-1958. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a placer Au deposit located in a paleochannel that is overlain with a cemented conglomerate and a basalt lava flow. The gold is coarse and mainly on the bedrock, which consists of a soft, decomposed slate. Many boulders included in the gravel. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) and/or Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include underground openings comprised of a 250 foot adit with drifts.
Virgin ground was said to average $3 to $6 per cubic yard (period values). 1,000 cubic yards of gravel yielded $6,000 (period values) in 1937.
Present operators (??) were prospecting for the unworked portion of the channel and have obtained some production from remaining loose gravel pockets in old workings, which have been crosscut.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10028719 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090314
