Potosi Mine (Spring Gulch Mining Company; Muletown Consolidated Mine), Igo (South Fork), South Fork Silver District, West Shasta Copper - Zinc Mining District, Klamath Mountains, Shasta County, California, USAi
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Latitude & Longitude (WGS84):
40° 31' 57'' North , 122° 31' 40'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Shasta | 1,771 (2011) | 8.0km |
| Keswick | 451 (2011) | 11.3km |
| Redding | 91,582 (2017) | 13.0km |
| French Gulch | 346 (2011) | 20.9km |
| Central Valley (historical) | 4,340 (2015) | 21.1km |
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 |
|---|---|---|
| Shasta Gem & Mineral Society | Redding, California | 13km |
A former lode Au mine located in secs. 15 & 22, T31N, R6W, MDM (sections projected), 3.2 km (2.0 miles) NNE of Igo. Production years were intermittant from 1856 to 1933. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in greenstone and diorite. The ore body is pinch and swell in form, strikes N and dips steeply W, at a thickness of 1.22 meters. The vein is 15 inches to 4 feet thick. The vein is iron stained in the oxidized zone. A sulfide zone was encountered at depth. Local rocks include Mesozoic granitic rocks, unit 4 (Klamath Mountains and Northern Sierra Nevada) and/or Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).
Workings include underground openings comprised of 3 shafts: A 90 foot deep shaft exposed an ore shoot 4 to 16 inches x 100 feet, of high-grade value; a second shaft at 75 feet deep has 210 feet of drifts; and the third shaft at 55 feet deep has 380 feet of stopes.
Production data are found in: Lydon, P.A. and O'Brien, J.C., (1974).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10077573 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Klamouth RangeVolcanic Arc
- Shoofly-Olds Ferry DomainDomain
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060890298
