Alpine Mine (Union Consolidated Mine; Alpine Gold Mining Co.), Fornis, Georgetown District, East Segment Mother Lode, El Dorado County, California, USAi
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Latitude & Longitude (WGS84):
38° 53' 11'' North , 120° 51' 30'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Georgetown | 2,367 (2011) | 2.8km |
| Auburn Lake Trails | 3,426 (2011) | 8.7km |
| Coloma | 529 (2011) | 10.0km |
| Cool | 4,100 (2017) | 13.5km |
| Foresthill | 1,483 (2011) | 15.3km |
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 | 18km |
| Gold Country Treasure Seekers | Placerville, California | 18km |
| Roseville Rock Rollers | Roseville, California | 40km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 41km |
| Fossils for Fun Society, Inc. | North Highlands, California | 50km |
A former lode Au mine located in secs. 15 & 16, T12N, R10E, MDM, 0.7 km m(0.5 miles) SSE of Fornis and 2.9 km (9,500 feet) SW of Georgetown, along Manhattan Creek, on private land. Operated during the late 1860's, 1888, 1902, 1912, and 1933 to 1938. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a vein deposit hosted in amphibolite. The ore body strikes NW and dips 60NE at a depth to top 0.00 meters. Controls for ore emplacement included flat-dipping ore shoots, about 100 feet long at fault intersections with the vein. The quartz is white and sugary. Most of the Au is free and finely disseminated. Minor amounts of sulfides are present in the ore (about 0.5%). Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Local geologic structures include: A number of South-dipping veins cross the ore vein and dip 25S.
Workings include underground openings comprised of a 400 foot shaft with levels at 100, 200, 300, 350 and 400 feet, and a 430 sub-level.
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: | 10006992 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- California
- Mother Lode BeltBelt
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060170541 & 0060170542
