Lucky Marion Mine (Shepard), Greenwood, Greenwood District, Northwest Segment Mother Lode, El Dorado County, California, USAi
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Latitude & Longitude (WGS84):
38° 54' 9'' North , 120° 55' 40'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Auburn Lake Trails | 3,426 (2011) | 2.5km |
| Cool | 4,100 (2017) | 7.7km |
| Georgetown | 2,367 (2011) | 7.7km |
| Coloma | 529 (2011) | 11.9km |
| Auburn | 13,953 (2017) | 12.9km |
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 | 22km |
| Gold Country Treasure Seekers | Placerville, California | 22km |
| Roseville Rock Rollers | Roseville, California | 35km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 37km |
| Fossils for Fun Society, Inc. | North Highlands, California | 45km |
A former lode Au occurrence/mine located in the SW¼ sec. 12, T12N, R9E, MDM, 1.5 km (1.0 mile) WNW of Greenwood, ENE of Penobscot Farm. Operated 1896 to 1897 and in 1901. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in Mariposa slate. The ore body strikes N30W and dips 56NE at a thickness of 0.61 meter. The hanging wall is serpentinite and the footwall is slate. A talcose schiost encases the vein. A greenish quartz stringer, 1½ to 2 feet thick, with coarse gold occurs 85 feet down the main shaft and is high-grade ore. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include underground openings comprised of a 112 foot inclined shaft.
Production data are found in: Clark, Wm. B. & D.W. Carlson (1956).
Analytical data results: High-grade ore = 2% Au-bearing pyrite.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrite var. Gold-bearing Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 Colour: Greenish |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Description: Occurs as talcose schist encasing the Au-bearing stringer. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite var. Gold-bearing Pyrite | 2.EB.05a | FeS2 |
| ⓘ | 2.EB.05a | FeS2 | |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Pyrite var. Gold-bearing Pyrite | FeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite var. Gold-bearing Pyrite | FeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10006843 |
|---|
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 #0060170171
