Big Sandy Mine (James Marshall), Kelsey, Kelsey Mining District, El Dorado County, California, USAi
| Regional Level Types | |
|---|---|
| Big Sandy Mine (James Marshall) | Mine |
| Kelsey | Unincorporated Community |
| Kelsey Mining District | Mining District |
| El Dorado County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 47' 20'' North , 120° 49' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coloma | 529 (2011) | 6.2km |
| Cold Springs | 446 (2011) | 6.8km |
| Placerville | 10,650 (2017) | 6.8km |
| Diamond Springs | 11,037 (2011) | 10.5km |
| Deer Park | 1,384 (2018) | 11.9km |
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 | 7km |
| Gold Country Treasure Seekers | Placerville, California | 7km |
| Roseville Rock Rollers | Roseville, California | 41km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 44km |
| Fossils for Fun Society, Inc. | North Highlands, California | 49km |
A former lode Au mine located in the SE¼NW¼ sec. 24, T11N, R10E, MDM, 1.1 km (0.7 mile) S of Kelsey, N of Texas Canyon, on private land. Operated by H. J. Picchetti. The claim is comprised of 10.33 acres. Adjoins the Grey Eagle claim on the S. Operated in the 1890's and 1930's. MRDS database stated accuracy for this location is 500 meters.
The property was originally located by James W. Marshall. It was worked for pocket Au during the 1930's and several fine specimens of crystallized gold were recovered. The deposit is on the Mother Lode Belt.
Mineralization is a vein/pocket deposit hosted in Mariposa slate. The ore body strike N12W and dips 70E at a thickness of 4.57 meters. Crystalline Au occurs in pockets. On surface near the shaft the footwall rock is an amphibolite schist dike, and the section across the claim shows in order going E: bands of porphyry (altered/obscure), soapstone, ankerite, and talcose schist. The vein matter is 15 feet wide and is composed of stringer leads of quartz and carbonates in altered schist and Mariposa slate 50 feet wide. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include surface and underground openings with an overall depth of 103.63 meters. an overall length of 228.6 meters and an overall width of 4.57 meters. The mine is developed by an open cut 750 feet long and a 340 foot vertical shaft with 4 levels at 60, 120, 227 & 323 feet. The vein is intersected by the shaft at 240 feet. There are numerous drifts.
Production data are found in: Logan, Clarence August (1934).
Most of the ore was low-grade with average values from $1.75 to $2.25 (period values) per ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| ⓘ Native Gold Formula: Au Description: Fine, crystalline, specimen gold found in pockets. |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 Description: Occurs as soapstone and in talcose schist. |
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 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10101105 |
|---|
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 #0060170444
