Monarch-Sugar Loaf Mine (Monarch Sugar Loaf Mine), Mount Aigare, Shingle Springs Mining District, West Belt, El Dorado County, California, USAi
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Latitude & Longitude (WGS84):
38° 36' 13'' North , 120° 51' 55'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Shingle Springs | 4,432 (2011) | 8.7km |
| Deer Park | 1,384 (2018) | 9.4km |
| Diamond Springs | 11,037 (2011) | 11.0km |
| River Pines | 379 (2011) | 12.3km |
| Cameron Park | 18,228 (2011) | 12.8km |
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 | 15km |
| Gold Country Treasure Seekers | Placerville, California | 15km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 24km |
| Roseville Rock Rollers | Roseville, California | 40km |
| Fossils for Fun Society, Inc. | North Highlands, California | 45km |
A former lode Au-Cu-Zn-Pb mine located in the SE¼NW¼ & NE¼SW¼ sec. 27, T9N, R10E, MDM, about 5 km E of Mount Aigare and 3.3 km (2.0 miles) NNW of Nashville (Nashville District), on the western slope of Logtown Ridge, on private land. The claim contains 18.42 acres. Operated by George Ross. Originally worked in the 1850's and during the period 1870 to 1907. Prospected in the 1930's and 1953-1954. Early in 1955 the present lessee leased the mine and had been mining some high-grade ore from small pockets in the vein. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in fine-grained, Late Jurassic andesite of the Logtown Ridge Formation. The ore body strikes NNW with a flat dip. The Au is chiefly in small but rich ore shoots with little or no sulfides near surface. Sulfides increase with depth. Chalcopyrite and sphalerite are the most common. Pyrite and galena are present in smaller amounts. Much of the most recent output has been specimen material. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include surface and underground openings comprised of open cuts and shallow shafts for about 2,000 feet along the strike. Recent work was in a new 70 foot crosscut adit and several nearby open cuts in the central portion of the deposit. Some workings were rehabilitated. Developed by open cuts and shallow shafts for approximately 2,000 feet along strike.
No production record was found.
Some high-grade ore was obtained from pockets in 1955., near surface.
Analytical data results: Sulfide concentration increases with depth.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Native Gold Formula: Au Description: Includes specimen material. |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| 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 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10006917 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060170315
