Mar John Mines Company (Old Calaveras group; Enchantress; Oro Minto), Calaveritas, Calaveritas Mining District, East Belt, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Mar John Mines Company (Old Calaveras group; Enchantress; Oro Minto) | - not defined - |
| Calaveritas | Unincorporated Community |
| Calaveritas Mining District | Mining District |
| East Belt | - not defined - |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 11' 13'' North , 120° 32' 51'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mountain Ranch | 1,628 (2011) | 4.6km |
| Murphys | 2,213 (2015) | 9.3km |
| San Andreas | 2,783 (2011) | 11.7km |
| Forest Meadows | 1,249 (2015) | 12.5km |
| Vallecito | 442 (2011) | 12.5km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 13km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 32km |
A former lode Au-Co-Pb-Zn mine located in the SW¼NW¼ sec. 21, T4N, R13E, MDM, about 6.65 km NE of Calaveritas, SE of Old Gulch (2 miles SE of Sheep Ranch). Operated during the 1870's to 1884 and from 1885 to 1938 intermittent work was done. The Old Calaveras group was worked as early as 1872. MRDS database stated accuracy for this location is .
Mineralization is hosted in mica schist, slate and quartzite. The ore body strikes N70E and dips SE at a thickness of 1.22 meters. The country rock is the Calaveras Formation. There are 5 veins from 2 to 4 feet thick in thickness and trend NE. The principal vein is the Calaveras (strike and dip provided above). Small amounts of diorite and gabbro are found on the dumps. Small amounts of smaltite and erythrite with arsenopyrite are found in a quartz stringer a few inches wide on the Co propsect. It is hosted in mica schist and quartzite. The 5 veins are: the Calaveritas (3 to 4 feet thick); Washington Pescia vein (6 feet thick); Intermediate vein (1.5 feet thick); Enchantress vein (2 feet thick); and, the South Bank vein (2.5 feet thick). The cobalt was mine on the N end of the property. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include underground openings with an overall depth of 137.16 meters and comprised of a 450 foot shaft (Mar John or Calaveras), with levels at 120, 240, 350 and 450 feet. There is a 350 foot shaft 400 feet to the SE. Most of the stoping was between the 2 shafts. Crosscuts were driven to the NW and SE from the 350 foot level.
Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Erythrite Formula: Co3(AsO4)2 · 8H2O |
| ⓘ Galena Formula: PbS |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Skutterudite Formula: CoAs3 |
| ⓘ 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 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | Skutterudite | 2.EC.05 | CoAs3 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Erythrite | 8.CE.40 | Co3(AsO4)2 · 8H2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| O | Oxygen | |
| O | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| Co | Cobalt | |
| Co | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| Co | ⓘ Skutterudite | CoAs3 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| As | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| As | ⓘ Skutterudite | CoAs3 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10029485 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Shoofly-Olds Ferry DomainDomain
- Sierra Nevada BatholithVolcanic Arc
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