Soulsby Mine (Churchill; Johnson & Bradbury; Pennsylvania; Platt & Gilson), Soulsbyville, Soulsbyville & Confidence Mining District, East Belt, Tuolumne County, California, USAi
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Latitude & Longitude (WGS84):
37° 59' 15'' North , 120° 15' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Soulsbyville | 2,215 (2011) | 0.5km |
| Mono Vista | 3,127 (2011) | 1.4km |
| Tuolumne City | 1,779 (2011) | 3.2km |
| Phoenix Lake | 4,269 (2017) | 4.6km |
| Twain Harte | 2,226 (2011) | 6.3km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 26km |
A former Au-Zn-Pb-Bi-Te mine located in the NW¼ sec. 31, T2N, R16E, MDM, 0.4 km (1,300 feet) NE of Soulsbyville, on private property. Discovered either in 1852 or 1856, depending on data source. Mining took place at least as late as 1911. MRDS database stated accuracy for this location is 500 meters. This group of claims included the Churchill, Johnson & Bradbury, Pennsylvania, Platt & Gilson, and Soulsby mines, which was the principal mine and was recorded in 1856.
The original mine was called the Soulsby, which was later consolidated with several other adjacent mines (Johnson and Bradbury, Platt, Gilson, Churchill). It is the largest producer in the East Belt of gold mineralization. Despite this standing, there is relatively little easily available information on this deposit.
Mineralization is a vein deposit (Model code 273; USGS model code 36a; deposit model name: Low-sulfide Au-quartz vein; Mark3 model number 27), hosted in Mesozoic-Paleozoic quartzite of the Calaveras Complex or Shoo Fly Complex, Jurassic granodiorite of the Standard pluton and Mesozoic diorite. The vein averages 15 inches in thickness. No local alteration reported. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).
LOCAL GEOLOGY: The Soulsby Mine is developed mainly in a quartz-vein system, the Soulsby, which cuts granodiorite of the Jurassic Standard Pluton, a roof pendant of metamorphic rock of either the Calaveras Complex or Shoo Fly Complex, and diorite dikes. Julihn and Horton (1940) reported the metamorphic rock as quartzite. The vein system strikes N10W to N20W and has an average dip of about 80NE, although in places it is vertical or has a steep dip to the west. It averages about 18 inches in width where mined and consists of a single vein in the north part of the deposit, which then splits into two veins in the south part after the system enters the granodiorite body. Diorite dikes are reportedly present along the vein system, although their relationship to the ore is not clear from available reports on the deposit. Ore comprises native gold and auriferous sulfides (pyrite, galena, sphalerite, and chalcopyrite).
Mineralization also includes an unspecified Bi telluride (Sharwood).
Workings include underground openings. Workings consist of several shafts with associated drifts and some crosscuts. It may have reached a maximum vertical depth of about 750 feet. There are 2 main shafts at 800 and 900 feet deep by 1890, with extensive drifting and stopes.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS References: |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS References: |
| ⓘ Tetradymite Formula: Bi2Te2S |
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 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Tetradymite | 2.DC.05 | Bi2Te2S |
| ⓘ | 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 | ⓘ Pyrrhotite | Fe1-xS |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Tetradymite | Bi2Te2S |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Te | Tellurium | |
| Te | ⓘ Tetradymite | Bi2Te2S |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
| Bi | Bismuth | |
| Bi | ⓘ Tetradymite | Bi2Te2S |
Other Databases
| Link to USGS MRDS: | 10034631 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Shoofly-Olds Ferry DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0061090019
Soulsby Mine, Soulsbyville, Soulsbyville & Confidence Mining District, East Belt, Tuolumne County, California, USA