Black Hill Mine (Pumpkin Mine), Mary Harrison group, Coulterville, Coulterville Mining District, Mariposa County, California, USAi
| Regional Level Types | |
|---|---|
| Black Hill Mine (Pumpkin Mine) | Mine |
| Mary Harrison group | - not defined - |
| Coulterville | - not defined - |
| Coulterville Mining District | Mining District |
| Mariposa County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 43' 11'' North , 120° 12' 24'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coulterville | 201 (2011) | 1.3km |
| Greeley Hill | 915 (2011) | 7.3km |
| Groveland | 601 (2011) | 13.4km |
| Bear Valley | 125 (2011) | 18.4km |
| Chinese Camp | 126 (2011) | 26.1km |
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 |
|---|---|---|
| Mariposa Gem & Mineral Club | Mariposa, California | 34km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 49km |
A former lode Au mine located in the E½ (estimated) sec. 33, T2S, R16E, MDM, 1.3 km (4,400 feet) NW of Coulterville, along Blacks Creek. Discovered in 1867. Operated last during the period 1900 to 1902. Property consisted of patented (private) land. Operated by Louise A. Boyd. MRDS database stated accuracy for this location is 1,000 meters. This mine is the most northerly mine in the Mary Harrison group, which is aligned on a branch of the Mother Lode vein system commonly called the East Branch.
Mineralization is an en echelon vein system hosted in serpentinite. The ore body strikes N35W and dips 45NE at a thickness of 6.1 meters. Serpentine is near slate. Low grade ore was also found as pyritic impregnations in serpentine wall rock adjacent to the vein. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).
Workings include underground openings comprised of the main inclined shaft surmounted by a wooden headframe and ore bin, two tunnels, several auxilliary shafts and stopes.
Production data are found in: Bowen, O.E., Jr. & C.H. Gray, Jr. (1957).
Little record of activity before the 1890's when considerable development work must have been done. The mine reopened in 1900 and some rich ore was discovered. Very little has been done on the property since 1902 and workings were caved and inaccessible in September, 1954.
Low grade ore.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 Description: Occurs as pyritic impregnations in serpentine wall rock adjacnet to the vein. |
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 | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10102847 |
|---|
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 ID #0060430048
