Crystal Mine (Penobscott Mine), Coulterville, Coulterville Mining District, Mariposa County, California, USAi
| Regional Level Types | |
|---|---|
| Crystal Mine (Penobscott Mine) | Mine |
| Coulterville | - not defined - |
| Coulterville Mining District | Mining District |
| Mariposa County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 40' 30'' North , 120° 12' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Coulterville | 201 (2011) | 4.0km |
| Greeley Hill | 915 (2011) | 10.0km |
| Bear Valley | 125 (2011) | 13.9km |
| Groveland | 601 (2011) | 18.3km |
| Snelling | 231 (2011) | 27.0km |
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 | 30km |
A former Au-Hg mine located in secs. 15 & 16, T3S, R16E, MDM, about 2.6 miles S of Coulterville, on the upper SW slope of Horseshoe Bend Mountain (adjacent to the Cabinet & Lookout Mines), on private (patented) land. Property consists of 17.19 acres of patented land. Owned by Ralph E. and Libbie N. Dailey (1957). MRDS database stated accuracy for this location is 1,000 meters.
NOTE: California DOM Bulletin 108, Pl. 10 shows the Crystal Mine in secs. 15, 16, 21 - the same location apparently as the Cabinet Mine; the workings shown in secs. 15 & 21 on the Coulterville quadrangle are probably this mine (MRDS comment).
NOTE: There are an additional pair of MRDS files (#10163920 & #10031159) which pertain to a rather coincidental "Penobscott Mine" with alternate names including "Crystall Mine." These files apparently pertain to other mine(s) since location details do not correspond in any manner to those of this locality.
Mineralization is a vein deposit hosted in greenstone. The ore body is a pinch & swell body that strikes N60E and dips vertically.
Local alteration is hydrothermal. The Crystal vein intersects 2 parallel quartz veins (Cabinet & Lookout). The Crystal vein contains small blebs of cinnabar and hydrothermally altered greenstone. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Workings include unspecified underground openings.
Hg was never recovered in commercial amounts. No other production data were found.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Cinnabar Formula: HgS Description: Occurs as drusy crystal groups and blebs in calcite. |
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Cinnabar | HgS |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS MRDS: | 10040703 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa 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 #0060430084
