Eureka Mine (Eureka & Grizzly Mine; Eureka claim; Grizzly claim), Big Oak Flat, Big Oak Flat Mining District, East Belt, Tuolumne County, California, USAi
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Latitude & Longitude (WGS84):
37° 49' 22'' North , 120° 16' 34'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Groveland | 601 (2011) | 4.2km |
| Coulterville | 201 (2011) | 14.2km |
| Chinese Camp | 126 (2011) | 14.8km |
| Greeley Hill | 915 (2011) | 15.5km |
| Tuolumne City | 1,779 (2011) | 15.8km |
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 |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 36km |
| Mariposa Gem & Mineral Club | Mariposa, California | 46km |
Mindat Locality ID:
11049
Long-form identifier:
mindat:1:2:11049:8
GUID (UUID V4):
fc51a173-3124-4c26-a770-7e3c9f0e6caa
A former pocket lode Au mine located in the E½ sec. 26, and in sec. 35, T1S, R15E, MDM, 1.6 km (5,100 feet) W of Big Oak Flat, and N of Priest (about ½ mile NW of Priest, between the old Priest grade and state highway 120). The property is comprised of 2 claims, both discovered in 1894. MRDS database stated accuracy for this location is 500 meters. The Criss Cross and Relief claims are on the SE.
Mineralization is a vein deposit hosted in slate. The ore body strikes NW and dips 80-90NE at a thickness of 0.61 meter. Gold ore was found in black slate, at the contact of, or near felsite dikes which cut the formation. Considerable ore was also found along a fault that dislocated a small quartz vein. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).
Workings include underground openings comprised of several adits, the longest of which was 300 feet. There were also several short drifts, winzes and stopes.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Gold Formula: Au Description: A beautiful specimen was found in loose quartz crystals and talc. It measured 6 x 13 inches (15 x 32.5 cm) and weighed 67 Troy ounces (1946). References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ Quartz var. Rock Crystal Formula: SiO2 References: |
| ⓘ Talc Formula: Mg3Si4O10(OH)2 References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Rock Crystal | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Talc | Mg3Si4O10(OH)2 |
| O | ⓘ Quartz var. Rock Crystal | SiO2 |
| Mg | Magnesium | |
| Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Talc | Mg3Si4O10(OH)2 |
| Si | ⓘ Quartz var. Rock Crystal | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10077933 |
|---|
Other Regions, Features and Areas containing this locality
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0061090425
