Gopher Hill Mine (Gopher Ridge), Telegraph City, Foothill Copper Belt, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Gopher Hill Mine (Gopher Ridge) | Mine |
| Telegraph City | Unincorporated Community (Former) |
| Foothill Copper Belt | Belt |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 57' 16'' North , 120° 44' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 9.4km |
| East Oakdale | 2,762 (2011) | 19.2km |
| Valley Home | 228 (2011) | 20.3km |
| Rancho Calaveras | 4,489 (2018) | 21.7km |
| Angels Camp | 2,677 (2012) | 21.9km |
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 | 22km |
| Mother Lode Mineral Society | Modesto, California | 41km |
| Stockton Lapidary & Mineral Club | Stockton, California | 48km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 49km |
A former lode Au-Ag-Cu-Pb-Zn mine located in the NE¼ sec. 10, T1N, R11E, MDM, 2.3 km (1.4 miles) N of Telegraph City, on the divide between Buckham Gulch and Copper Gulch. Operated during 1921 and 1934 to 1936. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a vein deposit hosted in greenstone. The ore body strikes NW and dips NE at a thickness of 0.46 meters. The vein is 1½ feet thick in pyritized greenstone. Two thirds of the rock is base ore with traces of As & Bi. Neither Cu or Zn ore was observed in situ. Controls for ore emplacement included the shear zones, along which the ore was emplaced, and elsewhere in schistose rocks. Much finely disseminated pyrite is present. These pyritized zones generally carry some Au & Ag. A quartz porphyry intrusion occurs S of the mine. It is 5 to 700 feet in diameter and is responsible for the shear zones near the mine. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Local geologic structures include shear zones with a NW trend and a steep dip.
Workings include underground openings with a length of 117.04 meters and comprised of an 84 foot deep shaft with levels at 40 and 80 feet.
Production data are found in: Logan, Clarence August and Franke, H. (1936); Clark, Wm. B. & P.A. Lydon (1962).
Analytical data results: Assay samples range from $0.85 to $14.00 (period values) Au per ton, and from 0.01 to 39.0 ounces Ag per ton.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 Description: Finely divided material disseminated in schistose rocks. |
| ⓘ Quartz Formula: SiO2 |
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 |
| 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 | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10028623 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- California Central ValleyAccretionary Complex
- Foothills-Wallowa DomainDomain
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