Quail Hill Mine (Eagle Mine; Eagle Copper and Silver Mine), Telegraph City, Foothill Copper Belt, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
37° 57' 40'' North , 120° 44' 57'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copperopolis | 3,671 (2011) | 9.7km |
| East Oakdale | 2,762 (2011) | 19.8km |
| Valley Home | 228 (2011) | 20.5km |
| Rancho Calaveras | 4,489 (2018) | 20.8km |
| 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 | 42km |
| Stockton Lapidary & Mineral Club | Stockton, California | 47km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 48km |
A former Cu-Zn-Pb-Ag-Au mine located in the W½ & S½ sec. 3 & in sec. 10, T1N, R11E, MDM, 3.1 km (1.9 miles) NNW of Telegraph City, and about 10 km (6½ miles) WSW of Copperopolis, near the Stanislaus County line. Operated during the periods 1888 to 1916 and 1917 to 1945. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a replacement deposit hosted in volcanic rock (aphanitic), greenstone and schist. The ore body is podiform/lenticular in form, strikes NW and dips 50-70NE, with a depth-to-top of 30.48 meters.
Regional grologic situation: Lower Sierra Nevada; thick sequence of lavas and pyroclastics and a variety of intrusive rocks. Both types of igneous rocks are in part metamorphosed to low-grade schsists and greenstones. The volcanics usually dip steeply NE and have a fairly constant NW strike. Schistosity, where developed, is generally parallel to the NW strike and NE dip. The largest intrusive is an irregular-shaped felsite body, 1,900 feet long and 1,500 feet wide. Dikes of greenishand diabase porphyry cutn the felsite intrusive and volcanic rocks.
The largest ore shoot, best exposed on the 205 level, widens downward below the 170 level, pinching out at the 240 level. This ore shoot parallels the adjacent hanging wall of the felsite intrusive. It dips toward the E and plunges 68SE, with a pitch length of 177 feet. Smaller ore shoots, similar in mode of occurrence, are spatially related to salients in the hanging wall of the felsite intrusive, or to faults, or to both. These shoots replaced intrusive felsite in shear zones. Local alteration includes sericitization, kaolinization, silicification, and pyritization. The most favorable ground is that lying along the trend of the downward extension of the strongly mineralized zone. Associated rocks include diabase. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).
Local geologic structures include folds and faults.
Workings include underground openings with an overall depth of 85.34 meters and comprised of a 2-compartment vertical shaft 280 feet deep with levels at 70, 170, 205, and 270 feet. Sub-levels exist at 190 and 296 feet, plus 1 adit. Mining is cvarried on in open stopes. Many portions of the mine are inaccessible due to caving.
Production: data are found in: Heyl, G.R. (1948): 114.
No production reported.
Analytical data results: Ore from the largest ore shoot gave: 5.58% Cu; 15.6% Zn; 0.40 ounce/ton Au; 6.51 ounces Ag/ton; and, 0.5 to 1.8% Pb.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
13 valid minerals.
Detailed Mineral List:
| ⓘ Baryte Formula: BaSO4 Description: Principal gangue mineral here. Granular masses reported in the early literature. |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcanthite Formula: CuSO4 · 5H2O References: |
| ⓘ Chalcocite Formula: Cu2S References: |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ 'Chlorite Group' |
| ⓘ Coquimbite Formula: AlFe3(SO4)6(H2O)12 · 6H2O References: |
| ⓘ Kalinite Formula: KAl(SO4)2 · 11H2O References: |
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 Description: A product of alteration. |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Description: A product of alteration. |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Description: A product of alteration. |
| ⓘ Native Silver Formula: Ag Habit: Arborescent Description: Occurs as arborescent forms with copper ores. References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Chalcanthite | 7.CB.20 | CuSO4 · 5H2O |
| ⓘ | Coquimbite | 7.CB.55 | AlFe3(SO4)6(H2O)12 · 6H2O |
| ⓘ | Kalinite | 7.CC.15 | KAl(SO4)2 · 11H2O |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chalcanthite | CuSO4 · 5H2O |
| H | ⓘ Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| H | ⓘ Kalinite | KAl(SO4)2 · 11H2O |
| H | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Chalcanthite | CuSO4 · 5H2O |
| O | ⓘ Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| O | ⓘ Kalinite | KAl(SO4)2 · 11H2O |
| O | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| Al | ⓘ Kalinite | KAl(SO4)2 · 11H2O |
| Al | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcanthite | CuSO4 · 5H2O |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| S | ⓘ Kalinite | KAl(SO4)2 · 11H2O |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| K | Potassium | |
| K | ⓘ Kalinite | KAl(SO4)2 · 11H2O |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcanthite | CuSO4 · 5H2O |
| Cu | ⓘ Chalcocite | Cu2S |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Ag | Silver | |
| Ag | ⓘ Native Silver | Ag |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
Other Databases
| Link to USGS MRDS: | 10102614 |
|---|
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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