Easy Bird Mine (Le Rio Mine; Outlook Mine; Big Pine Mine; Pacific Mine), Mokelumne Hill, Mokelumne Hill Mining District, East Belt, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
38° 18' 47'' North , 120° 41' 47'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mokelumne Hill | 646 (2011) | 1.6km |
| Jackson | 4,649 (2017) | 7.9km |
| Martell | 282 (2011) | 10.5km |
| Pine Grove | 2,219 (2011) | 11.6km |
| Sutter Creek | 2,488 (2017) | 12.8km |
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 |
|---|---|---|
| Amador County Gem & Mineral Society | Sutter Creek, California | 13km |
| Calaveras Gem & Mineral Society | Angels Camp, California | 30km |
| El Dorado County Mineral and Gem Society | Placerville, California | 47km |
| Gold Country Treasure Seekers | Placerville, California | 47km |
A former Au-Ag-Pb mine located in the S½ sec. 6, T5N, R12E, MDM, 1.6 km (1 mile) NNE of Mokelumne Hill, on the N slope of French Hill (S ridge of Mokelumne River Canyon). Operated during the periods 1898 to 1907, 1914 to 1917, 1931, 1933 to 1938, and 1938 to 1942. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in granodiorite and slate. The ore body strikes N70E and dips 70SE at a thickness of 12.19 meters. Calaveras slate is the country rock on the E end of the property. The Easy Bird vein is from 2 to 40 feet in thickness. The hanging wall is granodiorite and the footwall is slate. There are several other parallel and intersecting veins, with the two main being the Blue Bird and the Hummingbird. The Easy Bird vein is intersected by 13 veins striking N. The Easy Bird vein is a fault-fissure vein. The series of 13 veins include the J.P. Morgan, Challenger and Fraction veins. The ore shoots are generally 15 to 20 feet long and 100 to 360 feet long, formed at vein intersections, with some pockets found. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).
Workings include underground openings with an overall depth of 92.35 meters. Developed by a 303 foot deep verticla shaft with crosscuts to the vein at the 100, 200 and 300 feet. The drifts on these levels extend 1,100 feet NE and 900 feet SW. The adit from the S connects at the 100 level. Mining methodm was shrinkage stope.
Local structures include the Beatty Fault, which displaces the vein 50 feet to the N.
Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).
Ore averaged $4 to $6 per ton (period values). No production record found.
Analytical data results: Au to Ag ratio = 4:1. Sulfides carry 90% of Au.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Pyrrhotite Formula: Fe1-xS Description: Occurs disseminated in diorite. References: |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Galena | 2.CD.10 | PbS |
| 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 | ⓘ Galena | PbS |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10028936 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Shoofly-Olds Ferry DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090494
Bramel, Hadley R., Heyl, George R., Cox, Manning W., Ransome, Alfred L., Eric, John H., Wyant, Donald G. (1948) Copper in California. Bulletin 144. California State Mining Bureau p.219
