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Early Bird Mine, Sugarloaf Mountain (3), West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA

Latitude: 40°43'N
Longitude: 122°31'W
A former Cu-Au-Ag mine located in sec. 11, T33N, R6W, MDM, 3.1 km (2.0 miles) N of Sugarloaf Mountain (coordinates of record), on private land (patented) in a National Forest. Discovered in 1900. The first year of production was 1922. The lessee/operator was Mason Valley Mines Co. (1977, 1926, 1928). The U.S. Smelting, Refining and Mining Co. had an unknown involvement here (1922, 1925). MRDS database stated accuracy for this location is 10 meters.

Mineralization is a sulphide deposit (Deposit model: 184: Massive sulfide, kuroko), hosted in porphyry and rhyolite. The ore body is a replacement deposit, tabular/blanket in form with a thickness of 9.14 meters, a width of 25.91 meters and a length of 140.21 meters (300 meters ?), and with a depth to top of 10 meters. It is hosted in light gray, siliceous rhyolite. The primary mode of origin was hydrothermal and the secondary mode was contact metasomatic. Primary ore control was folding with faulting as the secondary control. There is moderate wallrock alteration (intermediate argillic, sericitic, and pyritization). The ore is largely pyrite with chalcopyrite and sphalerite, which occur interstitial to the pyrite. Local rocks include Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).

Local structures include a fault which divides the ore body, South porphyritic rhyolite which is overlain by a flow of non-porphyritic rhyolite.

Workings include underground openings with a length of 246.89 meters.

Production statistics for 1925 (1922-1925): ^10.27 % Cu, 0.015 oz/ton Au, 0.41 oz/ton Ag. For 1928 (1925-1928): ^3.4% Cu, 0.034 oz/ton Au, 2.0 oz/ton Ag.

Ore from 4 drill holes averaged .03 oz/ton Au, 1.53 oz/ton Ag and 3.01% Cu.

Mineral List

Calcite
Chalcopyrite
Muscovite
var: Sericite

Pyrite
Quartz
Sphalerite


6 entries listed. 5 valid minerals.

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References

Eric, J.C. (1948), Tabulation of Copper Deposits in California in: Copper in California, part 3: 197-387.

Clawson, R. F. (1969), Squaw Creek Copper Investigation: California Department of Water Resources Memoir Report, 29 p.

Kinkel, Arthur Rudolph, Jr., Wayne E. Hall & J.P. Albers (1956) Geology and base metal deposits of west Shasta copper-zinc district, Shasta County, California: USGS Professional Paper 285, 156 pp.: 109-112.

Moore, Lyman (1970), Copper Resources and Production of West Shasta Mining District, U.S. Bureau of Mines Report 85.

Hillman, C.T., Schumacher, O. and Gosling, B. (1977), The West Shasta District, Shasta County California, U.S. Bureau of Mines MAS Report, 40 pp.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10116552 & 10072349.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890477.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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