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Balaklala Mine (Windy Camp Mine), Sugarloaf Mountain (3), West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA

Latitude: 40°43'31"N
Longitude: 122°29'53"W
A former Cu-Au-Fe-Ag mine located in secs. 11-14, T33N, R6W, MDM, 4.2 km (2.6 miles) NNE of Sugarloaf Mountain (coordinates of record), and about 7 miles NW of Shasta Lake City, on private land (patented). Owned by the U.V. Chemical Co. (100.00%), California (1978). Discovered 1890. Production years were the 1890's, 1906-1911, 1914-1919, 1924-1925, 1926-1928, and 1948 (last year). MRDS database accuracy for this location is not stated.

Mineralization is a massive sulphide deposit (Model: 184: Massive sulfide, kuroko), hosted in the Balaklala Rhyolite (meta-rhyolite, tuff). The ore body is tabular at 22.86 meters thick and 150.00 meters wide, and 610 meters long, and a depth-to-top of 61 meters. The primary mode of origin was hydrothermal and the secondary mode was contact metasomatism. Primary ore control was faulting and secondary was folding. Wallrock alteration is moderate (sericitic, intermediate argillic and pyritization). Local rocks include Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).

Ore control descriptions: Broad ore control for the main ore zone is the contact between overlying upper and middle units of the Balaklala Rhyolite. More detail controls appear to be basin-shaped fold in rocks and thin layers of bedding plane foliation in flat-lying pyroclastic rock and shaly tuff.

Rocks in the area include the lower upper unit and upper middle unit of the Balaklala Rhyolite. The rhyolite is massive and essentially structureless. Shaly tuff and coarse and fine pyroclastic material underlies the rhyolite. Pyroclastic material ranges from thin black shale containing minor tuff layers to tan shaly tuff and thin beds of lapilli tuff with coarse volcanic breccia.

The ore presents large masses of solid Cu and Fe sulphides, with occasional Cu-Ag glance, black oxides of Ag & Cu, and native copper. Two large, separate ore bodies are known. The eastern body, near Mule Gulch, has a length of 1,200 feet (E-W) and a width of 300 feet (N-S), with a thickness of 20 to 40 feet. The other deposit, Mule Gulch, is over 900 feet long and 20 to 60 feet thick. The mineralization is Late Devonian.

Local structures include faults, folds and warps. Most faults have small offsets which are not recognized at surface. The Balaklala Fault has vertical displacement of 220 feet, downthrown on the N.

Local tectonic structures include an island arc.

Workings include underground openings with a total length of 1,524 meters and an overall depth of 27.43 meters. The developments consist of 4 tunnels at 800, 200, 80 and 70 feet long, along the outcrop, with a few shallow shafts. There are also 3,500 feet of drifting and crosscutting.

Assay analyses results: 1928: (1902-1928): ore: ^2.8% Cu, 1.3% Zn (?),1.0 oz/ton Ag, and 0.028 oz/ton Au.

Mineral List

Baryte
Calcite
Chalcocite
Chalcopyrite
'Chlorite Group'
Copper
Covellite
Gold
Greenockite
Malachite
Muscovite
var: Sericite

Pyrite
Quartz
Sphalerite
Tetrahedrite


15 entries listed. 13 valid minerals.

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References

Crawford, James John (1894), Twelfth report of the State Mineralogist: California Mining Bureau. Report 12: 245.

Aubury, Lewis E. (1902), The copper resources of California: California Mining Bureau Bulletin 23: 65.

Brown, G.C. (1916b), Shasta, Siskiyou, Trinity Counties: California Mining Bureau. Report 14: 761-762.

Laizure, Clyde McK (1921), Redding field division: California Mining Bureau. Report 17: 528.

Tucker, W. Burling (1924b), Copper resources of Shasta County: California Mining Bureau. Report 20: 427, 445.

Averill, Charles V. (1939), Mineral resources of Shasta County: California Division of Mines Report 35: 127.

Eric, J.C. (1948), Tabulation of Copper Deposits in California in: Copper in California: California Division of Mines Bulletin 144: 197-387.

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 PP 285, 156 pp.: 102-107.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 130, 134, 159, 162.

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

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 County California, U.S. Bureau of Mines MAS Report, 40 pp.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 92, 98, 100.

University of California, Berkeley (1988), Mining Waste Study, Final Report (July, 1988), 416 pp.: 231-235.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077587 & 10140509.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890

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