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Shasta King Mine (Lost Desert Mine; Trinity Mine), Mammoth Butte, Backbone District, West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA

Latitude: 40°43'59"N
Longitude: 122°29'46"W
A former Cu-Au-Ag-Zn (trace) mine located in secs. 11 & 12, T33N, R6W, MDM, 3.9 km (2.5 miles) SSW of Mammoth Butte (coordinates of record), on private land (patented). Owned by the Silver King Mining Co. (100.00%), California (1978). Production years were 1908-1909 and 1918-1919. MRDS database stated accuracy for this location is 10 meters.

Mineralization is a replacement sulphide deposit (Deposit model: 184: Massive sulfide, kuroko), hosted in porphyry and rhyolite. The ore body is lenticular at 12.8 meters (and/or 8 meters) thick, 152.4 meters (and/or 70 meters) wide and 179.83 meters (and/or 150 meters) long. The primary mode of origin was hydrothermal and the secondary mode was contact metasomatism. Primary ore control was folding and the secondary control was fracturing.

Controls for ore emplacement included the partial or complete replacement of a thin flow of porphyritic rhyolite that lies between a bed of pyroclastic rock above and a flow of non-porphyritic rhyolite below. Ore solutions were apparently stopped by pre-mineral foliated bands of gouge and sericite.

The ore body replaced the Balaklala Rhyolite. Rocks adjoining the ore body are porphyritic and non-porphyritic varieties of this rhyolite. A bed composed of shaly, rhyolitic tuff, interlayered with fine and coarse volcanic breccia lies immediately above gossan at the surface. It is also found in back of the stopes in the SW part of the mine.

Alteration is local and wall rock alteration is intense (hydrothermal, chloritization, intermediate argillic, propylitic and pyritization). The ore is uniform and structureless in appearance, composed principally of massive pyrite and lesser amounts of chalcopyrite and sphalerite. Local rocks include Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).

Local structures include pre-mineral and post-mineral faults. Evidence for pre-mineral age on faults Nos. 3 , 5 & 12 is the pressence of pyrite and pyrite clasts filled with iron oxide, along faults away from the ore body. All faults, except No. 12, show post-mineral movement (horizontal). horizontal movements have been suggested to occur along faults No. 2, 5 & 7 as well as vertically.

Production data are found in: Kinkel, et al (1956): 140.

Analytical data results: 2.5% Cu, 7.61% Zn.

Year: 1919: period: 1908 - 1919: ^2.92% Cu, 1.01 oz/ton Ag, 0.034 oz/ton Au.

Mineral List

Chalcocite
Chalcopyrite
Copper
Galena
Muscovite
var: Sericite

Pyrite
Sphalerite


7 entries listed. 6 valid minerals.

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References

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

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

Kinkel, Arthur Rudolph, Jr. & Hall, W.E. (1951) Geology of the Shasta King mine, Shasta County, California. California Division of Mines and Geology Special Report 16, 11 pp.

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.: 138-144.

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

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.

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.

University of California, Berkeley (1988), Mining Waste Study, Final Report (July, 1988), 416 pp.: 231-235 [215-219].

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077588 & 10165129.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890361.

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