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Sutro Mine, Bohemotash Mountain, Backbone District, West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA
Latitude: 40°46'53"N
Longitude: 122°27'48"W
Longitude: 122°27'48"W
Mineralization is a replacement sulphide deposit (Deposit model: 184: massive sulfide, kuroko), hosted in rhyolite. There are poor outcrops and no lithologic offsets in uniform upper unit of the Balakalala Rhyolite over the ore body.
The ore body is lenticular. The primary mode of origin is hydrothermal and the secondary mode is contact metasomatism. Primary ore xcontrol was folding and the secondary mode was fracturing. Wallrock alteration is local and moderate (pyritization, intermediate argillic and sericitic). Controls for ore emplacement included the contact between upper and middle units of the Balaklala Rhyolite. Local rocks include Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).
The ore body is situated in light green siliceous rhyolite, uppermost part of the middle unit of the Balaklala Rhyolite. Rocks in the mine area are cut by many mafic dikes. The largest dike is 25 feet wide and is continuous. The rocks in the area are gently dipping to flat, but contain several broad warps. The mine appears to be on the S flank of a large warp.
Local structures include faults which are not seen at surface, poor outcrops and no lithologic offsets in the uniform Upper Unit of the Balakalala Rhyolite over the ore body.
Workings include underground openings which are not accessible. They are comprised of 6 adits, one NE at 2,000 feet long with extensive drifting.
Production data are found in: Kinkel et al (1956): 150.
Production was 35,300 tons of ore, which contained 7.44% Cu, 6.40 oz/ton Ag, and 0.08 oz/ton Au.
Analytical data results: Ore contained from 2.5-11% Cu, 2.5-8.1 oz/ton Ag, and 0.03-0.10 oz/ton Au.
Mineral List
| Chalcopyrite | Muscovite var: Sericite | Pyrite | Pyrrhotite |
4 entries listed. 3 valid minerals.
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References
Tucker, W. Burling (1924b), Copper resources of Shasta County: California Mining Bureau. Report 20: 428-433.
Root, L.L. (1926) Twenty-second report of the State Mineralogist. California Mining Bureau Report 22, 610 pp.: 146-149.
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.: 149-151.
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.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 312.
Lydon, Philip Andrew and O’Brien, J.C. (1974) Mines and mineral resources of Shasta County, California. California Division of Mines and Geology County Report 6, 154 pp.: 109.
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: 70, 92 (map 3-4).
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 #10077554 & 10213396.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890238.
Root, L.L. (1926) Twenty-second report of the State Mineralogist. California Mining Bureau Report 22, 610 pp.: 146-149.
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.: 149-151.
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.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 312.
Lydon, Philip Andrew and O’Brien, J.C. (1974) Mines and mineral resources of Shasta County, California. California Division of Mines and Geology County Report 6, 154 pp.: 109.
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: 70, 92 (map 3-4).
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 #10077554 & 10213396.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890238.
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