Bluestone River Mine, Port Clarence District, Nome Borough, Alaska, USA
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Geology: Bedrock in the Bluestone River drainage is mostly a metapelitic sequence with local metamorphosed mafic intrusive bodies (Sainsbury, 1972). South and east tributaries to the Bluestone River, such as Gold Run Creek, have bedrock assemblages that include chlorite schist, some amphibolite, and metamorphosed mafic intrusive bodies. In places, the retrograded greenschist facies mafic bodies preserve remnant blueschist facies minerals. The ages of these assemblages are not known but they are probably Paleozoic. Sainsbury and others (1969) mapped placer mining operations along 1.25 miles of the main drainage at surface elevations between 95 and 145 feet. Cobb and Sainsbury (1972) show another area of operations 0.5 miles north (downstream) of those mapped by Sainsbury and others (1969). Other locations of placer mining further upstream on Bluestone River are parts of tributary mining locations (Gold Run and Skookum Creeks; Sainsbury and others, 1969). The placer deposits below elevations of 145 feet are low enough to have potentially been affected by shoreline marine trangressions at times of Quaternary high sea level stands. Gold occurs on benches as well as the main drainage. Most of the gold is fine but some nuggets were present (Collier and others, 1908). Smith (1909) reports that one nugget worth $72 (1908) was recovered. The upper one foot of bedrock contributed to pay. Sainsbury (1972, p. 3) reports that cinnabar and some platinum-group metals are present in auriferous gravels of the Bluestone River.
Workings: Sainsbury and others (1969) mapped placer mining operations along 1.25 miles of the main drainage at surface elevations between 95 and 145 feet. Cobb and Sainsbury (1972) show another area of operations 0.5 miles north (downstream) of those mapped by Sainsbury and others (1969). Other locations of placer mining further upstream on Bluestone River are parts of tributary mining locations (Gold Run and Skookum Creeks; Sainsbury and others, 1969).
Production: Not known
Reserves: Not defined
Commodities (Major) - Au; (Minor) - Hg, platinum-group metals
Development Status: Yes
Deposit Model: Alluvial Au placer (Cox and Singer, 1986; model 39a)
3 entries listed. 3 valid minerals.
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Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p. Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resources map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000. Collier, A.J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p. Sainsbury, C.L., 1972, Geologic map of the Teller quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Map I-685, 4 p., 1 sheet, scale 1:250,000. Sainsbury, C.L., Kachadoorian, Reuben, Hudson, Travis, Smith, T.E., Richards, T.R., and Todd, W.E., 1969, Reconnaissance geologic maps and sample data, Teller A-1, A-2, A-3, B-1, B-2, B-3, C-1, and Bendeleben A-6, B-6, C-6, D-5, and D-6 quadrangles. Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 377, 49 p., 12 sheets, scale 1:63,360. Smith, P.S., 1909, Recent developments in southern Seward Peninsula: U.S. Geological Survey Bulletin 379-F, p. 267-301.