|Quadrangle map, 1:250,000-scale||SO|
|Quadrangle map, 1:63,360-scale||C-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||A limited amount of mining at unknown locations took place along Koyana Creek until about 1930. Koyana Creek is a small drainage that flows south to Norton Sound; the mouth of the creek is about 2.5 miles east of the old town of Bluff at the mouth of Daniels Creek. The location is accurate.|
Geologic descriptionSmall-scale placer mining took place on Koyana Creek in the early part of the 1900s (Collier, 1908) and between 1928 and 1930 (Cobb, 1978). The placer deposits were shallow and apparently low grade. Mulligan (1971) estimates that less than 100 ounces of gold were produced. Cinnabar was recovered in the placer concentrates (Cathcart, 1922). Bedrock in the area is a lower Paleozoic metasedimentary sequence that includes marble and schist (Till and others, 1986). As of early 2010, there has apparently not been any placer mining on Koryana Creek for decades but it is on a large block of ground that was being explored for its lode gold potential by Millrock Resources Inc. (2010). Much of the creek is only slightly above the present sea level and the placer deposits may have been reworked by Quaternary sea level fluctuations.
|Geologic map unit||(-163.673780217581, 64.5695631727602)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary. Much of the creek is only slightly above the present sea level and the placer deposits may have been reworked by Quaternary sea level fluctuations.|
|Workings or exploration||Small open-cut placer mining until about 1930. As of early 2010, there has apparently not been any placer mining on Koryana Creek for decades but it is on a large block of ground that was being explored for its lode gold potential by Millrock Resources Inc. (2010).|
|Indication of production||Yes; small|
|Production notes||Mulligan (1971) estimates that less than 100 ounces of gold were produced.|
Cathcart, S.H., 1922, Metalliferous lodes in southern Seward Peninsula: U.S. Geological Survey Bulletin 722-F, p. 163-261.
Cobb, E.H., 1972, Metallic mineral resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.
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.
Millrock Resources Inc., 2010, Bering Straits Native Corporation Lands: http://www.millrockresources.com/index.php/projects/bering_straits/ (as of Feb 10, 2010).
Mulligan, J.J., 1971, Sampling gold lode deposits, Bluff, Seward Peninsula, Alaska, with a section on petrography by Walter L. Gnagy: U.S. Bureau of Mines Report of Investigations 7555, 40 p.
Stevens, D.L., 2010, Bluff Gold prospect, Seward Peninsula, western Alaska: NI43-101 Technical Report for Millrock Resources Inc., 153 p. (posted on www.sedar.com on February 4, 2010).
|Reporters||Travis L. Hudson (Applied Geology); D.J. Grybeck (Contractor, U.S. Geological Survey)|
|Last report date||4/2/2010|