Koyana Creek

Mine, Active

Commodities and mineralogy

Main commodities Au
Other commodities Hg
Ore minerals cinnabar; gold

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale C-4
Latitude 64.5703
Longitude -163.6712
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 setting

Geologic description

Small-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.

Production and reserves

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
Reserve estimates None.
Production notes Mulligan (1971) estimates that less than 100 ounces of gold were produced.

References