Powooiliak Point Occurrence, Bering Sea Mining District, Nome Census Area, Alaska, USAi

Regional Level Types
Powooiliak Point Occurrence	Occurrence
Bering Sea Mining District	Mining District
Nome Census Area	Census Area
Alaska	State
USA	Country

Berg and Cobb (1967, p. 9) report the presence of a 1/2 to 2 inch calcite vein containing pyrite, chalcopyrite, galena, pyrrhotite, and sphalerite in a small limestone outcrop at Cape Puguviliak (a former name for Poovooiliak Point, Cobb, 1980, p. 58). The source of this description is not identified. The mineralization described by Berg and Cobb (1967) may be in the nearby Triassic to Permian age mafic Permo-Triassic assemblage and a different occurrence than that described and sampled by Patton and Csejtey (1971).
Location: Poowooliak Point is on the southwest coast of St. Lawrence Island, 3 miles east of the mouth of the Okok River. The site is on a wave cut bench at the base of the sea cliff on the north side of Poowooliak Point. It is located within 1/4 mile and is locality 12 of Cobb (1972). Cobb (1980) summarized relevant references under the name 'Poowooliak Point'.
Geology: Pyrite and galena are present in irregular quartz veins cutting kaolinized limonite-stained lithic tuffs. The mineralization is exposed on a wave cut bench below sea cliffs, northwest of Poowooiliak Point. This is close to the mapped contact between a Triassic to Permian age mafic assemblage and Cretaceous volcanic rocks (Patton and Csejtey, 1980). The mineralization described by Patton and Csejtey (1971) is apparently in Cretaceous volcanic rocks. Berg and Cobb (1967, p. 9) report the presence of a 1/2 to 2 inch calcite vein containing pyrite, chalcopyrite, galena, pyrrhotite, and sphalerite in a small limestone outcrop at Cape Puguviliak (a former name for Poovooiliak Point, Cobb, 1980, p. 58). The source of this description is not identified. The mineralization described by Berg and Cobb (1967) may be in the nearby Triassic to Permian age mafic Permo-Triassic assemblage and a different occurrence than that described and sampled by Patton and Csejtey (1971).
Workings: None
Age: Cretaceous or Tertiary, the age of volcanic and related hypabyssal intrusive rocks on western St. Lawrence Island (Patton and Csejtey, 1980).
Alteration: The lithic tuff is kaolinized and cut by sulfide-bearing quartz veins.

Commodities (Major) - Pb
Development Status: None
Deposit Model: Polymetallic sulfide mineralization in altered volcanic rocks. Deposit model 22

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Link to USGS - Alaska:	SL014

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References