Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Zn
Gangue minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale SL
Quadrangle map, 1:63,360-scale C-5
Latitude 63.42
Longitude -171.21
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in the bed of an unnamed stream that flows southwest to its mouth at Poowooliak Bay on the southwest coast of St. Lawrence Island. The mouth of this stream is 4 miles northeast of Poowooliak Point. The site is about 1 1/2 miles upstream of the mouth, just inland of the coastal wavecut platform. It was not included by Cobb (1972, 1980).

Geologic setting

Geologic description

The occurrence is characterized as polymetallic sulfide mineralization in altered volcanic rocks. Silicified, fine-grained volcanic rock exposed in the streambed contains pyrite and one rock sample contained 700 ppm zinc (Patton and Csejtey, 1971, p. C8, C15).
Geologic map unit (-171.212754173193, 63.4190821142048)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c?).
Mineral deposit model number 22c?
Age of mineralization The volcanic rocks here are mapped as part of a mid-Cretaceous assemblage but the age of mineralization could be Cretaceous or Tertiary, the age of volcanic and related hypabyssal intrusive rocks on western St. Lawrence Island (Patton and Csejtey, 1980).
Alteration of deposit The volcanic rock here is silicified and pyrite-bearing.

Production and reserves

Workings or exploration A single rock sample contained 700 ppm zinc (Patton and Csejtey, 1971, p. C8, C15).
Indication of production None

References