Kangik River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals native copper

Geographic location

Quadrangle map, 1:250,000-scale SL
Quadrangle map, 1:63,360-scale C-6
Latitude 63.57
Longitude -171.72
Nearby scientific data Find additional scientific data near this location
Location and accuracy Kangik River flows northeast into Aghnaghak Lagoon on the northwest coast of St. Lawrence Island. This site is in hornfels peripheral to the east side of the Sevuokuk pluton, 4.5 miles northeast of Vngyat Point' (Patton and Csejtey, 1971, p. C15). The site, probably located within 0.5 miles, is apparently on the Kangik River. This is locality 2 of Cobb (1972) and Cobb (1980) summarized relevant references under the name 'Kangik R.'.

Geologic setting

Geologic description

A small amount of native copper was found in float of a mafic volcanic hornfels 4 1/2 miles northeast of Vngyat Point (Patton and Cjestey, 1971, p. C15).
The hornfels is apparently in the east contact zone of the Sevuokuk pluton. The Sevuokuk pluton is an elongate and composite intrusion that makes up the western coastal headlands of St. Lawrence Island (Patton and Csejtey, 1980). It includes biotite hornblende quartz monzonite and biotite quartz monzonite phases (Csejtey, Patton, and Miller, 1971). The copper-bearing hornfels occurrence is apparently in the contact zone of a biotite hornblende quartz monzonite phase where it intrudes a Cretaceous volcanic assemblage of diverse lithologies and compositions. One K/Ar age determination for the Sevuokuk pluton gave an age of 108 +/- 3.2 Ma (Patton and Csejtey, 1980).
Geologic map unit (-171.722794213374, 63.5690695099313)
Mineral deposit model Copper-bearing replacements in hornfels.
Age of mineralization Mid-Cretaceous, the age of the Sevuokuk pluton (108 +/- 3.2 Ma; Patton and Csejtey, 1980)
Alteration of deposit The Cretaceous volcanic assemblage is thermally metamorphosed to hornblende hornfels and albite-epidote hornfels facies where it is in contact with granitic rocks but elsewhere it is commonly propylitically altered (Patton and Csejtey, 1980).

Production and reserves

Workings or exploration None
Indication of production None