Unnamed (south shore of Walker Cove)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale C-3
Latitude 55.713
Longitude -130.867
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the south shore of Walker Cove about 1.2 miles east of Hut Point. The site is in section 16, T. 71 S., R. 95 E., of the Copper River Meridian. It corresponds to site G-9 in Berg and others (1977, p. 135), and to loc. 25 in Elliott and others (1978). The location is accurate within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of this occurrence consist of paragneiss metamorphic roof pendants, screens, and inclusions in Tertiary or Cretaceous foliated granodiorite and quartz diorite of the Coast Range batholith (Berg and others, 1988). The metamorphic rocks represent marine strata that underwent high-grade regional metamorphism in Cretaceous or Tertiary time. The premetamorphic age of the strata is uncertain, but they probably are mainly Paleozoic and may be as old as Precambrian (Berg and others, 1988, p. 26; Gehrels and others, 1990; Crawford and others, 2000).
The occurrence consists of sulfide-bearing paragneiss (Berg and others, 1977, p. 135). The sulfides occur as thin, discontinuous layers of pyrite and sparse chalcopyrite that parallel the foliation of the paragneiss. Anomalous amounts of Cu (280 ppm) and Ag (1.5 ppm) were detected in a grab sample from this locality. A chip sample across a 38-foot section of dark gray paragneiss containing bands of light gray, slightly pyritic paragneiss assayed 1000 ppm Cu and nearly 1 ppm Ag.
Geologic map unit (-130.868704915638, 55.7126551969809)
Mineral deposit model Disseminated base-metal sulfides in paragneiss

Production and reserves

Workings or exploration Anomalous amounts of Cu (280 ppm) and Ag (1.5 ppm) were detected in a grab sample of pyritic paragneiss from this locality (Berg and others, 1977, p. 135). A chip sample across a 38-foot section of dark gray paragneiss containing bands of light gray, slightly pyritic paragneiss assayed 1000 ppm Cu and nearly 1 ppm Ag.
Indication of production None

Additional comments

This site is in Misty Fiords National Monument Wilderness.

References