Unnamed (south of Sealion Cove)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Au; Cu; Mo
Other commodities As
Ore minerals chalcopyrite; molybdenite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale B-6
Latitude 57.2851
Longitude -135.8345
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 100 feet in an unnamed cove about 0.4 mile south of the head of Sealion Cove on northwest Kruzof Island. The occurrence is 0.3 mile southwest of the center of sec. 11, T. 53 S., R. 60 E. It is location P-105 of Bittenbender and others (1999), location 49 of Cobb (1972, 1978), and MAS no. 0021140076 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.

Geologic setting

Geologic description

Loney and others (1975) map the rocks in the area of this occurrence as Jurassic and Cretaceous graywacke that is intruded by a stock of Tertiary (Eocene) granodiorite. The graywacke is widely metamorphosed by the intrusion to hornfels and schist.
Cobb (1972, 1978), citing Loney and others (1963), describes the occurrence as molybdenite and chalcopyrite in quartz veins in biotite hornfels associated with pegmatite dikes. Bittenbender and others (1999) describe the occurrence as a porphyry molybdenum-copper deposit; samples contained up to 2,450 parts per billion gold, 21 parts per million (ppm) molybdenum, 110 ppm copper, and more than 1 percent arsenic.
Geologic map unit (-135.836281019047, 57.2847261680348)
Mineral deposit model Polymetallic veins and/or porphyry Mo-Cu deposit (Cox and Singer, 1986; models 22c and 21a).
Mineral deposit model number 22c and/or 21a

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

References

References

Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004