Unnamed (on west side of lower Duncan Canal)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities As; Au; Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale C-4
Latitude 56.565
Longitude -133.1014
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in a borrow pit near sea level on the west side of Duncan Canal opposite the mouth of the creek that drains Harvey Lake on Woewodski Island. It is near the southwest corner of section 21, T. 61 S., R. 79 E. The location is accurate.

Geologic setting

Geologic description

This occurrence was found during the exploration of the Duncan Canal area by Amoco Minerals Co. in the late 1970s. Still and others (2002) visited the site and collected several samples of greenstone that contained disseminated pyrite and chalcopyrite. The samples contained 15 to 821 parts per billion gold, 954 to 1,189 parts per million (ppm) copper, and 21 to 1,906 ppm arsenic. The rocks in the area are part of the Triassic Hyd Group which are known to be favorable for volcanogenic massive sulfide deposits in the Duncan Canal area (Karl and others, 1999).
Geologic map unit (-133.103125581948, 56.5646559132971)
Mineral deposit model Volcanogenic massive sulfide deposit?
Age of mineralization Triassic based on the age of the host rocks.

Production and reserves

Workings or exploration First located in the late 1970s; only limited surface sampling by government and industry.
Indication of production None

References

References

Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002, Mineral assessment of the Stikine area, central Southeast Alaska: U.S. Bureau of Land Management Technical Report 51, 560 p.
Reporters D.J. Grybeck (Port Ludlow, WA)
Last report date 4/8/2007