Unnamed (along the Haines Highway)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au; Zn
Other commodities Cu
Ore minerals chalcopyrite; malachite; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-3
Latitude 59.35
Longitude -135.76
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is along the Haines Highway between mileposts 15 and 16. It is about 5.8 miles southeast of the village of Klukwan. It is shown as sample sites 790 and 791 on sheet 2 of Gilbert and others (1991).

Geologic setting

Geologic description

Gilbert and others (1991) collected several samples of quartz veins in metabasalt at this site that contained chalcopyrite, pyrite, malachite, and sphalerite. The samples contained up to 0.686 ppm gold, 2.4 ppm silver, 3,990 ppm copper, and 1.85% zinc. According to MacKevett and others (1974), the metabasalts exhibit a gradational contact with the Klukwan ultramafic complex and they considered both to be of Cretaceous age. Later workers (Plafker, Hudson and Silberling, 1979; Plafker and Hudson, 1980) assign a Late Triassic age to the metabasalts based on fossil evidence from the Chilkat Peninsula. Gilbert and others (1987) accept the Late Triassic age for the metabasalt and comment that it is juxtaposed against the plutonic rocks, including the Klukwan complex, to the east by the Tukgahgo Mountain fault, which strikes northwest and dips steeply. The veins and their settings appear similar to those at the Road Cut prospect (SK006) and unnamed occurrences (SK001, SK003) to the southeast. The Late Triassic age of the host rocks establishes a maximum age for the veins.
Geologic map unit (-135.761839950476, 59.3496724312573)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Late Triassic or younger based on the age of host rocks (Gilbert and others, 1987).

Production and reserves

Indication of production None

Additional comments

These occurrences are on the eastern edge of the Alaska, Chilkat Bald Eagle Preserve.

References

MRDS Number 10308245

References

Plafker, George, and Hudson, T., 1980, Regional implications of Upper Triassic metavolcanic and metasedimentary rocks on the Chilkat Peninsula, southeastern Alaska: Canadian Journal of Earth Sciences, v. 17, p. 681-689.
Reporters T.C. Crafford (T. Crafford & Associates, Anchorage)
Last report date 2/4/2001