Unnamed (west side of Canyon Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals azurite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.2728
Longitude -142.1874
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the west valley wall of Canyon Creek. It is at an elevation of about 4,000 feet, 6,000 feet northeast of elevation 6075 and 800 feet from Canyon Creek. The site is in the SE1/4 of section 9, T. 7 S., R. 18 E. of the Copper River Meridian. This is locality 36 of MacKevett (1976); the location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of secondary copper minerals (malachite and azurite?) in a 1- to 2-foot-thick mineralized zone that cuts Triassic Nikolai Greenstone (MacKevett and Smith, 1968, 1972; MacKevett, 1976). The mineralized zone is part of a 15-foot-wide fault zone (MacKevett and Smith, 1968, p. 3). A sample of the mineralization contained 50 parts per million (ppm) silver, 1.3 ppm gold, and more than 20,000 ppm copper (MacKevett and Smith, 1968, sample 108). Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Geologic map unit (-142.189432474774, 61.2723798966455)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).

Production and reserves

Workings or exploration Only limited surface sampling.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011689

References

Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003