Azurite

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Pd
Ore minerals azurite; chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-5
Latitude 63.2619
Longitude -146.4071
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,750 feet in a north-flowing tributary to the East Fork Maclaren River and about 3 miles southwest of the terminus of the Eureka Glacier. The occurrence is in the SW1/4SE1/4 section 16, T. 18 S., R. 7 E., Fairbanks Meridian.

Geologic setting

Geologic description

The rock at this occurrence is metabasalt of the Nikolai Greenstone of Late Triassic age. This formation was mapped as the Amphitheater Basalt by Rose (1966 [ADMM GR 20]). At this locality a 30- by 50-foot area contains abundant copper-stained and pyrite-bearing basalt. Two samples from this site contain 578 and 697 parts per billion (ppb) gold, 31 and 69 parts per million silver, 31 and 108 ppb palladium, and 7.8 and 15.3 percent copper (W.T. Ellis, oral communication, 2001).
Geologic map unit (-146.409362480706, 63.2614721787802)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Cretaceous or younger.
Alteration of deposit Chlorite-epidote alteration of the volcanic host rock; local oxidation of copper minerals.

Production and reserves

Workings or exploration The occurrence is on active claims of MAN Resources. Two samples from this site contain contain 578 and 697 parts per billion (ppb) gold, 31 and 69 parts per million silver, 31 and 108 ppb palladium, and 7.8 and 15.3 percent copper (W.T. Ellis, oral communication, 2001).
Indication of production None

Additional comments

This is a copper occurrence typical of the Nikolai Greenstone.

References