Unnamed (west of upper Malamute Fork John River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb
Other commodities Sb; Zn
Ore minerals azurite; bornite; galena; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-5
Latitude 67.2773
Longitude -152.4743
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the top of hill 3836, in section 6, T. 28 N., R. 22 W., of the Fairbanks Meridian. The site corresponds to the location of sample no. 80 in Dillon and others (1981 [AOF 133B]). The location is accurate.

Geologic setting

Geologic description

This occurrence consists of a mineralized stockworks of quartz veins in dolomite (Dillon and others, 1981 [AOF 133B]). The rocks in the area are Devonian, Skajit Limestone, with subordinate metabasite (Dillon and others, 1986). The veins contain malachite, azurite, bornite(?), and galena. A sample of quartz near a contact with greenschist with 5% magnetite, contains up to 1,500 ppm copper, 1,000 ppm antimony, 240 ppm zinc, and no detectable lead.
Geologic map unit (-152.477045609417, 67.2768307331562)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c?).
Mineral deposit model number 22c?
Alteration of deposit Oxidation of copper mineral(s).

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

References