Unnamed (east of the toe of McCallum Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite; galena
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2845
Longitude -145.566
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 6,200 feet approximately 1 mile east of the toe of McCallum Glacier. It is in the SW1/4NW1/4 section 12, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 13), and it corresponds to locality 27 in Cobb (1979 [OFR 79-238]) and locality S118 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

This occurrence consists of chalcopyrite and galena in quartz veins as much as 6 inches thick that strike N60E and dip 40S (Hanson, 1963). The veins cut altered meta-andesite intruded by quartz diorite. A grab sample of iron-stained meta-andesite contained 3 parts per million silver (Nokleberg and others, 1991). The host rocks are part of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). This occurrence is one of the four prominent areas of pyrite and chalcopyrite disseminated in dacitic tuff noted by Hanson (1963, p. 67, figure 5).
Geologic map unit (-145.568244137515, 63.2840885170283)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Pennsylvanian or younger.
Alteration of deposit The meta-andesite is highly altered adjacent to the quartz diorite intrusion (Hanson, 1963).

Production and reserves

Workings or exploration A grab sample of iron-stained meta-andesite contained 3 parts per million silver (Nokleberg and others, 1991).
Indication of production None

References