Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale B-6
Latitude 62.308
Longitude -152.628
Nearby scientific data Find additional scientific data near this location
Location and accuracy Reed and others (1978, locality 34) locate this occurrence on a tributary to the Kichatna River, in the northwest quarter of Section 33, T. 26 N., R. 18 W., of the Seward Meridian, at about 4100 feet within the Denali National Park and Preserve.

Geologic setting

Geologic description

Disseminations of chalcopyrite, pyrite, pyrrhotite and other sulfides occur in narrow mineralized fracture fillings within the Kichatna stock, a composite stock of primarily olive-bearing pyroxene quartz monzonite (Reed and Nelson, 1980).
The Kichatna stock is one of the nine composite plutons (Tcp) within a 65-km-long belt described by Reed and Nelson (1980), that extends from Mt. Estelle in the southwest to Cascade Creek in the northeast. These Late Cretaceous/early Tertiary composite plutons intrude Mesozoic marine sedimentary rocks (KJs) and at one locale, in the upper West Fork of the Yentna River, crosscut the fault boundary between the Mesozoic strata and Paleozoic rocks, Pzus of Reed and Nelson (1980). Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).
Also see TL020, TL023, TL052, and TL053.
Geologic map unit (-152.630242366683, 62.3074267549216)
Mineral deposit model This occurrence does not specifically fit any of those defined by Cox and Singer (1986). It may be a variation of the Porphyry copper model (Cox and Singer, 1986; model 17?).
Mineral deposit model number 17?
Age of mineralization Late Cretaceous/early Tertiary; mineralization is interpreted to be linked to the Kichatna stock, one of the Tertiary composite plutons mapped by Reed and Nelson (1980).

Production and reserves

Workings or exploration Reconnaissance mapping, stream silt and rock sampling are all that have been done here. Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).
Indication of production None

Additional comments

This occurrence is located within the Denali National Park and Preserve.

References

MRDS Number A011541

References

Reporters Madelyn A. Millholland (Millholland & Associates)
Last report date 8/10/1998