Unnamed (north of Humpback Lake)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Cu; Mo
Ore minerals bornite; chalcopyrite; magnetite; molybdenite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale A-2
Latitude 55.069
Longitude -130.512
Nearby scientific data Find additional scientific data near this location
Location and accuracy The approximate location of this prospect is at an elevation of about 1500 feet, about 2.4 miles north-northwest of the east end of Humpback Lake. The site is in section 33, T. 78 S., R. 99 E., of the Copper River Meridian. It corresponds to loc. 108 in Elliott and others (1978), who refer to it as 'Red River.' The location is accurate within 0.2 mile.

Geologic setting

Geologic description

The country rocks in the general area of this prospect include Tertiary or Cretaceous foliated granodiorite and quartz diorite of the Coast Range batholith, and pelitic paragneiss that forms roof pendants and screens in the batholith (Berg and others, 1988). The paragneiss represents marine sedimentary strata that were regionally metamorphosed to amphibolite grade in Cretaceous or Tertiary time. The premetamorphic age of the paragneiss is uncertain, but they probably are mainly Paleozoic and may be as old as Precambrian (Berg and others, 1988, p. 26; Gehrels and others, 1990; Crawford and others, 2000).
According to Elliott and others (1978), who attribute their information to an oral communication from Kenneth Eichner, the property owner at that time, the deposit consists of pyrite, chalcopyrite, pyrrhotite, magnetite, bornite, and molybdenite that occur as scattered grains along gneissic bands in pelitic paragneiss. The metamorphic rocks presumably are part of a roof pendant in the Coast Range batholith. The mineralized bands range from an inch or so to about 100 feet thick. The deposit has been drilled by private interests, but the results of that exploration have not been made public.
Geologic map unit (-130.513681508594, 55.0686632344617)
Mineral deposit model Metamorphosed Besshi massive sulfide? (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b?

Production and reserves

Workings or exploration The deposit has been drilled by private interests, but the results of that exploration have not been made public.
Indication of production None

Additional comments

The site is in Misty Fiords National Monument Wilderness.

References