Unnamed (northeast of Blunt Mountain)

Occurrences, Undetermined

Commodities and mineralogy

Main commodities Au; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale A-5
Latitude 55.151
Longitude -131.365
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents five occurrences northeast of Blunt Mountain. The occurrences are in sections 34 and 35, T. 77 S., R. 93 E., of the Copper River Meridian, and range from about 400 feet in elevation to sealevel, and about 1.2-1.7 miles northeast of the highest point on Blunt Mountain . The coordinates are for the approximate center of the approximately half-mile-square area that contains these occurrences. The site corresponds to locs. 8 and 9 in Berg (1972 [I 684]), loc. 142 in Elliott and others (1978), and locs. 27a-b and 28a-c in Karl (1992). The location is accurate within 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of these occurrences are recrystallized, Upper Triassic conglomerate and overlying rhyolite and felsic tuff (Berg, 1972). The rocks are complexly folded and faulted, and were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time.
The deposits consist of quartz fissure veins up to 30 feet thick and 100 feet long that contain clots of pyrite, galena, and chalcopyrite; and of sheared metarhyolite containing sparsely disseminated sphalerite, chalcopyrite, pyrite, and galena (Berg, 1972; Karl, 1992). Variously mineralized samples of veins and country rocks contained up to 0.34 ppm Au, 2.5 ppm Ag, and 0.5% Cu (Karl, 1992, locs. 27, 28) . Soil samples contained as much as 0.27 ppm Au, and detectable Ag.
Geologic map unit (-131.366682575296, 55.1506592259881)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c)
Age of mineralization The fissure veins probably are Late Cretaceous.

Production and reserves

Workings or exploration Variously mineralized samples of veins and country rocks contained up to 0.34 ppm Au, 2.5 ppm Ag, and 0.5% Cu (Karl, 1992, locs. 27, 28) . Soil samples contained as much as 0.27 ppm Au, and detectable Ag.
Indication of production None

References