Veleska-South

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Bi; Cd
Ore minerals chalcopyrite; galena; pyrite; pyrrhotite; sphalerite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-2
Latitude 62.349
Longitude -153.64
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Veleska-South occurrence is located in a steep canyon near the head of Tin Creek, about 300 feet (91 m) below the snout of an active rock glacier at an elevation of 3,300 feet (1,006 m) in the NE1/4 sec. 13, T. 26 N., R. 24 W., of the Seward Meridian. The occurrence is about 5 miles (8 km) south of Veleska Lake. The reporter investigated the Veleska-South occurrence in 1981.

Geologic setting

Geologic description

At the Veleska-South occurrence, thin, 0.5 to 1 inch thick seams and stockworks of pyrrhotite, pyrite, chalcopyrite and galena cut nearly flat lying, subaerial andesite and basalt flows of the Late Cretaceous (65 Ma) Veleska Lake volcanic field (Bundtzen, Kline, and Clough, 1982; Bundtzen, Harris, and Gilbert, 1997). Northwest-trending, porphyro-aphanitic, granodiorite dikes that cut the Late Cretaceous volcanics carry disseminated sulfides and may be genetically related to the stockwork mineralization. Nearby stream cobbles contain pyrrhotite with a trace of chalcopyrite and sphalerite. A major northeast trending, high angle fault that cuts the Dillinger subterrane and younger Veleska Lake volcanic field is juxtaposed against the western edge of the Veleska Lake occurrence; this structure may have developed a tensional environment suitable for sulfide stockwork formation.
Principle sulfide mineralization consists of massive pyrrhotite and pyrite, and disseminated galena and sphalerite, and a trace of chalcopyrite. Reed and Elliott (1968, C 586) reported that selected samples contained up to 2.00 percent lead, 1.00 percent zinc, and 0.15 percent copper. Bundtzen, Kline, and Clough (1982) reported that a grab sample of nearly massive pyrrhotite contained 0.05 percent copper, 0.47 percent lead, 0.55 percent zinc, and 0.21 ounces/ton silver. Smith and Albanese (1985) reported that a grab sample of sulfide-bearing mineralization near the Veleska-South occurrence contained 0.06 percent copper, 0.84 percent lead, 1.65 percent zinc, 0.40 ounces/ton silver, and 110 ppm cadmium.
Geologic map unit (-153.642224767364, 62.348391788008)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Metasomatic replacement (Ca).

Production and reserves

Workings or exploration Only surface sampling has been conducted at the Veleska-South occurrence. Reed and Elliott (1968, C 596) reported that selected samples contained up to 2.00 percent lead, 1.00 percent zinc, and 0.15 percent copper. Bundtzen, Kline, and Clough (1982) reported that a grab sample of nearly massive pyrrhotite contained 0.05 percent copper, 0.47 percent lead, 0.55 percent zinc, and 0.21 ounces/ton silver. Smith and Albanese (1985) reported that a grab sample sulfide-bearing mineralization near the Veleska South occurrence contained 0.06 percent copper, 0.84 percent lead, 1.65 percent zinc, 0.40 ounces/ton silver, and 110 ppm cadmium.
Indication of production None
Reserve estimates None.

References

MRDS Number A015031

References

Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 11/6/1998