Unnamed (on tributary to Dalzell Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities As; Au
Other commodities Sb
Ore minerals arsenopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-1
Latitude 62.237
Longitude -153.257
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is located on a rugged north-facing spur of a tributary valley of Dalzell Creek at an elevation of 4,600 feet (1,402 m) in the SE1/4 sec. 24, T. 25 N., R. 22 W., of the Seward Meridian. The reporter sampled the site in 1988; at station no. 88BT177.

Geologic setting

Geologic description

This unnamed occurrence is a low sulfide-quartz vein that intrudes sandstone of the Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The vein strikes approximately N70E for a distance of about 110 meters, and averages about 0.5 meters wide. Disseminated arsenopyrite and pyrite comprise about 1 percent of the vein volume. One grab sample of the vein contained 1,600 ppm arsenic, 150 ppb gold, and 55 ppm antimony.
Geologic map unit (-153.25923519978, 62.236400290229)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit None.

Production and reserves

Workings or exploration The reporter investigated the site during a geological mapping program for the Alaska Division of Geological and Geophysical Surveys in 1988 (Bundtzen, Harris, and Gilbert, 1997). One grab sample of sulfide-bearing vein material contained 1,600 ppm arsenic, 150 ppb gold, and 55 ppm antimony.
Indication of production None
Reserve estimates None.

References