Gold Run

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals placer gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale B-7
Latitude 61.4067
Longitude -158.48028
Nearby scientific data Find additional scientific data near this location
Location and accuracy About 1 mile of Gold Run, a tributary of the Holokuk River, has been prospected for gold. The coordinates are at about the midpoint of this work. The prospect is at an elevation of about 450 feet in the SW1/4, sec. 8, T. 15 N., R. 51 W., of the Seward Meridian. The occurrence is locality 33 of Miller and others (1989).

Geologic setting

Geologic description

Cady and others (1955) cite reports of placer gold prospects on Gold Run Creek. Morris Hofseth (oral communication, 1991) found a 5 ounce gold-quartz nugget while prospecting Gold Run in 1954. T.K. Bundtzen and M.L. Miller (unpublished data, 1999) have mapped an extensive felsic dike and sill swarm that cuts the Upper Cretaceous, Kuskokwim Group in the basin of Gold Run. Miller and others (2002) report that the nearby Buckstock pluton has a U-Pb age of 59.5 Ma. Similar igneous rocks are the sources of placer gold elsewhere in the Kuskokwim mineral belt (Bundtzen and Miller, 1997). Gray, Motooka, and Theodorakos (1997) reported that panned concentrate samples from Gold Run contained visible grains of gold and stibnite, and up to 20 percent scheelite.
Geologic map unit (-158.482637199182, 61.4059886027302)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Unknown, but probably Quaternary.

Production and reserves

Workings or exploration There was surface sampling and prospecting here before 1951, during 1954, and from 1992 to 1994 (Miller and others, 2002). Gray, Motooka, and Theodorakos (1997) reported that panned-concentrate samples from Gold Run contained visible grains of gold and stibnite and up to 20 percent scheelite.
Indication of production None
Production notes Morris Hofseth (oral communication, 1991) found a 5 ounce gold-quartz nugget on Gold Run in 1954.

References

MRDS Number A106159

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Miller, M.L., Bradley, D.C., Bundtzen, T.K., and McClelland, William, 2002, Late Cretaceous through Cenozoic strike-slip tectonics of southwestern Alaska: Journal of Geology, vol.110, p. 247-270.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date 5/6/2003