Unnamed (on Kosina Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold; magnetite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale C-2
Latitude 62.7309
Longitude -147.9573
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer prospect is at an elevation of about 2,200 feet on Kosina Creek below the junction with Gilbert Creek. The location is accurate to within 1/4 mile. This is locality B26 of Kurtak and others (1992). Also known as the Watana Rainbow prospect.

Geologic setting

Geologic description

This gold placer prospect is in alluvial gravel deposits that conceal a fault contact between Lower to Middle Jurassic amphibolite and Pennsylvanian(?) and Lower Permian basaltic and andesitic metavolcanic rocks (Csejtey and others, 1978). The gravel contains many large granitic boulders; this makes sampling and mining potentially difficult (Kurtak and others, 1992). Placer samples, which contain abundant magnetite, contain up to 0.0006 ounce of gold per cubic yard.
Geologic map unit (-147.959527180927, 62.7304351483545)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary placer.

Production and reserves

Workings or exploration Placer sampling by the U.S. Bureau of Mines (Kurtak and others, 1992).
Indication of production None

Additional comments

MAS/MILS number 20760047.