Unnamed (south tributary to Black River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals garnet

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-2
Latitude 62.3314
Longitude -147.9082
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer occurrence is at an elevation of about 5,000 feet on an unnamed, north-flowing tributary of Black River, about 4 1/2 miles south of Black Lake. The placer is at the creek junction in the NE1/4 sec. 23, T. 26 N., R. 8 E., Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of placer gold and abundant garnet in pan concentrate samples from 2 forks at a stream junction (Clautice and others, 1990). A sample on the east fork contains 4,800 parts per billion gold, and at least 5 colors in the pan; a sample from the west fork contains more than 10,000 parts per billion ppb gold (or about 0.302 ounce of gold per ton) and abundant visible gold. The bedrock is Tertiary conglomerate cemented by limonite and hematite. A sample of the conglomerate did not contain anomalous metal values.
Geologic map unit (-147.910389386919, 62.3309296253232)
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 Only limited sampling (Clautice and others, 1990).
Indication of production None