Specimen Creek

Mine, Active

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Ni; Zn
Ore minerals gold; malachite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-5
Latitude 63.3113
Longitude -146.0425
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Specimen Creek placer mine is at an elevation of about 4,000 feet in the upper part of Specimen Creek. The location is approximate but is probably about 1,800 feet west of the center of section 33, T. 18 S., R. 9 E., Fairbanks Meridian.

Geologic setting

Geologic description

The course of upper Specimen Creek is apparently controlled by a steep fault that strikes north-northeast and that separates mafic-ultramafic rocks of the Upper Triassic Eureka ultramafic complex on the east from Pennsylvanian and Permian strata to the west (Rose, 1965, figure 2; Nokleberg and others, 1991).
The placer mine is marked by remnants of sluice boxes; it probably was worked on a small scale. The source of the gold is uncertain; Rose (1965) suggested that it may include pyritic rocks (his group A), ultramafic rocks, and high gravels. Rose (1965, locality 14, figure 2) noted copper-stained areas in metavolcanic rocks on the west bank of Specimen Creek. His stream-sediment samples 220 and 223 were anomalous in copper, zinc, and nickel.
Geologic map unit (-146.044762104982, 63.3108804415912)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration
Several placer claims and remnants of sluices were found on the upper part of Specimen Creek (Rose, 1965).
The occurrence is on active Online Exploration claims.
Indication of production Undetermined

References