Upper Nugget Creek

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Other commodities As
Ore minerals arsenopyrite; gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale C-2
Latitude 62.561
Longitude -150.982
Nearby scientific data Find additional scientific data near this location
Location and accuracy C.C. Hawley and Associates, Inc. (1978, Fig. 4.2-(3)) show this lode claim group covering most of the headwater basin of the south fork of upper Nugget Creek in the southwest quarter of Section 33, T. 29 N., R. 9 W., of the Seward Meridian.

Geologic setting

Geologic description

Upper Nugget Creek drains an area underlain by Mesozoic argillite and graywacke cut by a roughly circular, Tertiary (?) felsite porphyry body about 200 feet in diameter (Clark and Hawley,1968). Minor gold values have been returned from thin, sparsely distributed quartz-arsenopyrite veinlets which cut the porphyry. The veinlets are weakly mineralized at about 0.04 ppm gpld. Gold also occurs very sparsely on the joint surfaces of the rocks (Clark and Hawley, 1968).
See also Bradley Scheelite; Bird Creek (TL036).
Geologic map unit (-150.98428866741, 62.5604777764001)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Tertiary (Clark and Hawley, 1968).
Alteration of deposit Silicification (quartz veining) (Clark and Hawley,1968).

Production and reserves

Workings or exploration Workings consist of two short adits and a shallow prospect pit (Clark and Hawley, 1968).
Indication of production None

Additional comments

Also see Bradley Scheelite; Bird Creek (TL036).

References

MRDS Number A011555

References

Reporters Madelyn A. Millholland (Millholland & Associates)
Last report date 8/10/1998