Unnamed (along and at head of Thompson Pup)

Occurrences, Undetermined

Commodities and mineralogy

Main commodities Au
Other commodities Ag; As; Cu; Sb
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite; stibnite
Gangue minerals limonite; quartz; siderite

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-1
Latitude 67.4956
Longitude -150.1669
Nearby scientific data Find additional scientific data near this location
Location and accuracy These occurrences are along and at the head of Thompson Pup, a tributary of Fay Creek (WI112). They are in the southwest quarter of section 23, T. 31 N, R. 12W. The location is accurate. (See WI124 for placer gold in Thompson Pup.)

Geologic setting

Geologic description

Quartz veins with gold have been identified at several locations along and at the head of Thompson Pup. Brosge and Reiser (1972) found a quartz vein at the head of Thompson Pup that averaged 3.4 parts per million (ppm) gold. Kurtak and others (2002) collected a series of 8 samples (presumably along Thompson Pup) from veins 0.5 inch to 2 feet thick that averaged 56 parts per billion (ppb) gold; the highest value was 182 ppb gold. The veins trend N70W and contain sparse pyrite, chalcopyrite, arsenopyrite, and stibnite. Sluice concentrates from placer mining include many arsenopyrite crystals up to 1 centimeter in size. A sample of these crystals contained 1,964 ppb gold. The rocks in the area are mostly Devonian micaceous schist, phyllite, and metasiltstone (Eden, 2000).
Geologic map unit (-150.169650855578, 67.4951753210709)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Devonian or younger based on the age of the host rock.
Alteration of deposit None mentioned.

Production and reserves

Workings or exploration Limited surface sampling by government agencies (Brosge and Reiser, 1972; Kurtak and others, 2002).
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Reporters J.M. Britton (Anchorage); D.J. Grybeck (Contractor, USGS)
Last report date 2/1/2011