Whirlwind

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Pb
Other commodities As; Cu
Ore minerals arsenopyrite; galena
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale C-3
Latitude 63.504
Longitude -154.231
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Whirlwind prospect is situated at the southwest end of Whirlwind Ridge at an elevation of 2,700 feet (823 m) in Section 9, T. 23 S., R. 24 E., of the Kateel River Meridian. Location is accurate to within about 1,000 feet (304 m).

Geologic setting

Geologic description

The Whirlwind prospect consists of veinlets and replacement zones near the contact of a composite pluton with Cretaceous flysch. The composite pluton, which is composed of pyroxenite, gabbro, and monzonite, is elongated parallel to the northeast trending ridgeline (Patton and others, 1980). Galena and arsenopyrite occur in replacement zones at the contact and as grains in mafic phases of the pluton. The pluton is marked by an elongated aeromagnetic high (Patton and others, 1982). The Whirlwind prospect is inferred to be Late Cretaceous, based on isotopic ages of the host pluton (Moll and others, 1981). Grab samples collected by DiMarchi and others (1992) contain as much as 276 ppm copper, 1.4 ppm silver, 396 ppm lead, and 6,192 ppm arsenic.
Geologic map unit (-154.233338140923, 63.5034085100343)
Mineral deposit model Polymetallic veins (Cox and singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The Whirlwind prospect is inferred to be Late Cretaceous, based on isotopic ages of the host pluton (Moll and others, 1981).

Production and reserves

Workings or exploration The Whirlwind Prospect was discovered in 1991 by ASA Inc. during regional exploration on lands selected by Doyon Ltd. Grab samples collected by DiMarchi and others (1992) contain as much as 276 ppm copper, 1.4 ppm silver, 396 ppm lead, and 6,192 ppm arsenic.
Indication of production None
Reserve estimates None.

Additional comments

The Whirlwind prospect is on lands selected or owned by Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

References

References

Reporters Bundtzen, T.K. (Pacific Rim Geological Consulting)
Last report date 6/6/1998