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Sixtymile Butte

Prospect, Active

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Commodities and mineralogy

Main commodities Au
Other commodities Ag

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale C-5
Latitude 63.58
Longitude -143.12
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Sixtymile Butte prospect is a large area of about 12 square miles located within T. 20-21 N., R. 12-13 E., Tanacross (C-5) and (C-6) quadrangles, covering much of Sixtymile Butte. There are two centers of prospecting activity: one in the SE1/4 section 20, T. 21 N., R. 12 E., of the Copper River Meridian and the other in the SE 1/4 section 29, T. 21 N., R. 13 E., of the Copper River Meridian. The coordinates given are for the first location. The locations are accurate to within 1 to 2 miles.

Geologic setting

Geologic description

The Sixtymile Butte area is dominated by mid-Cretaceous lavas, welded tuffs, tuff breccias and volcanic agglomerates (Foster, 1970). These rocks were mapped as Tertiary, but recent work suggests that they are Cretaceous (Doyon Ltd., 1998). The volcanics range in composition from andesitic to dacitic and have volcanic-arc-type, minor-element abundances (Bacon and others, 1990). Stream-silt sampling revealed three drainages with anomalous gold values (Doyon Ltd., 1998).
Geologic map unit (-143.122252719332, 63.5796521054896)
Mineral deposit model Epithermal Au-Ag?
Age of mineralization The volcanic complex probably is mid-Cretaceous (Doyon, 1998).

Production and reserves

Workings or exploration In 1975, WGM Inc. conducted a base-metal reconnaissance program. In 1981, Arctic Resources Inc. did a soils traverse, and in 1985 Doyon Ltd. resubmitted the samples for Au pathfinders. In 1990, Doyon Ltd. sampled stream sediments for gold.
Indication of production None

Additional comments

This property is located on Doyon conveyed land. For more information, contact Doyon Ltd.

References

MRDS Number 10308380

References

Bacon, C.R., Foster, H.L., and Smith, J.G., 1990, Rhyolitic calderas of the Yukon-Tanana terrane, east-central Alaska--Volcanic remains of a mid-Cretaceous magmatic arc: Journal of Geophysical Research, v. 95, p. 21,451-21,461.
Doyon, Limited, 1998, Veta Prospects 1997 Volume 1: Doyon, Limited, unpublished report 98-10, 256 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-593, 1 sheet, scale 1:250,000.
Reporters C.E. Cameron (ADGGS)
Last report date 4/13/1999