Sixtymile Butte

Prospect in Alaska, United States with commodities Gold, Silver

Geologic information

Identification information

Deposit ID 10308380
Record type Site
Current site name Sixtymile Butte

Geographic coordinates

Geographic coordinates: -143.12267, 63.57972 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Gold Primary
Silver Secondary

Nearby scientific data

(1) -143.12267, 63.57972

Comments on the geologic information

  • 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).
  • Age = the volcanic complex probably is mid-Cretaceous (Doyon, 1998).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Fortymile

Comments on the workings information

  • Workings / 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF TC031

Bibliographic references

  • Deposit

    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.

  • Deposit

    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. 339.

  • Deposit

    Doyon, Limited, 1998, Veta Prospects 1997 Volume 1: Fairbanks, Alaska, Doyon, Limited., unpublished report 98-10, 256 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)

Comments on the references

  • Primary Reference = Doyon Ltd., 1998

General comments

Subject category Comment text
Deposit Model Name = Epithermal Au-Ag?
Deposit Other Comments = This property is located on Doyon conveyed land. For more information, contact Doyon Ltd.

Reporter information

Type Date Name Affiliation Comment
Reporter 13-APR-99 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys