Prospect, Inactive

Commodities and mineralogy

Main commodities Sb
Other commodities As; Cu
Ore minerals stibnite; tennantite or tetrahedrite

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale A-3
Latitude 63.1726
Longitude -151.2441
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Stibner prospect is near the head of Birch Creek, which is the northerly-flowing creek west of Slippery Creek and east of the Foraker River. Its location is poorly known; for this record, it is based on Moffit's statement (1933, p. 314) that the claim is 'on the Birch Creek side of the top of the ridge west of the small glacier' which lies west of the Merinser prospect (MM174). The prospect is number 27 of Cobb (1972 [MF-366]; 1980 [OFR 80-363]) and 37 of MacKevett and Holloway (1977). The location for this record is about 1.5 miles north of Cobb's location, and close to the one given for the Stibner by Heiner and Porter (1972, number 36). The prospect is probably in the NW1/4 sec. 20, T. 20 S., R. 19 W., Fairbanks Meridian. The location is probably accurate within a mile.

Geologic setting

Geologic description

The prospect is probably within the narrow band of mainly sedimentary rocks mapped by Moffit (1933, plate 4) north of the granitic massif now called the McGonagall pluton. Veins of stibnite and tennantite or possibly tetrahedrite cut basic igneous rocks similar to those which crop out on the Merinser claim (MM174). The veins are in a fault zone that strikes N. 20 E. (Moffit, 1933, p. 314). The veins are inferred to be of Oligocene age, somewhat younger than the McGonagall pluton of Late Eocene or Early Oligocene age (Reed and Lanphere, 1973, 1974; Cole, 1998).
The deposit is probably related geologically to the Straightaway Glacier (MM176) and Merinser (MM174) deposits. It is in a mineral belt that extends for six or more miles along the north flank of the Alaska Range.
Geologic map unit (-151.246356759574, 63.1720762931472)
Mineral deposit model Simple antimony lode (Cox and Singer, 1986; model 27d).
Mineral deposit model number 27d
Age of mineralization The age is inferred to be Oligocene based on proximity to the McGonagall pluton of Late Eocene or Early Oligocene age (Reed and Lanphere, 1973 and 1974; Cole, 1998).

Production and reserves

Workings or exploration The details of the workings are unknown. The prospect was discovered in about 1930 by W. J. Shannon, who located one claim at the site (Heiner and Porter, 1972, Mt. McKinley quadrangle, serial number 36). The claim was relocated by Arley Taylor in 1970.
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.


MRDS Number A011253


Cole, R. B., 1998, Early Tertiary post-subduction volcanism and deformation along the north side of the McKinley fault, Alaska [abs]: Geological Society of America. Abstracts with program, v. 30, p. 177.
Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p.
Reed, B.L., and Lanphere, M.A., 1973, Alaska-Aleutian Range batholith--Geochronology, chemistry, and relation to circum-Pacific plutonism: Geological Society of America Bulletin, v. 84, no. 8, p. 2583-2610.
Reed, B.L., and Lanphere, M.A., 1974, Offset plutons and history of movement along the McKinley segment of the Denali fault system, Alaska: Geological Society of America Bulletin, v. 85, p. 1883-1892.
Reporters C.C. Hawley
Last report date 12/12/2000