Abstract: In 1966, a conspicuous orange red gossan south of Hart River in the Wernecke Mountains was prospected and staked. The gossan is developed over a stratiform massive sulphide body of Proterozoic age. The massive sulphide body is completely enclosed in black argillite of the Gillespie Lake Group. It has the shape of a vertical to moderately dipping southward facing tabular pod and has been traced from an elevation of 4,150 feet to 3,700 feet.

Pyrite and pyrrhotite are the most common sulphide minerals and along with minor amounts of sphalerite, chalcopyrite, galena and rare tetrahedrite, form about 90% of the massive sulphide.The deposit is interepreted to be synsedimentary with proximal exhalative features.

Exploration work was conducted for several years up until 1971. By this time a deposit of 0.5 to 0.6 million tons grading 0.04 oz/ton Au, 1.45 oz/ton Ag, 1.45% Cu, 0.87% Pb and 3.65% Zn had been proven.

Authors: Morin, J.A.

Map Scale: 1 : 0

Citation: Morin, J.A., 1979. A preliminary report on Hart River (116 A/10) - A Proterozoic massive sulphide deposit. In: Mineral Industry Report 1977, J.A. Morin, M. Marchand, D.B. Craig, and R.L. Debicki (eds), Indian and Northern Affairs, Northern Affairs Program, Yukon, Geology Section, p. 22-24.