The Turn occurrence is located west of Turnagain Lake about 51 kilometres southeast of the community of Dease Lake.

The area is shown on Geological Survey of Canada Open File map 2779 as being covered by Quaternary sediments. West of the Turn showing, however, rocks consisting of Upper Permian to Upper Triassic Kutcho assemblage metavolcanics and Upper Triassic Sinwa Formation (Stuhini Group) limestone are mapped.

In 1983-84, the Turnagain Lake group of claims was staked by Noranda Exploration Company, Limited to cover airborne electromagnetic anomalies detected by Questor Surveys while under contract to Noranda. In 1984-85, control grids were established for the purposes of geological mapping, soil geochemistry, and geophysical (horizontal loop electromagnetics and magnetic) surveys. Noranda reported the exposure of chloritic schist, felsic schist, phyllite, limestone, and dolomite just west of Turnagain Lake. Minor galena was found in siliceous limestone in 1984.