The Atlin Road occurrence is located near the east shore of Atlin Lake, about 46 kilometres north of the community of Atlin.

Middle Jurassic Three Sisters Plutonic Suite granitic intrusions form the dominant rock type along the northeast side of Atlin Lake. Immediately south of the Yukon border and east of the Atlin Road, high magnesian limestones of the Upper Mississippian to Permian Horsefeed Formation (Cache Creek Complex) have been thermally metamorphosed at their contact with granite. Brucitic marble is associated with the contact metamorphic zone.