The Williston Lake occurrence is located near the west side of Williston Lake, north of Ole Creek, about 77 kilometres north of the community of Germansen Landing.

At the showing, Neoproterozoic Ingenika Group rocks include micaceous strata (kyanite schist) in which abundant porphyroblasts of kyanite, more than 2 centimetres long, are present (Geological Survey of Canada Paper 75-33).