The electoral district was abolished in 1996 when it was redistributed between Algoma, Kenora—Rainy River, Thunder Bay—Nipigon, Timiskaming—Cochrane and Timmins-James Bay ridings.

In Cochrane, it included the part of the district lying east of a line drawn along the eastern boundaries of the townships of McCoig and Mulloy and north to the northern limit of the district.

In Patricia, it included the part lying east of the projection north of the western boundary of the electoral district of Cochrane.

In the 1960s, it was redefined to consist of the northern parts of the territorial district of Algoma, Cochrane, Kenora (Patricia Portion), Sudbury and Timiskaming.

The electoral district was abolished in 1976 when it was redistributed between Algoma, Cochrane North, Timiskaming and Timmins—Chapleau ridings.