Gertrude Mine

The Lake Superior Power Corporation, owned by Francis Hector Clergue, needed cheap sulphur for his paper mill in Sault Sainte Marie. After failed negotiations with the Canadian Copper Company (later renamed INCO) for a steady supply of sulphur, Clergue then settled for purchasing mining properties to the west of the Murray Mine.

As with the Helen Mine in northern Algoma, the Elsie and Gertrude mines were both renamed to honour Clergue's sisters. The Gertrude had been a producing nickel mine since 1892 and its ores contained a large amount of sulphur.