Great Slave Lake

In Northern Canada. Area 10,719 square miles. Discovered by Samuel Hearne ( q.v. ), in 1771. A post built there, 1786, by Leroux and Grant, of the North West Company. Three years later Alexander Mackenzie pa ed through the lake on his way to the mouth of the Mackenzie River. Visited later by many other explorers and fur traders, this being on the route to the far North and North-West. Index : MS Discovered by Samuel Hearne, 3, 31; Leroux builds post on, 18; Mackenzie on, 35, 36, 48, 49; forts on, 54-55. Bib. : Hearne, Journey to Copper mine ; Mackenzie, Voyages ; Burpee, Search for the Western Sea .