CHAPTER XVII.
MACKENZIE RIVER REGION.—Economic Minerals.
The Territory Has Never Been Thoroughly Examined for Minerals.—Tar Springs on the North Shore of Great Slave Lake.—The Devonian Rocks Throughout Mackenzie Valley are Nearly Everywhere More or Less Petroliferous.—Lignite Discovered in Many Places, Also Gypsum.—Large Deposits of Excellent Salt.—Indications of Gold and Copper.—Indians Report Finding Mica. 281