A placer mining and exploration compilation of parts of the Watson Lake and Whitehorse mining districts, southern Yukon Territory, Canada. This compilation includes the location, history and previous work, description of bedrock geology, surficial geology and mineralization, as well as lists of related references. Accompanying this report are four 1::250 000-scale maps (Watson Lake, 105 A; Whitehorse, 105 D; Teslin, 105 C; and Wolf Lake, 105 B) which display the locations of the placer occurrences discussed in the report.