82 



FIG. 60. Dredges on No. 104 below, on Bonanza Creek, Yukon Territory, 

 Hydraulic plant in operation on hill in the distance. (After D. D. Cairnes, 

 Canadian Geological Survey.) 



F IG 61. The Dome mill, Porcupine district, Ontario, for cyaniding 

 gold. Showing inclined conveyor. 



