SMITHSONIAN EXPLORATION IN ALASKA 



Photo, by Collier. 



I. Ground sluicing a deposit of flood-plain ice on a placer mining claim on 

 "the Seward Peninsula. Alaska. Such ice masses overlain by humus and soil 

 are called " "lacicrs " bv the miners. 



Photo, by Hess. 



2. Bar ice on the Yukon River in June overlain by gravels deposited by the 

 flood of the spring break-up. 



