Bulletin No. 263 
Series A, Economic Geology, 55 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT, Director 
METHODS AND COSTS 
OF 
GRAVEL AND PLACER MINING 
IN ALASKA 
BY 
CHESTER WELLS PURINGTON 
WASHINGTON 
GOVERNMENT PRINTING OFEICE 
1 9 05 
