purington.] GRAVEL AND PLACER MINING. 35 
Methods of working alluvial gold deposits in Alaska — Continued. 
Class of placers. 
Method of working. 
Gravel-plain (tundra) 
placers. « 
Hydraulicking with hydraulic elevating. 
Open cutting, separate stripping, and shoveling in. 
Shaft, thawing, and drifting. 
Sea-beach placers b 
Digging shallow pits and shoveling in. c 
Dredging. 
Special devices. 
Lake-bed placers 
Hydraulicking. 
a Detritus from 15 to 150 feet in thickness. 
b Detritus from 1 to 6 feet in thickness. 
c The greater part of the gold from the beach sands has been obtained by rockers. 
The above classes are based on operations actually seen during the 
season of 1904. Suggestions concerning the application of other 
methods to certain forms of deposits are given in the body of the 
main report. 
In the districts visited the deposits under exploitation as above 
classified were as follows: 
Classes of deposits worked in districts visited. 
Province. 
District. 
Class of placer worked. 
South Coast 
Juneau 
Creek and lake-bed placers. 
Interior 
Atlin 
Creek and bench placers. 
Creek, hillside, and bench placers. 
Creek and bench placers. 
Creek, hillside, and river-bar placers. 
Creek placers. 
Klondike 
Eagle 
Birch Creek 
Fairbanks 
Seward Peninsula . . . 
Nome 
Council 
Creek, hillside, and bench, gravel-plain 
and sea-beach placers. 
Creek, hillside, and river-bar placers. 
Solomon 
Creek and river-bar placers. 
