240 University Geological Survey of Kansas. 
in a break in the launder. Through this screen the water 
can pass, but the tailings, not being able to pass through, fall 
to the ground. SBy this means, the tailings pile may be built 
at any point along the sluiceway or launder, or may be shifted 
from one point to the other as the pile increases in height. 
The launder is often lined with a special form of cast iron 
trough. This iron lining or spouting comes in three or four 
foot lengths and any width up to eight and ten inches, and 
averaging about 2% to 3 inches in depth. 
Tue Interior Ev_evators.—The mill or interior elevators 
do not need to be so strongly built as the tailings elevators. 
They are usually from 12 to 16 feet high and from 6x8 to 
8x10 feet in plan, although the size varies with the capacity 
of the mill and the location of the elevator. 
The elevator belt is driven by the top pulley, which is con- 
nected directly to the main line shaft of the mill, thus doing 
away with the double compartment shaft required in the 
tailings elevator, which must be enclosed to protect it from 
the wind. 
ELEVATOR BUCKET 
PLAN 
SIDE VIEW 
FRONT VIEW 
2 eY 
Fig, 48. Details of elevator buckets of sheet iron, showing method of attaching to belt. 
