6o 
ALASKA GEOLOGY 
At the time of my visit active mining work was chiefly 
confined to the no-foot level, much stoping being done 
there, and all ore taken from the open pit above being run 
down to that level in chutes and hoisted from there 
through the main shaft. 
The 220-foot level was also well opened out by drifts 
and cross-cuts, and stoping had already been begun on a 
limited scale. Below this, levels cross-cutting the deposit 
had been run out at 330 and at 440 feet, and were open to 
inspection, but no drifting had yet been done from them. 
About 2,000 tons of ore a day were being lifted from this 
mine through the two shafts. 
Two sections across the deposit were roughly measured, 
FIG. 15. DIAGRAMMATIC SECTION OF TREADWELL MINE; 44O-FOOT LEVEL. 
Scale, 1 inch = 150 feet. 
one at the open pit level, the other in the cross-cut on the 
440-foot level (reproduced in figs. 14, 15). From these 
sections it may be seen that the width of the deposit be- 
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