112° GUIDEBOOK OF THE WESTERN UNITED STATES, 
feet high, from which issues a never-failing cloud of yellow smoke. 
The train does not pass close enough to Anaconda for the traveler 
to see much of the town, which is reached by a spur from the main 
line at Durant, but he is soon made aware of the effect of the waste 
waters from the concentration plant, which have flowed down the 
ereek and killed most of the vegetation. Back of the smelter is 
Mount Haggin, named for James B. Haggin, who for many years was 
prominent in the mining industry of Butte. On the west side of the 
valley farther north is Racetrack Peak, which stands like a senti- 
nel keeping guard over the entire valley. In 1910 Anaconda had a 
population of 10,134. 
have been accomplished in one of three 
ways, as illustrated by figure 23. In 
this diagram AB represents a section 
across a country with a hilly surface. A 
broad valley may be formed by a simple 
depression of the region, as illustrated 
fault, as shown in FG. Here the block 
of strata on the left has been tilted toward 
the right and at the same time dropped 
along the fault HI until a depression and 
lake are formed, The third and last case 
is that of a block of the earth’s crust 
Me ee to ff ase lt tl 
YY) My YY YY YL Mina oii 
c Ses F, 
iMixxr.F vec === ymin 
MM MEET 
4 
TN =e 
MMM A — TUE Mh 
FIGURE 23.—Diagrams illustrating the ways in which the broad valleys of the Rocky Mountain region 
: were formed. 
by CE, in which the center D is depressed 
so much that the tops of the hills fall be- 
low drainage level. In such a case the 
depressed portion becomes a lake, and 
the lake is finally filled by waste material 
washed in from the surrounding region. 
Similar results may be produced by a 
dropped between two nearly parallel 
faults, as shown in JK. 
Deer Lodge Valley was sotto. pro- 
duced by one of the three methods 
scribed above, but by which one can 
be told only by close examination and 
ping. 
