800 1000 1200 1400 1600 1800 2000 2200 2400 

 Mine elevation (m) 



1200 1400 1600 1800 

 Mine elevation (m) 



2000 2200 2400 



Figure 2. Mean mine temperature decreases with increased elevation in winter (Jan- Apr: r = 

 -0.744, P = 0.034) and summer (Jun-Jul: r = -0.828, P = 0.0 1 1 ) in southwestern Montana. Points are 

 mean values for individual mines, using data from Table 2. Dashed line is the 95% confidence inter^-al. 



