ECONOMICS 



trolytic refining of copper. It is abundant in the('rip|. 

 Colorado, district as tin- mineral calavcrite. It occurs also in the 

 Hold ores of the ('amp Bird :md Torpedo-Kdipse Mining Compa- 

 nies in the San Juan district. In the Cripple Creek di-trirt 

 alone more than 500 tons of tellurium has become a waste prod- 

 uct. No practical use is known for the 'element and therefore 

 there is no market. It is known however that in certain experi- 

 ments the element has shown a peculiar behavior toward elec- 

 tricity which seems to indicate that electrical uses may yet be 

 found for tellurium. 



