spencer] COPPER DEPOSITS AT PEARL, COLO. 169 
latter, together with a small amount of zinc blende, revealed by the 
microscope. 
Other prospects. — At the time the region was visited many other 
prospects, apparently similar in character to those mentioned, had 
been located, and upon some of them about the same amount of 
development had been done. The ores of copper encountered were in 
most cases chalcopyrite, as in the properties described, though in one 
case large masses of richer sulphides, said to have come from an open 
cut about 12 feet in depth, were seen. 
PROBABLE VALUE OF REGION. 
The rapid examination of a few properties in the vicinty of Pearl 
made by the writer can not with fairness be made the basis of any 
opinion, favorable or otherwise, concerning the probable future of the 
milling industry of the region. All the properties visited are in the 
development stage, but the work in progress should soon determine 
in a practical way the important questions whether any of the ore 
bodies are of sufficient size and permanence to afford commercially 
important deposits. 
