112 University Geological Survey of Kansas. 
underlying flint that may be very rich in ore. For some 
reason in Missouri miners are not quite so afraid of limestone, 
and many instances are noted of shafts being sunk through 
an overlying bed of limestone into exceedingly valuable ore 
beneath. Again, in some cases ore does occur to considerable 
extent in the limestone itself, but only when found close to 
large bodies of flint rock. 
This great preponderance of flint rock may be detected by 
any one visiting the mining district and examining the refuse 
on the surface. Scarcely an instance can be found in which 
such refuse contains enough limestone to be noticeable, either 
coarse hand-picked rocks or the fine Se coming from the 
AFTER BAIN, ,USGS. 
ose 
= [eee be LL 
Boe dar, 
=] gies 
oe oh el 
ree 
Fig. 3. Underground workings at Center Creek Valley, near Webb City, Mo. After 
Bain, U.S. G. S., Twenty-second Annual Report, part II, p. 144. 
(2 | 
Bue 
