LEAD   AND  ZINC. 
In  addition  to  the  two  papers  presented  below,  other  references  to 
lead  will  be  found  in  several  papers  in  the  section  on  gold  and  silver, 
as  all  reports  on  districts  in  which  silver-lead  ores  are  prominent 
have  been  included  under  the  precious  metals. 
An  extensive  investigation  of  the  Mississippi  Valley  lead  and  zinc 
deposits  is  now  being  carried  on  by  the  Survey. 
LEAD  AND  ZINC  DEPOSITS  OF  ILLINOIS. 
By  H.  Foster  Bain. 
Location. — Lead  and  zinc  are  found  and  have  been  mined  in  Illinois 
in  two  widely  separated  districts.  One  of  these  occurs  in  the  extreme 
southern  portion  of  the  State  and  includes  portions  of  Hardin,  Pope, 
and  Saline  counties;  for  convenience  it  may  be  referred  to  as  the 
southern  Illinois  district.  The  other  includes  a  portion  of  Jo  Daviess 
County,  in  the  extreme  northwest  corner  of  the  State.  It  may  con- 
veniently be  called  the  northwestern  Illinois  district. 
SOUTHERN  DISTRICT. 
The  southern  Illinois  district  has  not  as  yet  yielded  zinc  in  commer- 
cial quantity.  The  lead  which  is  found  there,  and  which  has  been 
mined  more  or  less  steadily  since  1842,  is  produced  at  present  in  con- 
nection with  the  mining  of  fluorspar.  As  the  district  is  separately 
discussed  in  this  volume  in  connection  with  a  description  of  the  fluor- 
spar mines,  no  attention  will  be  devoted  to  it  here,  except  to  note  that 
it  has  never  been  a  producer  of  zinc,  and  for  many  years  has  yielded 
only  a  very  few  tons  of  lead.  Probably  its  maximum  production  was 
in  1866-67,  when  there  was  a  yield  of  176,387  pounds  of  lead  from  the 
Fai  rview  mine.  Within  the  present  year  prospecting  near  Jonesboro, 
in  Union  County,  west  of  the  fluorspar  district,  has  developed  the 
presence  of  galena;  whether  in  paying  quantities  or  not,  it  is  too 
early  to  say. 
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