ZINC  AND  LEAD  MINES  NEAR  DODGEVILLE.  WIS. 
By  E.  E.  Ellis. 
Location. — The  Dodgeville  deposits  lie  in  the  extreme  northeast 
•ortion  of  the  Wisconsin  lead  and  zinc  district,  which  occupies  about 
,500  square  miles  in  the  southwest  corner  of " the  State.  This 
rea  has  been  chosen  for  discussion  because  of  its  comparative  isola- 
ion  from  the  remainder  of  the  district  and  because  its  mines  are 
ypes  of  the  ore  deposits  occurring  in  the  so-called  "  glass-rock  open- 
rig  "  of  the  Platteville  limestone.  The  area  in  which  mining  has 
een  carried  on  is  relatively  small,  including  not  more  than  10  square 
riles,  while  nine-tenths  of  the  mining  has  been  carried  on  within  the 
units  of  four  sections  of  land. 
The  history  of  this  portion  of  the  district  has  been  similar  to  that 
f  the  rest  of  southwestern  Wisconsin.  Mining  was  first  carried  on 
or  galena  alone,  then  for  galena  and  smithsonite,  a  market  being 
ound  for  the  latter,  and  of  late  years  largely  for  zinc  blende. 
Development  work. — There  are  at  present  seven  producing  mines  in 
tie  area — the  Williams  Brothers,  producing  blende  and  galena ;  the 
Iartford  Lead  and  Zinc  Mining  Company,  starting  development 
fork  on  an  old  lead  range;  the  Snowball  and  Oxman  mines,  both 
ielding  galena  and  blende;  the  Davy-Pengelly  mine,  with  galena 
nd  smithsonite,  and  the  Tyrer  and  McKinley  mines,  the  former  pro- 
ucing  galena  and  the  latter  blende.  In  the  area  are  a  number  of 
bandoned  mines  which  in  the  past  have  been  producers  of  galena 
nd  smithsonite,  while  there  are  a  number  of  small  mines  that  are 
forked  only  during  the  winter.  The  Williams  Brothers'  mine  has 
een  the  heaviest  producer  in  this  locality  and  is  the  only  mine 
quipped  with  a  concentrating  mill. 
The  machinery  used  in  these  mines  is  very  simple,  for  in  no  case 
3  the  ore  hoisted  more  than  100  feet,  while  in  several  of  the  mines  no 
lumping  machinery  whatever  is  needed.  In  the  mines  not  equipped 
rith  concentrating  mills  the  ores  are  cleaned  by  hand  picking  and  in 
mall  jigs  run  by  horsepower  or  by  hand. 
Economic  importance. — The  vicinity  of  Dodgeville  has  been  a 
teady,  though  never  a  heavy,  producer  of  galena  since  1855.     About 
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