CLEARFIELD    COAL    FIELD,    PENNSYLVANIA.  275 
I    At  the  present  time  the  largest  producers  in  this  field  are  the  Berwind-White  Coal  Mining 
Company;  Irish  Brothers;  Peale,  Peacock  &  Kerr;  and  the  Morrisdale  Coal  Company,  each 
if  which  mines  about  half  a  million  tons.  There  are  no  very  large  mines  in  the  area  imme- 
liately  under  consideration.    None  of  the  mines  yields  over  200,000  tons  a  year,  and  most 
;if  them  yield   less  than  25,000  tons.     They  are  practically  all  nongaseous;    the  majority 
|j»f  the  smaller  mines  still  use  the  furnace  for  ventilation,  while  the  larger  mines  use  fans, 
wo  of  these  being  of  the  Capell  type.  About  half  a  million  tons  of  coal  are  mined  by 
nachine,  74  machines  being  used  in  1903  in  12  different  mines.     Of  these  machines  5  are 
llectric  and  the  rest  use  compressed  air.  Only  a  small  amount  of  coke  is  now  produced 
n  this  district,  amounting  to  less  than  100,000  tons,  the  largest  production  being  at  Irvona, 
vhere  there  are  100  ovens.  Seven  of  the  mines  make  use  of  20  electric  motors  for  haulage, 
ind  2  steam  engines  are  used.     Most  of  the  mines  can  not  be  classed  as  up  to  date  in 
Lheir  mining  equipment,  though  a  few  of   the  large  mines,  as  suggested  above,  are  well 
equipped. 
