94  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,    L906,  PART    I. 
HISTORY  AND   PRODUCTION. 
In  1878  John  Fields,  keeper  of  a  stage  station   14  miles  north  of 
Fort  Laramie  on  the  Black  Hills  and  Cheyenne  stage  line,  found 
copper  ore  piled  beside  a  tunnel  1J  miles  north  of  Frederick.     Old 
trails,  well  worn,  led  up  to  the  tunnel,  and  this  may  have  been  the 
work  either  of  French  trappers  or  of  prehistoric  races  in  search  of 
the  brilliantly  colored  chrysocolla.     In  1879  the  blanket  vein  of  the] 
Silver  Cliff  'mine  was  discovered  by  John  Madden,  and  two  years] 
later  the  Green   Mountain  Boy  and   the  Sunrise  deposits  were  dis- 
covered by  Henry  T.  Miller,  of  Hartville.     These  mines  and  some  of 
those  of  Muskrat    Canyon   were   more  or  less  actively  exploited   in 
lssi   and   t882,  75  miners  having  been  employed  at  one  time  in  the 
Sunrise  mine.     The  more  or  less  complete  exhaustion  of  the  copper 
deposits   and    the   drop    in    copper   prices,    together   with   the   great 
expense  entailed   in  hauling  ore  and   machinery  to  and  from  Chey-' 
enix1     distanl    120  miles  from  tin4  nearest  mines     all  contributed  to 
their  shut  down.      In  1888  the  Sunrise  mine  was  reworked  for  a  few] 
months.     Later  developments  Include  the  finding  by  Henry  Metz  of 
the  Green  Hope  deposil  in  1901 ,  and  the  formation  by  Edwin  Hall  of 
the  Copper  Belt  Mines  Company  at  Rawhide  Butte  in  1906. 
The  production  as  given  by  Knight  "  is  as  follows: 
Production  of  coppt r  mints  near  Uartville,   Wyo. 
Sunrise  mine $209,  282 
Michigan  mine  i  Muskrat  <  Janyon  > 40,  000 
Green  Mountain  Boy. " 30,000 
27!).  282 
The  estimate4  here  given  for  the  Green  Mountain  Boy  is  certainly 
$25,000,  and  probably  $30,000,  too  low,  which,  together  with  the 
product  of  a  numher  of  smaller  mines  and  prospects,  would  raise  the 
total  to  $350,000. 
ORE   DEPOSITS. 
GEN  EB  V.L    DESCRIPTION. 
Geographically,  copper  is  widely  distributed  in  the  Hartville  uplift, 
and  there  is  scarcely  a  square  mile  underlain  by  pre-Cambrian  and 
Guernsey  formations  which  does  not  contain  copper  showings.  (See 
fig.  5,  p.  192,  for  location  of  principal  mines.)  No  very  large  mine 
has  ever  been  discovered  within  the  confines  of  the  uplift,  but  copper 
is  so  widely  distributed  that  the  possibility  of  finding  a  mine  or 
mines  of  some  size  is  by  no  means  unlikely. 
a  Bull.  Wyoming  Exper.  Sta.  No.  14,  1893,  p.  135. 
