36  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,    L906,  PART    I. 
phic  origin.  Several  other  mines  near  the  Cable  are  loeated  in  the 
sedimentary  rock  near  the  granite  contact,  but  in  these  mines  the  ore 
bodies  so  far  as  developed  are  distinctly  replacement  veins  along 
fissures.  One  important  group  of  replacement  deposits  is  that  of 
Hope  Hill,  where  very  siliceous  silver  ore  occurs,  for  the  most  part 
as  rudely  tabular  bodies  in  the  bedding  planes  of  limestone,  but  it  also 
makes  out  from  those  horizons  as  relatively  long,  curved  cylinders, 
crossing  the  bedding  in  all  directions. 
GRANITE-BIMETALLIC    MINE. 
BISTORT    AM)    DEVELOPMENT. 
The  Granite  Mountain  and  Bimetallic  mines  are  about  2\  miles 
southeast  of  Philipsburg,  on,  the  steep  western  slope  of  Granite 
Mountain,  which  rises  3,000  feet  above  the  valley  of  Mint  Creels 
Although  rout  rolled  from  the  first  by  nearly  the  same  interests  audi 
on  the  same  ore  shoot,  they  were  worked  separately,  each  with  its 
own  reduction  plants,  until  1898,  when  a  consolidation  was  effected. 
Since  t  bat  t  ime  t  be  mines  have  been  operated  as  one. 
The  Granite  Mountain  mine  was  first  located  in  1872,  but  the  loca- 
tion was  allowed  to  lapse  and  in  1875  it  was  relocated  by  E.  D.  Hol- 
land, J.  W.  Estell,  and  Josiah  M.  Merrell.  In  1880  Charles  1). 
McLure,  then  superintendent  of  the  Hope  mill,  encouraged  by  assay 
of  a  specimen  picked  up  from  1  be  dump,  obtained  a  bond  on  t  be  prop- 
erty for  $  10,1)1)0.  After  spending  several  thousand  dollars  in  devel- 
oping the  block  of  ground  between  what  is  now  level  1  and  level  2, 
with  fairly  promising  returns,  be  succeeded  in  organizing  a  syndicate 
of  St.  Louis  investors,  chiefly  from  the  Hope  directorate,  who  advanced 
him  altogether  $132,000.  The  mine  was  examined  in  April,  18811 
by  Prof.  J.  K.  Clayton,  who  reported  $75,000  worth  of  ore  in  sight, 
the  vein  being  from  4  to  6  feet  wide,  with  an  average  value  of  44  I 
ounces  of  silver.  At  this  time  tunnel  (level)  No.  1  had  been  driven; 
186  feet  and  No.  2  443  feet,  tapping  the  ore  shoot  300  feet  from  the 
portal.  This  ore  was  iron-stained  quartz,  carrying  a  small  amount 
of  silver  chloride  but  relatively  of  low  grade.  Development  work 
was  continued  steadily,  and  in  L882  and  1883  about  1,400  tons  from 
levels  1  and  2  were  milled  at  the  Algonquin  mill,  at  Hasmark,  \\ 
miles  northwest  of  the  mine,  a  fair  saving  being  made  by  dry  crush- 
ing, roasting,  and  pan  amalgamation.  As  exploration  readied 
greater  depth  the  oxidized  ores  became  higher  in  grade  and  sulphidl 
ores  extremely  rich  in  silver  were  found  about  200  feet  below  the 
surface.  Assured  of  sufficient  reserves,  the  company  built  at  the 
mine  a  dry-crushing  stamp  mill  (mill  A)  with  chloridizing  roasting 
furnace,  and  soon  followed  it  by  one  of  larger  capacity,  making  a  total 
of  80  stamps.     At  this  time  the  tenor  of  the  ore  milled  was  very  high 
