GRANITE-BIMETALLIC    AND    CABLE    MINES,   MONTANA.  45 
In  a  number  of  places  a  sheeted  zone  of  granite,  produced  by  sev- 
eral closely  spaced  parallel  fracture  planes  and  containing  a  little 
crushed  quartz,  has  been  followed  with  the  hope  that  the  walls  of 
the  crushed  zone  will  eventually  inclose  good  ore.  There  is  little 
basis  for  such  a  hope,  since  the  sheeting  is  to  a  great  extent,  and 
probably  in  many  places  entirely,  due  to  movement  subsequent  to 
veining. 
North  of  Philipsburg,  bordering  on  the  area  traversed  by  the  fis- 
sure veins  just  described,  are  the  bedding-plane  replacement  depos- 
its of  Hope  Hill.  They  are  of  considerable  economic  importance 
and  have  produced  several  million  dollars'  worth  of  silver.  These 
deposits  are  not  discussed  in  this  paper.  The  structural  features  of 
greatest  economic  importance  in  connection  with  them  are  the  post- 
mineral  faults,  which  cross  them  at  a  considerable  angle  with  the 
bedding  of  the  country  rock.  By  far  the  greater  portion  of  these 
faults  are  normal,  which  generally  implies  a  downthrow  of  the  hang- 
ing wall. 
CABLE   MINE. 
LOCATION    AND    HISTORY. 
The  Cable  mine  is  situated  near  the  head  of  Cable  Creek,  about 
8  miles  southeast  of  the  Granite  mine  and  13  miles  northwest  of 
Anaconda.  It  is  7  \  miles  above  Browns  Siding,  the  terminus  of  the 
Butte,  Anaconda  and  Pacific  Railway.  It  was  discovered  in  1866, 
and  in  1867  the  Nowlan  mill  was  built,  where  9,000  tons  of  ore  were 
treated,  giving  a  production  of  $172,000.  According  to  Government 
reports  the  total  production  of  the  mine  up  to  1872  was  $400,000. 
The  placer  just  below  the  apex  of  the  ore  body  was  very  productive, 
and  in  1872  $18,000  was  taken  out  in  eight  weeks.  Some  of  the 
ore  from  the  mine  was  unusually  rich,  and  a  single  ton  is  said  to 
have  yielded  $30,000.  A  nugget  of  gold  from  this  mine,  worth  $375, 
was  shown  by  Solon  Cameron  at  the  Centennial  Exhibition. 
In  1877,  J.  C.  Savery  bought  the  mine  and  built  a  new  mill,  which 
was  operated  until  1891.  During  this  period  more  than  $2,000,000 
in  gold  was  taken  from  the  mine.  The  ore  was  free-milling  and  of 
good  grade.  Most  of  it  came  from  the  Cornish,  Square  Set,  and 
Lake  stopes,  from  100  to  300  feet  below  the  surface. 
The  ore  shoots  being  apparently  exhausted,  the  mine  was  idle 
from  1891  to  1900.  Later  the  management  was  obtained  by  F.  W.  & 
H.  C.  "Bacorn,  who  inaugurated  a  vigorous  plan  of  development 
with  a  view  to  opening  up  new  ore  bodies  in  the  lower  levels.  In 
their  hands  a  moderate  production  has  been  sustained  and  consid- 
erable new  ground  has  been  prospected.  The  total  production  of 
the  mine  since  discovery  is  from  $3,000,000  to  $4,000,000. 
