52  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1905. 
The  surveys  for  the  tunnel  have  been  completed,  and  its  construction  actually  begun,  so 
that  in  the  near  future  the  mine  will  probably  resume  its  place  as  a  producer. 
The  ore  body  is  a  fissure  vein  about  3  feet  in  average  width,  striking  about  northwest  and 
dipping  steeply  to  the  northeast.  The  country  rock  is  somewhat  calcareous  light-green  shale 
of  the  Wallace  formation.  The  ore  is  argentiferous  galena  with  a  little  sphalerite  carrying 
about  6  ounces  of  silver  to  the  ton.  The  concentrates  constitute  about  45  per  cent  of  the 
ore  as  mined. 
SUMMARY. 
In  regard  to  the  region  as  a  whole,  the  similarity  of  its  rocks  to  those  of  the  Coeur  d'Alene 
district,  together  with  its  position  between  that  district  and  the  great  producing  mines  ofj 
southern  British  Columbia,  may  well  mark  it  as  a  promising  field  for  the  prospector.  More- 
over, large  faults  and  their  accompanying  smaller  fractures  afford  great  systems  of  circulation 
for  underground  waters  and  greatly  increase  the  opportunities  for  ore  deposition  in  those 
fissures  which  present  the  proper  conditions.  Dikes,  which  in  oilier  mining  regions  have 
also  been  recognized  as  indicative  of  mineralized  conditions,  are  abundant. 
In  conclusion,  the  reconnaissance  has  left  a  si  rong  impression  that  systematic  and  wisely 
directed  work  in  this  region  will  yield  good  results. 
