106  CONTRIBUTIONS'  TO    ECONOMIC    GEOLOGY,  1900,  PART    I. 
The  Lucky  Henry  incline,  288  feel  deep,  has  a  hanging  wall  of  lime 
stone  and  a  loot  wall  of  iron-stained  schist.  The  limestone,  whic 
dips  45°  S.  50°  E.,  is  but  2  to  4  feet  thick,  and  in  front  of  it  lies 
second  schist  band.  Since  the  dip  varies  somewhat  in  amount,  th 
hanging  wall  leaves  the  incline  at  several  points,  and  at  such  place 
drifts  extend  to  it.  The  ore  lies  in  the  schist  against  the  hangin 
wall  in  two  lens-shaped  masses  separated  from  each  other  by  barre 
schist.  These  lenses  are  from  1  to  6  feet  thick  and  appear  to  cor 
tin ue  downward  from  the  surface  to  the  bottom  of  the  incline  with 
width  of  15  feet  or  more,  although  there  may  he  breaks  in  the  or 
where  the  foot  wall  is  not  exposed.  Within  the  lenses  the  schi> 
contains  ramifying  veinlets  and  stringers  of  malachite  and  chrysc 
colla,  with  a  little  chalcopyrite.  Chalcopyrite  first  appears  at  50  fee 
from  the  surface  and  continues  to  the  bottom.  Veinlets  of  late 
origin,  which  are  filled  with  calcite  or  quartz,  cut  the  ore  stringers 
Edwin  Hall,  the  president  of  the  company,  states  that  the  lenses  ru 
from  2  to  8  per  cent  of  copper,  and  that  the  iron-stained  schist  aronn 
the  lenses  carries  from  $1  m  $12  in  gold  per  ton,  with  an  average  c 
$3,  and  from  2  to  5  ounces  of  silver  per  Ion.  The  lower  10  feet  c 
the  incline  is  slightly  moist  and  surface  water  now  follows  the  schis 
hanging  wall  downward.  Development  has  not  proceeded  far  enoug 
to  determine  beyond  doubt  how  this  deposit  was  formed.  Ascendin 
water  ma\  have  been  the  agent.  If  this  is  true,  the  original  sulphide 
have  been  largely  changed  to  carbonates  and  silicates  by  surface4  water* 
descending  along  the  schist   foot  wall. 
The  Gold  Hill  and  Omaha  shafts  are  situated  on  a  band  of  schis 
from  7  to  "JO  feet  wide  lying  between  two  limestone  beds.  At  th 
Gold  Hill  shaft  the  dip  is  45°  S.  40°  E.,  and  at  the  Omaha  4l>°  S.  (it 
E.,  the  schist  band  between  the  two  describing  an  S.  In  the  Go! 
Hill  shafl  the  ore  is  in  a  cross  vein  bounded  by  fracture  planes  whic 
dip  60°  S.  75°  W.  This  vein  is  0  feet  wide  and  beneath  it  is  a  2-foc 
bell  of  iron-stained  schist  which  is  said  to  assay  in  gold  $4  per  toi 
Malachite,  chrysocolla,  and  a  little  chalcocite  occur  within  the  shod 
in  veinlets  parallel  to  and  cutting  the  schistosity.  A  quartz  vei 
parallel  to  the  schistosity  is  shattered  and  in  its  fractures  are  stringei 
and  nodules  of  chalcocite  and  bornile.  probably  original  sulphide.' 
These  are  partially  altered  to  chrysocolla,  malachite,  and  azurite. 
At  the  Omaha  incline  chrysocolla,  malachite,  azurite,  chalcocite 
and  chalcopyrite  occur  in  schist  in  stringers  both  parallel  to  th 
schistosity  and  cutting  it.  Barite  is  present  as  a  gangue.  The  on 
bearing  zone  reaches  a  maximum  width  of  4  feet  and  Hall  states  tha 
it  assays  2  per  cent  copper,  although  by  hand  picking  the  content 
could  be  raised  to  4  per  cent.  The  copper-bearing  lens  is  expose 
more  or  less  continuously  for  204  feet.  The  open  cut  on  the  Emm 
claim  discloses  a  fracture  zone   in   schists  containing  quartz   lense 
