[12  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,    1903.  [bull.  225. 
from  ihc  mountains,  which  floors  the  valleys  and  fringes  the  mountains, 
forms  a  conspicuous  geological  feature. 
On  deposits. — Ore  deposits  are  known  to  exist  in  several  different 
parts  of  the  Silver  Peak  quadrangle.  The  chief  districts  are  the  Sil- 
ver Teak  district  proper,  near  its  central  part,  occupying  the  mountain 
spur  known  as  Mineral  Ridge,  west  of  the  camp  of  Silver  Peak;  the 
Lone  Mountain  district,  in  the  northwestern  corner,  most  but  not  all 
of  which  is  within  the  quadrangle;  the  Windypah  or  Fesler  district 
in  the  southern  part  of  the  Silver  Peak  Range;  and  what  may  be 
called  the  Palmetto  district,  on  the  northern  slope  of  the  mountains 
of  that  name.     Not  all  of  the  Palmetto  district  is  within  the  quadrangle. 
All  of  these  districts,  and  indeed  all  the  ore  deposits  known,  occur 
in  close  connection  with  large  intrusive  bodies  of  pre-Tertiary  granitic 
rock.  The  ore  bodies  sometimes  occur  within  the -granitic  rock,  but 
more  usually  in  the  Paleozoic  (Cambrian  and  Silurian)  limestones  into 
which  it  is  intrusive,  within  a  broad  belt  following  the  intrusive  con- 
tact.    They  do  not  occur  in  the  Tertiary  rocks. 
SILVER  PEAK  DISTRICT. 
The  Silver  Peak  district,  which  is  the  oldest  and  the  most  important, 
contains  abandoned  silver  mines  and  gold  mines  which  have  been  con- 
siderably worked  but  are  still  regarded  as  promising.  The  silver  pros- 
pects were  discovered  in  1864,  but  were  shortly  left  idle,  and  in 
1867  they  were  opened  up  again  and  worked  till  1869.  It  is  currently 
reported  that  the  profits  were  very  small.  A  10-stamp  mill  was 
finished  in  1866.  A  lixiviation  process  was  used,  the  ores  being 
leached  with  salt.    They  have  not  been  worked  since. 
The  principal  properties  thus  far  developed,  both  silver  and  gold, 
belong  to  Mr.  D.  C.  Blair,  of  New  York.  A  30-stamp  mill  for  working 
the  gold  ores  of  the  Blair  mine  was  finished  at  Silver  Peak  in  1867, 
and  was  worked  for  two  years.  The  mine  was  then  idle  till  the  early 
eighties,  when  it  was  leased  for  two  or  three  years.  Another  long' 
period  of  idleness  ensued,  and  in  1893  another  lease  was  given  for  one 
year.  Immediately  after  this  the  mine  became  involved  in  litigation, 
which  has  only  very  recently  been  settled.  Mining  and  milling  in  aj 
small  and  intermittent  way,  meanwhile,  has  been  conducted  on  a  num- 
ber of  the  veins,  generally  of  minor  importance,  outside  of  the  Blair 
properties. 
It  is  estimated  by  persons  who  have  been  familiar  with  the  history  I 
of  the  mining  here  that  the  silver  mines  have  produced  a  gross  value  \ 
of  1200,000,   most  of  which  came  from  the  Pocatello  and  the  Van-f 
derbilt,  while  the  Blair  gold  mine   is   estimated   to  have  produced 
$1,080,000. 
From  the  important  Mary  mine,  situated  near  the  Blair  gold  proper-!) 
ties,  Mr.  John  Chiatovich,  the  owner,  has  taken  out  and  milled  ore 
