SOUTHWESTERN    NEVADA    AND    EASTERN    CALIFORNIA.  73 
The  prospects  at  Chloride  Cliff  are  on  either  fissure  veins  or  contact  deposits.  In  some 
i&ses  the  quartz  and  accompanying  sulphides  probably  filled  open  fissures,  while  in  others 
lie  limestone  was  metasomatically  replaced.  There  is  a  distinct  tendency  for  galena  to  be 
lie  predominant  sulphide  in  limestone  and  pyrite  in  the  other  country  rocks.  Since  the 
leposition  of  the  quartz  the  veins  have  been  crushed  and  surface  waters  have  produced 
rom  the  original  sulphides  native  gold,  copper,  cerussite,  malachite,  and  limonite.  The 
leposits  are  structurally  those  which  hold  their  values  well  with  depth,  and  if  surface 
jnrichment  has  not  been  out  of  all  proportion  to  the  original  sulphide  values  further  develop- 
nent  is  well  justified. 
Water  is  at  present  packed  on  burros  from  Keane  Spring,  4  miles  distant.  Wood  suitable 
'or  fuel  occurs  on  the  Grapevine  Range  10  miles  north  of  the  prospects,  but  at  present  must 
ie  teamed  by  way  of  Bullfrog.  A  fair  road  connects  the  prospects  with  Bullfrog,  the 
hipping  and  supply  point. 
Gold  Belt. — Gold  Belt,  a  deserted  camp  in  the  Panamint  Range,  is  situated  in  a  deep  gulch 
lear  the  southwest  corner  of  the  area  surveyed.  Here  the  black,  fine-grained  Silurian 
imestones  are  injected  by  a  batholith  of  diorite,  in  which  both  hornblende  and  biotite  are 
isually  associated.  The  limestone  has  been  altered  near  the  contact  to  a  white  coarse- 
grained marble.  A  number  of  men  are  said  to  have  rushed  to  this  camp  in  the  spring  of 
L905,  but  little  work  was  accomplished.  The  more  important  development  work  was  done 
mi  certain  thin  veins  or  lenses  in  the  diorite.  The  ore  contains  a  little  chalcopyrite,  prob- 
ibly  a  portion  of  the  original  sulphide  unaltered.  Of  clearly  later  origin  are  chrysocolla, 
nalachite,  and  a  dark-brown  or  black  iron-stained  chalcedony  of  approximately  contem- 
poraneous age.  These  minerals  are  coated  with  small  quartz  crystals.  This  ore  is  said 
jO  pan  free  gold.  Similar  ore  is  reported  from  other  localities  in  this  diorite  area.  A 
Specimen  from  near  the  headwaters  of  Cottonwood  Creek  is  identical  with  the  ore  of  Oak 
spring  already  described,  both  chrysocolla  and  brochantite  being  present. 
Water  and  fuel  are  near  by.     Gold  Belt  is  50  miles  from  Bullfrog  by  trail  and  road. 
