ORE  DEPOSITS  OF  BINGHAM,  UTAH. 
By  J.  M.  Boutwell. 
INTRODUCTION. 
In  an  earlier  progress  report  upon  this  subject,  general  features 
of  geography,  history  and  development,  and  geologic  features  ol 
direct  economic  bearing  were  briefly  sketched,  and  conclusions  re- 
garding the  character  and  occurrence  of  the  ores,  etc.,  were  pre- 
sented.0 At  that  date,  however,  the  incompleteness  of  the  stud] 
precluded  final  statements  upon  these  latter  subjects  and  rendered 
it  undesirable  to  discuss  problems  of  genesis.  Since  the  publicatioi 
of  that  progress  report  the  contributions  by  the  several  authors  hav( 
been  completed.6 
As  the  present  volume  is  expected  to  appear  before  the  complel 
report,  a  bare  general  statement  of  these  additional  conclusions,  to- 
gether with  a  brief  sketch  of  recent  developments,  is  now  presente( 
for  immediate  use.  For  the  detailed  evidence  upon  which  thes( 
conclusions  are  based  the  reader  is  referred  to  the  forthcoming 
report. 
CHARACTER  OF  ORES. 
Bingham  is  the  leading  copper-producing  camp  in  Utah.  Thl 
copper  shipments  are  made  up  almost  entirely  of  sulphide  ores,  ii 
which  low-grade  primary  sulphides,  massive  chalcopyrite,  and  pyril 
predominate.  The  grade  is  raised,  however,  by  secondary  blacl 
copper  sulphides,  including  chalcocite,  tetrahedrite,  and  tenorite 
Some  argentiferous  lead  ores,  mainly  galena,  are  also  shipped  regu- 
larly. The  copper  ores  yield  accessory  gold,  silver,  and  iron;  th( 
argentiferous  lead  ores,  accessory  copper. 
The  copper  content  in  the  average  sulphide  ores  is  low,  ranginj 
from  2 J  to  44  per  cent;    but  the  accessory  gold,  averaging  from   10 
a  Boutwell,  J.  M..  Ore  deposits  of  Bingham  :'' Bull.  U.  S.  Geol.  Survey  No.  213,  pp. 
1 05-122. 
''The  complete  report  is  now  in  press,  and  is  expected  to  appear  this  spring.  It  is 
Professional  Paper  No.  38„  entitled  "Economic  Geology  of  the  .Bingham  Mining  District, 
Utah,  by  J.  M.  Boutwell,  with  a  Section  on  Areal  Geology  by  Arthur  Keith  and  an  Intro- 
duction on  General  Geology  by  S.  P.  Emmons."  Copies  may  be  obtained  free  of  chars 
upon  request  to  the  Director  of  the  United  States  Geological  Survey,  Washington,  D.  C. 
236 
