PROGRESS  REPORT   ON  THE  PARK  CITY   MINING  DISTRICT, 
UTAH." 
By  J.  M.  Boutwell. 
INTRODUCTION. 
Field  work: — In  August,  1902,  the  detailed  study  of  the  economic 
geology  of  the  Park  City  (Utah)  district  was  undertaken  by  J.  D. 
Irving  and  the  writer.  At  the  close  of  the  season,  late  in  Decem- 
ber, the  detailed  geologic  mapping  of  a  considerable  portion  of  the 
district  on  a  scale  of  3  inches  to  a  mile,  the  larger  part  of  the 
geologic  mapping  of  the  heart  of  the  district  on  a  scale  of  1  inch  to 
1,000  feet,  and  a  reconnaissance  of  the  principal  producing  mines 
had  been  accomplished.  The  salient  features  of  the  geography, 
geology,  and  ore  deposits  which  had  then  been  studied  have  been 
briefly  described  in  a  progress  report.6 
Early  in  August,  1903,  this  detailed  geologic  mapping  was  again 
taken  up,  and  after  being  completed  late  in  the  fall  the  detailed  study 
of  the  underground  geology  and  of  the  ore  deposits  was  begun.  This 
underground  work  is  now  in  progress.  In  the  work  of  this  season  the 
writer  has  been  assisted  by  L.  H.  Woolsey,  and  toward  the  close  of 
the  year,  for  about  seven  weeks,  by  A.  M.  Rock. 
Early  in  the  season  the  Director  of  the  United  States  Geological 
Survey  visited  the  party  en  route  to  and  from  special  field  work  in  a 
neighboring  range.  Dr.  C.  W.  Hajes,  geologist  in  charge  of  geology, 
also  spent  a  few  days  in  the  district  investigating  some  of  the  prob- 
lems under  consideration,  and  Dr.  T.  W.  Stanton,  geologist  in  charge 
of  paleontology,  devoted  ten  days  to  field  study  of  certain  questions 
of  stratigraphic  and  paleontologic  correlation.  Dr.  G.  H.  Girt}^  has 
examined  the  fossils  collected  during  the  season  of  1902  and 
several  additional  lots  of  fossils  collected  for  purposes  of  special  cor- 
a  The  complete  report  on  the  final  results  of  the  work  in  this  district  will  be  published  as  a  profes- 
sional paper. 
b Boutwell,   J.   M.,  Progress  report  on  the   Park  City  mining  district,    Utah:  Bull.    U.    S.    Geol. 
Survey  No.  213,  1903,  pp.  31-40. 
141 
