INVESTIGATION   OF   METALLIFEROUS   ORES. 
By  S.  F.  Emmons,  Geologist  in  Charge. 
ECONOMIC    PUBLICATIONS    OF    THE    YEAR. 
During  the  year  the  number  of  Survey  publieations  on  subjects  connected  with  the 
investigation  of  metalliferous  ores  within  the  United  States  proper  was  somewhat  smaller 
than  during  previous  years.  This  has  resulted  less  from  the  falling  off  of  the  amount  of 
work  done  in  that  line  by  members  of  the  Survey  than  from  other  causes,  among  which 
should  be  mentioned,  first,  the  fact  that  several  economic  geologists  have  resigned  from 
the  Survey  to  accept  more  remunerative  positions  elsewhere,  which  has  so  far  reduced  the 
available  force;  second,  the  administrative  investigations  intended  to  improve  the  serv- 
ice of  the  Government  Printing  Office,  but  whose  immediate  effect  has  been  to  delay 
temporarily  the  printing  of  the  Survey  reports.  The  following  publications  on  metal- 
liferous investigations  have  been  issued  during  the  year  1905: 
Professional  Papers: 
No.  36.  Lead,  zinc,  and  fluorspar  of  western  Kentucky,  by  E.  O.  Ulrich  and  W.  S.  Tangier-Smith. 
No.  38.  Economic  geology  of  the  Bingha  m  mining  district,  Utah,  by  J.  M.  Boutwell,  Arthur  Keith, 
and  S.  F.  Emmons. 
No.  42.  Geology  of  the  Tonopah  mining  district,  Nevada,  by  ,J.  E.  Spurr. 
No.  43.  Copper  deposits  of  Clifton-Morenci  district,  Arizona,  by  Waldemar  Lindgren. 
Bulletins: 
No.  246.  Zinc  and  lead  deposits  of  northwestern  Illinois,  by  II.  F.  Bain. 
No.  253.  Fluorspar  deposits  of  southern  Illinois,  by  II.  F.  Bain. 
No.  267.  Copper  deposits  of  Missouri,  by  II.  F.  Bain  and  E.  O.  Ulrich. 
Folios:  » 
No.  120.  Silverton  quadrangle,  Colorado,  by  Whitman  Cross,  Ernest  Howe,  and  F.  L.  Ransome. 
No.  126.  Bradshaw  Mountains  quadrangle,  Arizona,  by  T.  A.  Jaggar,  jr.,  and  Charles  Palache. 
No.  129.  Clifton  quadrangle,  Arizona,  by  Waldemar  Lindgren. 
Unpublished  studies. — (1)  Studies  of  which  the  field  and  office  work  have  been  entirely 
completed  and  the  reports  written  by  the  authors,  in  different  stages  of  completion  for 
final  publication: 
Professional  papers: 
The  geology  and  gold  deposits  of  the  Cripple  Creek  district,  Colorado,  by  Waldemar  Lindgren  and 
F.  L.  Ransome. 
Ore  deposits  of  the  Silver  Peak  quadrangle,  Nevada,  by  J.  E.  Spurr  and  G.  II.  Carrey. 
Ore  deposits  of  the  Cccur  d'Alenc  district,  Idaho,  by  F.  L.  Ransome  and  F.  C.  Calkins. 
Copper  deposits  of  the  Appalachian  region,  by  W.  H.  Weed. 
Bulletin: 
Reconnaissance  of  some  gold  and  tin  deposits  of  the  Southern  Appalachians,  by  L.  C.  Graton, 
with  notes  on  the  Dahlonega  mines,  by  Waldemar  Lindgren. 
(2)  Studies  for  which  the  field  work  has  been  completed  and  whose  manuscript  is  in 
more  or  less  advanced  stages  of  completion  by  the  authors: 
Ore  deposits  of  the  Georgetown  mining  district  of  Colorado,  by  J.  E.  Spurr  and  G.  H.  Garrey. 
Economic  geology  of  the  Park  City  mining  district  of  Utah,  by  J.  M.  Boutwell. 
Copper  deposits  of  the  Butte  district,  Montana,  by  W.  II.  Weed. 
Resurvey  of  the  Leadvillc  mining  district  of  Colorado,  by  S.  F.  Emmons  and  J.  D.  Irving. 
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