INVESTIGATIONS  OF  METALLIFEROUS  ORES. 
By  S.  F.  Emmons,  Geologist  in  Charge. 
ECONOMIC   PUBLICATIONS   OF  THE  YEAR. 
During  the  year  the  following  publications  on  subjects  connecte 
with  the  investigation  of  metalliferous  ores  within  the  United  States 
proper  have  been  issued  by  the  Survey : 
Profess! oiki I  Papers: 
No.  54.  Geology  and  gold  deposits  of  Cripple  Creek  district.  Colorado,  byWald< 
mar  Lindgren  and  F.  L.  Ransome. 
No.  55.  Ore  deposits  of  Silver  Peak  quadrangle,  Nevada,  by  J.  E.  Spurr. 
No.  57.  Geology  of  the  Marysville  mining  districl    Montana,  by  Joseph  Barrell. 
Bulh  tins: 
No.  293.   Reconnaissance  of  gold  and  tin  deposits  of  the  southern  Appalachian^ 
by  L.  0.  Graton,  with  notes  on  the  Dahlonega mines  by  Waldemar  land 
gren. 
No.  29  I.  Zinc  and  lead  deposits  of  the  upper  Mississippi  Valley,  by  E.  F.  Bain. 
No.  •"•<>:'».   Preliminary  reporl  on  Goldfield,  Bullfrog,  and  other  mining  districts 
southern  Nevada,  by  P.  L.  Ransome,  G.  H.  Garrey,  and  \Y.  II.  Emmom 
No.  308.  Geological    reconnaissance  in   southwestern   Nevada  and   eastern  CaU 
fornia,  by  S.  II.  Ball. 
No.  312.   Interaction  between  minerals  and  water  solutions,  with   special  relet 
ence  to  geologic  phenomena,  by  E.  < '.  Sullivan. 
Bulletin  No.  312,  though  not  directly  the  result  of  geological  fiel< 
work,  has  an  important  bearing  thereon,  in  that  it  is  a  chemical  inves 
tigation  of  some  of  the  problems  that  come  up  most  frequently  in  th 
study  of  the  origin  of  ore  deposits. 
REPORTS   FOR   WHICH   FIELD  WORK  HAS   BEEN  COMPLETED,  BU' 
WHICH   HAVE  NOT  YET  BEEN   ISSUED. 
Economic  geology  of  the*  reorgetown  quadrangle  (together  with  (he  Empire  district 
Colorado,  by  J.  E.  Spurr  and  G.  H.  Garrey,  with  a  chapter  on  geology  by  S.  II.  Ball. 
<  loppei  deposits  of  the  Untie  district,  Montana,  by  W.  II.  Weed. 
Economic  geology  of  the  Park  City  mining  district,  Utah,  by  J.  M.  Boutwell  an 
Lester  H.  Woolsey. 
Ore  deposits  of  the  Cceur  d'Alene  district,  Idaho,  by  F.  L.  Ransome  and  F 
Calkins. 
Resurvey  of  the  Leadville  mining  district,  Colorado,  by  S.  F.  Emmons  and  J.  D 
Irving. 
The  Neocene  auriferous  gravels  of  the  Sierra  Nevada,  l>\  Waldemar  Lindgren. 
Geology  and  ore  deposits  of  the  Franklin  Furnace,  New  Jersey,  quadrangle,  by  A. 
Spencer. 
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