CONTENTS 
Page. 
Introduction,  by  C.  W.  Hayes. 7 
Investigation  of  metalliferous  ores,  by  S.  F.  Emmons 14 
Investigation  of  iron  ores  and  nonmetalliferous  minerals,  by  E.C.Eckel  . .         20 
Gold  and  silver 25 
Colorado : 
Ore  deposits  of  Bear  Creek,  near  Silverton,  by  W.  H.  Emmons 25 
The  Hahns  Peak  gold  field,  by  II.  S.  Gale 28 
The  Idaho  Springs  mining  district,  by  G.  II.  Garrey 35 
Idaho-Montana: 
Economic  features  of  northern  Idaho  and  northwestern  Montana,  by  D.  F. 
MacDonald 41 
Nevada-California : 
Notes  on  the  ore  deposits  of  southwestern  Nevada  and  eastern  California, 
by  S.  H.  Ball 53 
New  Mexico: 
A  reconnaissance  of  the  mineral  deposits  of  New  Mexico,  by  Waldemar 
Lindgren  and  L.  C.  Graton 74 
Utah: 
The  Annie  Laurie  mine,  Piute  County,  by  Waldemar  Lindgren. 87 
Survey  publications  on  gold  and  silver 91 
Copper 93 
General  United  States: 
The  copper  mines  of  the  United  States  in  1905,  by  W.  II.  Weed 93 
Colorado: 
The  Cashin  mine,  Montrose  County,  by  W.  II.  Emmons 125 
Idaho : 
Ore  deposits  in  the  St.  Joe  River  basin,  by  A.  J.  Collier 129 
Virginia: 
Copper  deposits  near  Luray,  by  W.  C.  Phalen 140 
Survey  publications  on  copper 144 
Tin,  quicksilver,  platinum,  etc 146 
Texas : 
Tin  in  the  Franklin  Mountains,  by  G.  B.  Richardson 146 
General : 
Investigation  of  black  sands  from  placer  mines,  by  D.  T.  Day  and  R.  II. 
Richards 150 
Survey  publications  on  tin,  quicksilver,  platinum,  etc 165 
Lead  and  zinc 166 
Nevada: 
A  Nevada  zinc  deposit,  by  H.  F.  Bain 166 
Survey  publications  on  lead  and  zinc 1 70 
Aluminum 171 
Survey  publications  on  aluminum  ores -        171 
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