INDEX. 
497 
Page. 
Iron  Gate,  Va.,  section  at,  figure  showing. .      185 
Iron  Mountain  belt,  Cal.,  mines  of 104-105 
Iron  Mountain  mine,  Cal.,  copper  of 105 
Iron  Mountain  mine,  Mont.,  description  of.  51-52 
Iron  ores,  bibliography  of 187, 189, 201-202 
character  of 180-181, 184-188, 194-200 
development  of 181-182, 187, 194 
occurrence  of 180-189, 194-200 
investigation  of 20-21 
production  of 184, 194 
See  also  Alabama;  California;  Colo- 
rado; Kentucky;  Virginia; 
Utah;  Washington;  Wyoming; 
Clinton  ores;  Oriskany  ores; 
New  River-Cripple  Creek  dis- 
trict; British  Columbia. 
Irving,  J.  D.,  and  Emmons,  S.  F.,  report  of, 
on  Leadville  district 15-16 
Irvona  district,  Pa.,  coal  of 273-274 
Italy,  copper  in,  production  of 94 
Ivie  Creek  Canyon,  Utah,  coal 301 
J. 
Jackson,  George,  gold  discovered  by 36, 38 
Jackson  Diggings,  Colo.,  gold  at 37-38 
Jacob  formation,  clays  of 434-435 
Jagger  coal,  Ala.,  character  of 218 
section  of 218 
James  mine,  Colo.,  coal  of,  sections  of 229 
Jefferson  coal,  character  and  sections  of 219 
Jenney,  E .  M .,  on  lead  deposits 168 
Jerome  district,  Ariz.,  copper  at 99, 103 
Jicanlla  district,  N.  Mex.,  ores  of 84 
Jim  Creek,  N.  Dak.,  lignite  on  and  near 327 
Johannsen,  Albert,    petrographic    descrip- 
tion by 29 
Johnson  mine,  Utah,  coal  of 301 
June  Bug  mine,  Idaho,  description  of 47 
K. 
Katz,  F.  J.,  work  of 199 
Kansas,  glass  sand  in 402-463, 470 
analyses  of 462-463 
glass  making  in 460 
Kawich,  Nev.,  ore  deposits  of 67-68 
Keep  Cool  mine,  Idaho,  ores  of 46-47 
Kelly  Creek,  Wyo.,  gold  on 307-308 
Kemp,  J .  F .,  work  of 159-160 
Kenmare,  N.  Dak.,  lignite  at,  analyses  of. .      323 
Kemmerer,  Wyo.,  coal  at 337 
coal  at,  analysis  of 339-340 
Kemmerer  Coal  Co.,  mine  of 337 
Kendall,  Wash.,  limestone  and  clay  near. . .      379 
analysis  of 379 
Kenova  quadrangle,  Ky.-Ohio-W.  Va.,  coal 
of 261-268 
description  of. 259-268 
geology  of 259-261 
map  of 260 
Kentucky,  Bath  County,  iron  ores  of 180-182 
brick  production  in 427 
clay  mines  in 427 
clays  of 411-421 
analysis  of 411-412,415 
location  of,  map  showing 418 
production  of 426-427 
sections  of 413-411 
Page. 
Kentucky,  coal  of 204, 259-268 
sections  of 262-263, 265-268 
geology  of 417-418 
iron  ores  in 180-181 
map  of  part  of 260 
stoneware  produced  in 426 
work  in 21-22, 204 
Keweenaw  Peninsula,  Mich.,  copper  mines 
of 110 
Keystone  mine,  Cal.,  copper  ores  of 106 
Keystone  mine,  Mont.,  description  of 49 
Keswick,  Cal.,  copper  of 105 
Killdeer  Mountains,  N.  Dak.,  lignite  near..      327 
Kiln  brick,  clay  for,  analyses  of 412 
Kimberley  bank,  Colo.,  coal  of 236 
Kimberley-Watts  region,  Ala.,  coal  in,  sec- 
tion of 219 
Kindle,  E.  M.,  on  iron  ores  of  Bath  County, 
Ky 180-182 
work  cf 21 
Klondike,  Mo.,  glass  sand  at 466-467 
glass  sand  at,  analyses  of 456-457 
Knight,  Wyo.,  oil  well  near 345 
Knowlton,  F.  II.,  fossils  determined  by 281 
Knox  limestone,  occurrence  of 173 
Kroupa,  R .  J .,  development  by 370 
L. 
107 
La  Forge,  M.  L.,  on  Georgia  copper 
La  Plata  formation,  occurrence  and  charac- 
ter of  125-126 
La  Sal  Mountains,  reconnaissance  in 18, 125 
Lacey-Buek  Iron  Co.,  mines  of . .  - 177 
Lake  Pend  Oreille  district,  copper  in 47-48 
history  of 46-47 
mines  of,  description  of 46-47 
production  of 47 
Laketon,  Ky .,  clay  near,  analysis  cf 420 
Lakeview  district,  Idaho.      See  Lake  Pend 
Oreille  district. 
Lakes,  Arthur,  on  General  Thomas  mine .  .        57 
Lake  Superior  district,  iron  ores  of 20-21 
Laramie,  Wyo.,  gypsite  near 405 
Lamartine  mine,  Colo.,  ores  of 37-38, 40 
Lake  Superior,  copper  ores  of 109-111 
copper  ores  of,  production  of 109 
smelting  of 96 
Landes,  H.  C,  on  cement  resources  of  Wash- 
ington   377-383 
work  cf 160 
Langley ,  B .  F .,  gold  discovered  by 36 
Laramie  basin,  Wyo.,  bentonite  in 447-448 
Laramie  district,  Wyo.,  gypsum  of 404-405 
Laramie  formation,  coal  and  lignite  in..  227-228, 
239, 283, 290, 292, 302-307, 311, 317-330 
coal  and  lignite  in,  analysis  of 341 
description  of 291-293 
occurrence  of 317-321 
sections  of 317-320 
Larsen  mine,  Utah,  coal  of 300 
analysis  of 294 
Lay  district,  Colo .,  coal  of 235 
Lazeart  mine,  Wyo.,  coal  cf 338 
coal  of,  analysis  of 339 
Leaching,  methods  of 127 
Lead,  bibliography  of 170 
occurrence  of 37, 46-47, 52, 79-80, 84, 132 
Lead-silver  ores,  description  of 133-134 
