496 
INDEX. 
Page. 
Green   River,   Utah,   coal   on.    See   Book 
Cliffs  coal  field. 
Griswold,  W.  T.,  work  of 23 
Grouse  Mountain,  Mont.,  lead-silver  mines 
at,  description  of 49 
Gunnison  River,  Colo.,  gypsum  on 401-403 
gypsum  on,  sections  of 402-403 
Gwin  coal,  Ala.,  occurrence  of 214 
Gypsite,  occurrence  of 405 
Gypsum,  analysis  of 314, 405 
bibliography  of 406 
investigation  of 24 
occurrence  of 309, 313-314, 401-405 
sections  of 313, 402-403 
See  also  Colorado;  Wyoming;  Laramie 
district;  Uncompahgre  region. 
Gypsum  and  plasters,  bibliography  of 406 
papers  on 401-405 
II. 
Hachita  Range,  N.  Mex.,  rocks  of 83 
1 1  adley,  Alaska,  copper  mine  at 97-98 
Hahns  Teak  gold  field,  Colo.,  copper  at 34 
cross  section  of,  figure  showing 29 
description  of 28-34 
developments  at 32-33 
gold  of 31-32 
hydraulicking  at 31, 33 
geologic  map  of 28 
map  of 30 
placers  of 31  32 
railroad  construction  near 33 
rocks  in 29-31 
study  of 17 
veins  in 32  33 
Hamilton  mine,  N.  Mex.,  ores  of 81 
Hams  Fork,  Wyo.,  coal  on,  analyses  of 340 
Hams  Fork  coal  field,  Wyo.,  work  in 22 
Hancock,  Md.,  sand  quarries  at 475 
Happy  Hooligan  mine,  description  of 72 
Harder,  E.  C,  work  of 199 
Harkness,  Tenn.,  shales  at,  analyses  of 376 
I  la  nay  Creek,  Wyo.,  gypsite  on 405 
Hartville,  Wyo.,  iron  ores  near...  194-195,199-200 
Harwich  region,  Mass.,  clays  of 439 
Hayden  Gulch,  Colo.,  coal  of 234 
Hayes,  C.  W.,  introduction  by 7-13 
work  of 1 74.  203 
Heart  River,  N.  Dak.,  lignite  on,  analysis  of.      323 
Hematite,  occurrence  of 183, 195 
Hess,  F.  L.,  on  magnesite  deposits  of  Cali- 
fornia    385-392 
work  of 160 
Hickman,  Ky.,  clays  near,  analysis  of 421 
Hidden  Treasure  mine,  Idaho,  ores  of 46-47 
High  Knob,  Va.,  copper  at 142 
Highland  Light,  Mass.,  clays  at 434-436 
Hilliard  Flat,  Wyo.,  petroleum  wells  at  and 
near 342-345,  349 
petroleum  wells  at  and  near,  relations 
of  Spring  Valley  wells  and,  sec- 
tion showing 350 
Hodges  Pass,  Wyo.,  coal  at  and  near 337-338 
Holdcn,  R.  J.,  on  brown  ores  of  New  River- 
Cripple  Creek  district,  Va 190-193 
work  of 21, 183 
107    109.  134    13li 
Idaho, copper  in 
copper  in,  gold  and  silver  in 95 
occurrence  of 47-48 
production  of 93, 107 
economic  features  of 41-52 
gold  in 136-138 
gravels  in 44 
lead-silver  ores  in 133-134 
map  of 42 
mineral  resources  of 44-48 
placers  in 44 
rocks  in 41-44 
silver  lead  in 45-48 
volcanic  ash  from,  analysis  of 477 
work  in 18-24 
Idaho  Springs  mining  district,  Colo.,   de- 
scription of 35-40 
faulting  in 37 
geology  of 35-38 
hot  springs  in 37 
investigation  of 18 
minerals  at 38 
placer  deposits  of 36-38 
ores  of 38  40 
rocks  near 35-38 
Igneous  rocks,  importance  of 168-169 
occurrence  and  character  of.t 29-30, 
42,44,55,78,132 
Illinois,  glass  sand  from : 461,464-465 
glass  sand  from,  analyses  of 456-457 
Imperial  Copper  Co.,  mine  of 102 
Independence,  Kans.,  glass  making  at 460 
Indian  Hill,  Mass.,  clays  at 440-441 
Indiana  Co. ,  clays  of 444 
Indio,  Ala.,  coal  at,  section  of 219 
I  ridium,  occurrence  of 150 
Iridosmium,  occurrence  of 150 
Iron,  pig,  cost  and  production  of 184,203 
Iron  and  manganese,  papers  on 172-202 
Iron  Cap  mine,  Montana,  description  of 49 
Iron  Gate,  Va.,  iron  ore  from,  analysis  of. .      188 
Page. 
Hollow  Rock,  Tenn.,  clay  at 419 
Holmes,  J.  A.,  work  of 203,206 
Hope,  Idaho,  copper  near 48 
Hopewell  district,  N.  Mex.,  ores  of 81 
Horse  Canyon,  Utah,  coal  of 295 
coal  of,  analysis  of 294 
Horse  Mountain,  Va.,  iron  at,  development 
of 187-188 
Horswell,  M.  J.,  aid  of 224 
Horton,  F.  W.,  work  of 157 
Hosta  Butte  district,  N.  Mex.,  coal  of 252-254 
coal  of,  analysis  of 258 
sect  ions  of 253-254 
Hot    Springs    Mountain,    Ark.,    clays    on, 
analysis  of 407,409 
Howard  ranch,  N.  Dak.,  lignite  near,  sec- 
tion of 328 
Hughes  siding,  Ala.,  coal  near,  section  of. . .      220 
Huntington  Canyon,  Utah,  coal  of 299-300 
coal  of,  analyses  of 294 
section  in 299 
Hutchinson  mine,  Colo.,  coal  of,  analysis  of.      230 
Ilutton  Lakes,  Wyo.,  bentonite  at 447 
