INDEX. 
499 
Page. 
Manganese,  investigation  of 21 
Manganese  and  iron,  papers  on 172-202 
Manning's  ranch,  N.  Dak.,  lignite  near 327 
Marble,  analyses  of 382-383 
Mary   Lee  coal,  occurrence  and  character 
of 215-217 
sections  of 216 
Maryland,  glass  sand  from 461 
Marysvale,  Utah,  gold  mines  at 19,90 
Massachusetts,  clays  of 432-441 
clays  of,  character  of 434-435 
description  of -. 435-441 
geology  of 432-434 
Mayfield,  Ky.,  clay  at,  analysis  of 421 
Medora,  N.  Dak.,  lignite  near 323-327 
section  at 317 
Mercury,  bibliography  of 165 
occurrence  of 90, 388 
Metalliferous  ores.    See  Ores,  metalliferous. 
Mica,  bibliography  of 484 
Michigan,  copper  in 109-111 
gold  and  silver  in 95 
production  of 93, 97, 109 
Michigan-Wyoming  Oil  Co.,  coal  of,  analy- 
sis of 339 
Midland  Glass  Co.,  Kans.,  glass  making  by.      460 
Midway,  Utah,  ozokerite  near 369, 371 
Mikkleson,  N.  Dak.,  lignite  near 326 
Milburn,  Ky.,  clay  near,  analysis  of 421 
Miles  City,  Mont.,  lignite  near 329 
Mill  Iron  ranch,  Mont.,  section  at 320 
Miller  Canyon,  Utah,  coal  of 299 
Miller  Gulch,  Colo.,  coal  of,  analysis  of 238 
Mineral  deposits,  papers  on 7 
Mineral  resources,  publications  on,  improve- 
ment of 16 
Mineral  water,  analysis  of 315 
occurrence  of 314-315 
Mineral  wax.     See  Ozokerite. 
Minerals,    nonmetalliferous,    investigation 
of 20, 22-24 
Minnie  D.  mine,  Colo.,  description  of 32,33 
section  at. 32 
Minot,  N.  Dak.,  lignite  of,  analysis  of 323 
Miocene  sandstone,  coal  in 223 
Mississippi  Valley  basin,  glass  sand  in. . .  459-475 
lead  and  zinc  ores  in 168-169 
work  in 17, 24 
Missoula  River,  Mont.,  mines  on 51-52 
Missouri,  glass  making  in 460,  466-469 
glass  sand  in 461,  464,  469-470 
analyses  of 456-457,  462-463 
Missouri  Silica  Co.,  glass  sand  of 468 
Mogollon  district,  N.  Mex.,  copper  in 118 
Monazite  in  black  sands,  occurrence  of...  152-156 
Monero  district,  N.  Mex.,  coal  of 247-248 
coal  of,  analyses  of 258 
sections  of 247-248 
Monitor  mine,  Idaho,  ores  of 135 
Monkers  &  Mather's  coal  mine,  Wyo.,  sec- 
tion of '. 307 
Montana,  coal  in 205, 269-270 
coal  in.    See  also  North  Dakota-Mon- 
tana lignite  area. 
copper  in . . .   111-115 
gold  and  silver  in 95, 111-112 
Page 
Montana,  copper  in,  production  of 93, 111-113 
copper  in.     See  also  Butte. 
economic  features  of 41-52 
gravels  in 44 
lignite  in.    See  North  Dakota-Montana 
lignite  area. 
map  of 42 
m  ineral  resources  of 44-45, 48-52 
placers  in 44 
rocks  in 41-44 
silver  lead  in 48-52 
work  in 18, 22-23, 205 
Montana  formation,  coal  in 227-239 
coal  in,  analyses  of 341 
Montana  Fuel  and  Iron  Co.,  coal  of 270 
Montana-North  Dakota   Lignite   area.     Set 
North  Dakota-Montana,  lignite 
area. 
Montana  Standard  Co.,  mines  of,  descrip- 
tion of 51 
Montauk  drift,  clays  of 435 
Montezuma,  Nev.,  ore  deposits  at 58-59 
Montezuma  Mountain  district,  Colo.,  coal 
of 246-247 
section  of 247 
Monument  River,  Mass. ,  clays  on 440 
Monzonites,  gold  in 56-57 
Mooyie  River,  Idaho,  gold  placers  on 44 
Morague  Mountain,  Ala.,  iron  ores  on 177-178 
Morenci,  Ariz.,  copper  ores  of 101, 102 
copper  ores  of,  treatment  of 95 
See  also  Clifton-Morenci  district. 
Morgan's  ranch,  N.  Dak.,  lignite  near 326 
Morris,  Ala.,  coal  near,  sections  of 216,217 
Morrison  formation,  section  of 313 
Morrison  mine,  Utah,  coal  of,  analysis  of . .       284 
coal  of,  section  of 283-284 
Moshannon  basin,  Pa.,  coal  of 271, 273 
Mother  lode,  Idaho  description  of 138 
Mountain  Valley,  Ark.,  clays  from,  analyses 
of 409 
Mount  Diablo  Range,  Cal.   coal  in 224-225 
coal  in,  analyses  of 224 
geology  of 223-224 
section  of,  figure  showing 224 
Mouse  River  Lignite  Co.,  lignite  of,  analyses 
of 323 
Muddy  Creek,  Utah,  section  of 291 
Muddy  Run  district,  Pa.,  coal  of 273 
Munn,  M.  J.,  work  of 204 
N. 
Nacimiento  district,  N.  Mex.,  coal  of 250-251 
coal  of,  section  of 250 
copper  of 118 
Napoleon  mine,  Cal.,  copper  ores  of 106 
Nebraska,  volcanic  ash  from,  analysis  of. . .       477 
Needle  Mountains  quadrangle,  mines  of 18,25 
rocks  of 25-26 
Neodesha,  Kans.,  glass  making  at 460 
Nevada,  copper  in 116-117 
copper  in,  gold  and  silver  in 95, 116 
Esmeralda  County,  mine  in 57-65 
Nye  County,  mine  in 63-72 
southwestern  part  of,  economic  condi- 
tions in 54 
