398

Precious stones, 289-293, 398

Primary ore deposits, use of term, 32

Primary ores, relation to depth, 49

Propylitic alteration, 39, 236

Protore, use of term, 33, 48

"Proximate" analyses of coal, 120

Public domain, laws relating to ownership of mineral resources on,
343-344

Pulpstones, 269

Pumice, 267, 268, 270, 398

Puzzolan cement. See Cement.

Pyrite, 100, 107-109, 307, 386, 397

Pyrophyllite, 299

Quartz, as geologic thermometer, 38
geologic occurrence, 16, 38-39, 43, 45, 47, 168-169, 196
production and use, 84, 267, 269

Quartzite, 84, 91

Quebec, Canada, asbestos, 270-272
magnesite, 193
mica, 286

Quebec, laws relating to ownership of mineral resources, 344

Queensland, Australia, arsenic, 250

Quicksilver ores. _See_ Mercury ores.

Radium ores, 55, 263-266, 397

Railway construction, application of geology to, 417-418

Rambler, Wyoming, occurrence of platinum, 239

Ransome, F. L., 33, 208, 230

Ray, Arizona, copper ores, 33, 47, 48, 198, 203, 208

"Red Beds" copper ores, 9, 206

Registration, public, of drilling records, 305-306

Regulus, 247

Reparations Committee, 387, 393, 402

Replacement, metasomatic, 24

Reserves of mineral resources, 65-66, 359-363, 393-395
_See also_ under individual resources.

"Resource cost" of coal, reduction of in interests of conservation,
334, 375

Rhode Island, coal, 117
graphite, 281

Rhodesia, asbestos, 272
chromite, 178-179

Ries, H., and Watson, T. L., 413

Rio Tinto, Spain, copper ores, 204
pyrite, 108

Road building, application of geology to, 90-91, 418

"Rock flour," defined, 95

Rock slides, 78, 415-417

Rocks, common, as mineral resources, 80-84

Rocky Mountain region, coal, 117
petroleum, 132, 135

Room-and-pillar system of coal mining, modification for conservational
purposes, 368-369

Rottenstone, 267, 269

Roumania, graphite, 280
petroleum, 128, 129

Royal Ontario Nickel Commission, 181

Royalties on coal, reduction of in interests of conservation, 334, 375

Rubies, 289, 291-292

Russia, asbestos, 270-271, 272
cement, 87
chromite, 178-179
coal, 115, 127
copper, 197-198
gold, 222
iron, 155, 160-161, 163
manganese, 174-176
mercury, 256, 258
oil shales, 151
petroleum, 128-120, 137