INDEX 





Collins, J. II., 177 



Mtr. 281 



Columbium, '281 



character of ore bodies, 281 



extraction of, 281 



geographical distribution, 281 



geological horizon, 281 



production of, 308 



properties of, 281 



u-rs of, 281 



Comstock Lode, Nevada, 72, 95 

 Cook, G. H., 190 

 Coolgardite, 53 

 Copper, 135 



character of ore bodies, 139 



chlorination process, 158 



electrolytic process, 158 



extraction of, 157 



geographical distribution, 140 



geological horizon, 157 



in Vermont, 141 



native, 135 



ores of, 135 



metasomatic, 40 

 primary, 35 



origin of ores, 136 



oxidation process, 158 



production of, 295 



properties of, 135 



reduction process, 157 



scrap iron process, 158 



uses of, 159 



Copperfield, Vermont, 142, 143 

 Copper River district, 157 

 Coquimbite, 189 

 Coracite, 279 



Cornwall, England, 32, 177, 181 

 Corundum, 218, 221 

 Cotunnite, 110 

 Covellite, 135 



Cripple Creek, Colorado, 66 

 Crocoite, 110, 230 

 Crook, A. R., 268 

 Crookesite, 283 

 Cryolite, 218, 222, 229 

 Crystal Falls district, 209 

 v Cuprite, 135 



Cuprodescloizite, 276 



Cuprotungstite, 260 



Cuyun:i diMrii ' 

 Cyanide process for gold, S7 

 for silver, KM 



D 



Dana, J. D., 138, 172 

 Daubree, A., 165, 190, 191 

 Daubreelite, 230 

 Deep Creek, Utah, 46 

 Derby, O. A., 248 

 Descloizite, 276 

 Detrital deposits, 47 

 Diaspore, 218 

 Dieulafait, L., 246, 257 

 Dioptase, 135 

 Dip, 9 



Doelter, C., 177 

 Doherty. W. M., 248 

 Dolomitization, 7 



E 



Eckel, E. C., 201 



Elba, Island of, 214 



Embolite, 90 



Emery, 218 



Emmons, S. F., 94, 117, 118 



Enargite, 135 



Erythrite, 235 



Eucairite, 283 



Euxenite, 281 



Fay, A. H., 181 



Faults, 9 



Federated Malay States, 181 



Fergusonite, 281 



Ferrochrome alloy, 233 



Ferromanganese, 255 



Foot wall, 12 



Forschammer, G., 246 



Franklin Furnace, New Jersey, 250, 



259 



Franklinite, 190, 257 

 Freiberg district, 97 



