314 



INDEX 



G 



Gangue, 1 



Garnierite, 238 



Gautier, A., 165 



Geikie, A., 194 



Genth, F. A., 178 



Genthite, 238 



Georgia-Alabama district, 223 



Georgetown district, Colorado, 70 



Gersdorffite, 238 



Gibbsite, 212, 222 



Globe, Arizona, 152 



Gold, 33 



chlorination process, 88 



cyanide process, 87 



deposits, classification of, 58, 



59, 60 

 metasomatic, 40 



detrital, 49 



electrolytic process, 88 



extraction of, 86, 87, 88 



geographical distribution, 60 



geological horizon, 83 



occurrence of, 52 



ores of, 52 



origin of ores, 53 



placer mining, 84 



primary veins, 34 



production of, 287 



properties of, 52 



sodium thiosulphate process, 88 



uses of, 89 



Goldfield, Nevada, 72 

 Goslarite, 257 

 Gossan, 4, 5 

 Gothite, 190, 193 

 Gowganda, Ontario, 97 

 Graton, L. C., 179 

 Greenockite, 162 

 Greisenization, 170 

 Grlilingite, 286 

 Guanajuatite, 131, 283 

 Gumbel, C. W., 247 

 Gummite, 259 



H 



Hade, 9 

 Hague, A., 72 



Hall, James, 201 



Hancock, E. T., 62, 117, 154, 208, 



261 



Hanging wall, 12 

 Hanover, New Mexico, 212 

 Hausmannite, 246 

 Hawes, G. W., 190 

 Haworth, E., 136 

 Hayes, C. W., 219, 223, 224 

 Hematite, 190, 195 

 Hess, F. L., 181, 270, 273, 282, 295 

 Hessite, 52, 90, 285 

 Hobart, F., 289 

 Homestake district, 62, 63, 64 

 Hornstein, F. F., 190 

 Horse, 15, 16 

 Hubnerite, 269 

 Hussak, E., 190 

 Hydatogenesis, 33 

 Hydrozincite, 257 



Iddinga, J. P., 72 



Igneous rocks, composition of, 3 



Ilmenite, 273 



Ilmenorutile, 273 



lodyrite, 90 



Tola, Kansas, 265 



Iridium, 106 



Iridosmine, 107 



Iron, 188 



Appalachian belt, 197 

 character of ore bodies, 195 

 classes of minerals, 189 

 extraction of, 215 

 geographical distribution, 196 

 geological horizon, 205 

 impurities in, 196 

 metasomatic deposits, 38, 201 

 native, 189 



ores and minerals, 189 

 origin of ores, 190 

 precipitated deposits, 41 

 production of, 300 

 properties of, 188 

 residual enrichment, 201 

 sedimentary origin, 201 

 uses of, 216 



