viii TABLE OF CONTENTS 



PAGES 



Origin of ores, 126. Character of ore bodies, 127. Geo- 

 graphical distribution, 128. Geological horizon, 129. 

 Methods of extraction, 129. Uses, 130. 



CHAPTER V 



USEFUL METALS CONTINUED (GROUP II, SUBGROUP A) 



BISMUTH, COPPER, CADMIUM 131-163 



Ores of bismuth, 131. Origin of the ores, 131. Character of 

 the ore bodies, 132. Geographical distribution, 132. 

 Methods of extraction, 133. Uses, 133. Ores of copper, 135. 

 Origin of the ores, 135-138. Classification of the origin of 

 copper ores, 138. Character of the ore bodies, 139. Geo- 

 graphical distribution, 140-157. The Appalachian belt, 140. 

 Lake Superior region, 142. The Cordilleran section, 145. 

 Arizona, 150. The Pacific Coast belt, 153. Bingham, Utah, 

 154. The Alaskan district, 155. Geological horizon, 157. 

 Methods of extraction, 157-159. Uses, 159. 'Cadmium, 

 160-163. 



CHAPTER VI 

 USEFUL METALS CONTINUED (GROUP II, SUBGROUP B) 



ARSENIC, ANTIMONY, TIN 164-187 



Ores of arsenic, 164. Origin of the ores, 164. Geographical 

 distribution, 165. Methods of extraction, 167. Uses, 168. 

 Ores of antimony, 171. Origin of the ores, 171. Geographical 

 distribution, 172. Methods of extraction, 173. Uses, 174. 

 Tin, 176. Ores of tin, 177. Geographical distribution, 

 179-184. The Appalachian belt, 179. The Black Hills dis- 

 trict, 180. The Cordilleran section, 180. The Pacific Coast 

 belt, 180. The Alaskan belt, 181. Foreign countries, 181. 

 Methods of extraction, 184. Uses, 185. 



CHAPTER VII 



USEFUL METALS CONTINUED (GROUP III) 



IRON, ALUMINUM, CHROMIUM 188-234 



Ores of iron and iron minerals, 188-189. Origin of iron 

 minerals, 190-194. Character of the ore bodies, 195. Impur- 

 ities that injure iron, 196. Geographical distribution, 

 196-215. The Appalachian district, 196. Metasomatic 

 replacement deposits, 201. Residual limonites, 202. Gossan 

 limonites, 204. Lake Superior district, 204-210. The Cor- 

 dilleran section, 210. Hanover, New Mexico, 212. Geo- 

 logical horizon, 215. Methods of extraction, 215. Uses, 216. 

 Ores of aluminum, 218. Origin of ores, 219. Character of 

 ore bodies, 221. Geographical distribution, 222. Methods of 

 extraction, 225. Uses, 225. Chromium, 230-234. 



