TABLE OF CONTENTS ix 



CHAPTER VIII 



USEFUL METALS CONTINUED (GROUP IV) 



PAOES 



COBALT, NICKEL, MANGANESE, ZINC 235-267 



Ores of cobalt, 235. Origin of the ores, 235. Geographical 

 distribution, 236. Uses, 237. Ores of nickel, 238. Origin 

 of the ores, 238. Character of the ore bodies, 24 1 . Geograph- 

 ical distribution, 242. Sudbury, Ontario, 242. Uses, 244. 

 Manganese, 245. Ores of manganese, 246. Origin of the 

 ores, 246. Character of the ore bodies, 248. Geographical 

 distribution, 250. Cuba, 252. Uses, 254. Zinc, 256. Ores 

 of zinc, 257. Origin of the ores, 257. Character of the ore 

 bodies, 259. Geographical distribution, 259-264. The Ap- 

 palachian belt, 259. The Central States, 260. The Cordil- 

 leran region, 263. Geological horizon, 264. Methods of 

 extraction, 265. Uses, 266. 



CHAPTER IX 

 THE RARE METALS 



MOLYBDENUM, TUNGSTEN, TITANIUM, ZIRCONIUM, VANADIUM, 



URANIUM, COLUMBIUM, TANTALUM, SELENIUM, TELLURIUM . 268-286 

 Molybdenum, 268-269. Tungsten, 269-271. Titanium, 

 271-274. Zirconium, 274-276. Vanadium, 276-278. Uran- 

 ium, 278-281. Columbium, 281. Tantalum, 282-283. Sele- 

 nium, 283-284. Tellurium, 285-286. 



CHAPTER X 



ECONOMICS 287-309 



Gold, 287. Imports and exports, 288. Silver, 289. Imports 

 and exports, 290. Platinum, 291. Lead, 292. Mercury, 293. 

 Bismuth, 294. Copper, 295. Cadmium, 296. Arsenic, 297. 

 Antimony, 297. Tin, 298. Iron, 299. Imports and exports, 

 300. Aluminum, 301. Chrome iron ore, 301. Cobalt, 302. 

 Nickel, 302. Manganese, 303. Zinc, 304. Rare metals, 305- 

 309. 



INDEX . 311-320 



