petroleum, 132, 133, 135
salt, 294
zinc, 215

Kaolin, 85, 398

Katamorphism, defined, 27, 57

Katanga, Belgian Congo, cobalt, 255
copper ores, 205

Kennecott, Alaska, copper ores, 36, 41, 47, 49, 200-201

Kentucky, asphalt and bitumen, 152, 153
coal, 117
fluorspar, 194
marble, 83
petroleum, 133
sandstone, 84

Kimberley, South Africa, diamonds, 291-292

Knox dolomite, Tennessee, zinc ores, 219

Korea, gold, 222
graphite, 280, 282
iron, 160
molybdenum, 186
tungsten, 183

Lacroix, Morris F., and Brooks, Alfred H., 404

Lake Superior copper ores, 36, 52, 200, 206

Lake Superior copper, silver, gold ores, occurrence in a metallogenic
province, 308

Lake Superior iron ores, 8, 47, 55-56, 160, 162, 163, 167-170, 309,
312-313

Lake Superior region, iron ore exploration in, 317-318, 323-326

Land grants in United States, retarding effect on exploration, 349

"Land-plaster", 100

Laterites, 172-173

Laws relating to mineral resources, 342-358

Lawton region, Pennsylvania, coal, 117

Lead and zinc, Wisconsin, equated income method of taxation, 335-336

Lead ores, 36-50, 54-55, 209-213, 307, 308, 313-314, 361, 397

Leadville, Colorado, bismuth, 253
lead and zinc ores, 212, 216, 219-220

Leasing law, on public lands in western United States, 348

Leith, C. K., 323

Leith, C. K., and Mead, W. J., 45

Leith, C. K., and Van Hise, C. R., 56, 324

Lesher, C. E., and Smith, George Otis, 371, 372, 373, 375

Lignite, 118, 120, 122, 124
German development of, 379, 402

Lime, 82, 99-100, 397

Limestone, 15, 17, 23, 82-83, 89-90, 91

Lincolnshire district, England, iron ores, 161

Lindgren, W., 43

Lipari Islands, Italy, pumice, 268

Lithosphere, principal elements of, 13
principal minerals of, 14-16
principal rocks of, 16-17

Litigation, use of geologists in, 349-355, 357-358

Lode, application of legal term to diverse mineral deposits, 350

Long-wall system of coal mining, conservational aspect, 368
subsidence of overlying ground and resulting litigation, 357, 417

Longwy, France, iron ores, 161

Lorraine, iron ores, 52-53, 161-162, 163, 166, 364, 402-403
phosphate from Thomas slag, 104

Loughlin, G. F., Butler, B. S., and Heikes, V. C., 44, 55, 230

Louisiana, natural gas, 151
petroleum, 132, 133, 135