294 



INDEX. 



Iron ore localities : 

 Virginia, 77-82. 

 Clinton ore, 94. 

 Specular, 113. 

 West Virginia, 88. 

 Clinton ore, 94. 

 Oriskany ore, 98. 

 Wisconsin, Clinton ore, 92. 



Menominee district, 107, 108. 

 Penokee - Gogebic district, 



108, 109. 

 Wyoming, 89. 

 Iron ore, pyrite, 131, 132. 



Red and specular hematite, 92- 



119. 

 Iron ores, origin of, 278. 



Siluro-Cambrian limonites, 79-85. 

 Spathic, 86-91. 

 Statistics, 133. 

 Swedish lakes, 75. 

 Table of and compositions, 70. 

 Irving and Van Hise on the Marquette 



district, 101, 102. 

 Origin of the ores, 106. 

 Irving, R. D., cited on Silver Islet, 



202. 



On replacement, 33. 

 Penokee-Gogebic district, 109. 

 Ishpeming, Mich., gold, 253. 

 Isle Royale, Lake Superior, 139, 141, 



143. 



Izard limestone, 265. 

 Jackson Co., N. C.. nickel, 271. 

 Jacque Mountain, Summit Co., Colo., 



211. 



Jackson, Ore., nickel, 271. 

 James River, Va., specular ores near. 



113. 

 Jasper Co. (Mo.) zinc and lead mines, 



* 167. 



Jay ville iron mines, New York, 122. 

 Jefferson Co., Mont., 219. 

 Jefferson Co. (Mo.) lead and zinc 



mines, 165. 

 Jenney, W. P., cited on Arkansas 



silver mines, 201. 

 On lateral enrichments, 37. 

 On lead ores of southeastern Mis- 

 souri, 159. 

 On lead and zinc mines of the 



Mississippi Valley, 164. 

 On mines of Mississippi Valley, 



276. 



On the Head Center mine, Tomb- 

 stone, Ariz., 31. 



On zinc and lead mines of south- 

 western Missouri, 170. 

 Joints defined, 12. 



Joplin (Mo.) zinc and lead mines, 

 166-171. 



Josephine Co., Oregon, 240. 



Juab Co., Utah, 225. 



Julien, A. A., action of organic acids 



on rocks, 21. 

 Cited on the origin of magnetite, 



130. 



Kansas, nickel, 271. 

 Kaolin ization at the Comstock Lode, 



235. 



Kelley Lode, New Mexico, 181. 

 Kemp, J. F., scheme for the clas^ifi- 



cation of ore deposits, 53-55. 

 On Missouri lead deposits, 159. 

 Kentucky, lead and zinc ores of Liv- 

 ingston Co., 165. 

 Clinton ore, 93. 

 Limonite, 77, 78. 

 Limonite or brown hematite ores, 



77, 78. 



Spathic ores, 88. 

 Kern Co. (Cal.) antimony, 259. 

 Kerr, W. C., on North Carolina gold, 



252. 

 Keweenaw Point (Mich.) copper, 139- 



143. 

 Kimball, J. P., cited on the Burden 



mines, New York, 89. 

 On origin of iron ores, 278. 

 King, C., on the Comstock Lode, 233, 



234. 



Kinahan, J. H., cited on joints, 13. 

 Kittitas Co., Washington, gold, 238. 

 Klausen in the Austrian Tyrol, veins 



illustrating lateral secretion, 



31, 32. 



Knob of igneous rock defined, 11. 

 Koehler, G., cited on faults, 19. 



Scheme of classification of ore 



deposits, 47. 

 Lahontan, Lake, 230. 

 Laccolite defined, 11. 

 Lac la Belle, Keweenaw Point, 142. 

 Lager defined as contrasted with 



"F16tz"and "Gang," 43. 

 Lakes, A., cited on Aspen, Colo., 189. 

 Lake Cham plain iron region, 120. 



Magnetite sands, 128. 

 Lake Co., Colo., 211. 

 Lake of the Woods, gold district, 256. 

 Lake Superior gold region, 256. 

 Iron ore districts, 100-113. 

 Mines, 276. 

 Lake Valley (N. M.) lead-silver ores, 



181. 



Lancaster Co. (Penn.) chromite, 261. 

 Lander Co., Nev., 232. 



Antimony mines, 259. 

 Lander Hill, Nev., 232. 

 Lane's Mine, Monroe, Conn., 260. 

 La Plata Co., Colo., 205. 



