vi TABLE OF CONTENTS. 



PAGE 



Prime, 46, 47 ; Lottner- Serlo, 47 ; Koehler, 47 ; Gallon, 47 ; schemes 

 partly based on form, partly on origin : J. D. Whitney, 48 ; J. S. 

 Newberry, 48 ; J. A. Phillips, 49 ; schemes largely based on ori- 

 gin: J. Grimm, 50 ; A. von Groddeck, 51 ; R. Pumpelly, 51, 52 ; 

 schemes entirely based on origin : H. S. Munroe, 52, 53 ; J. F. 

 Kemp, 53-55 ; remarks on the above, and discussion of methods 

 of formation, 56-62 ; bibliography, 62-65 42-65 



PART II. THE ORE DEPOSITS. 



CHAPTER I. THE IRON SERIES (IN PART). INTRODUCTORY REMARKS 

 ON IRON ORES. LIMONITE. SIDERITE. 



General literature, 69-70 ; table of analyses, 70 ; general re- 

 marks, 70-73 ; Limonite, Example 1, Bog Ore, 73-75 ; Example 2, 

 Brown Hematite, not Siluro-Cambrian, 75-79 ; Example 2a, Siluro- 

 Cambrian Limonites, 79-84; origin of same, 84-85. Analyses of 

 limonites, 86. Siderite or Spathic Ore, introductory, 86 ; Example 



3, Clay Ironstone, 86-87 ; Example 3a, Black-band, 87-89; Example 



4, Burden mines, 89-91 ; Example 5, Roxbury, Conn., 91 69-91 



CHAPTER II. THE IRON SERIES, CONTINUED. HEMATITE, RED AND 

 SPECULAR. 



Introductory remarks, 92 ; Example 6, Clinton Ore, 92-98 ; Ex- 

 ample 7, Crawford Co., Mo., 99 ; Example 8, Jefferson Co., N. Y., 

 99 ; Example 9, Lake Superior Hematites, 100-113 ; introductory, 

 100-102 ; Marquette district, 102-106 ; Menominee, 107-108 ; Peno- 

 kee-Gogebic, 108-109 ; Vermilion Lake, 110-111 ; Mesabi, 111-113 ; 

 Example 10, James River, Va., 113 ; Example 11, Pilot Knob., Mo., 

 114-116 ; Example lla, Iron Mountain, Mo., 116-118 ; Analyses of 

 Hematites, 118 92-119 



CHAPTER III. MAGNETITE AND PYRITE. 



Example 12, Magnetite beds, 120-127 ; Adirondack region, 

 120-122 ; New York, New Jersey, and Pennsylvania, 123-125 ; North 

 Carolina and Virginia, 125 ; Colorado, 126 ; California, 126-127 ; 

 Example 13, Cornwall, Penn., 127; Example 14, Iron Co., Utah, 

 128 ; Example 15, Magnetite Sands, 128 ; origin of Magnetite de- 

 posits, 129-130; distribution of Phosphorus, 130; Analyses of 

 Magnetites, 131 ; Pyrite, 131-132 ; Example 16, Pyrite Beds, 131- 

 132 ; Statistics of iron ores, 133 120-133 



CHAPTER IV. COPPER. 



Table of analyses of copper ores, 134 ; Example 16, continued, 

 Pyrite Beds, 134-135 ; Ore Knob, N. C., 135 ; Spenceville, Cal., 

 136; Example 17, Butte, Mont., 136-137; Gilpin Co., Colo., 138; 

 Llano Co., Texas, 139 ; Example 18, Keweenaw Point, Mich., 139- 

 143 ; origin of the copper, 141-142 ; Example 19, St. Genevieve, 

 Mo., 143-144; Example 20, Arizona copper, 144-151 ; Morenci, 145 ; 

 Bisbee, 148 ; Globe district, 150 ; Santa Rita, N. M., 150-151 ; Black 



