CONTENTS. 



PART II. 



MINING INDUSTRY. 



Page. 



CHAPTER I. Ore deposits 3G7 



Classification of ore deposits iu general 367 



Leadville deposits 375 



II. Iron Hill group of mines 3SO 



Irou Hill 380 



North Iron Hill 401 



III. Carbonate Hill group of mines 409 



General structure 409 



Southern group of mines 414 



Northern group of mines 429 



IV. Fryer Hill group of mines 445 



General description 445 



Mine workings 455 



R6smu6 489 



V. Other groups of mines 493 



Mines and prospects in the Leadville region 493 



Mines and prospects outside the Leadville district 519 



VI. Genesis of Leadville deposits 539 



Manner of occurrence 540 



Composition of ores 543 



Composition of vein materials 556 



Ores deposited as sulphides 562 



Mode of formation 565 



Origin or source of the metallic minerals 569 



APPENDIX B, BY W. F. HILLEBRAND. 

 CHEMISTRY. 



Tables of analyses and notes on methods employed 589 



Eruptive rocks 589 



Limestones 596 



Ores and vein materials 599 



APPENDIX C, BY ANTONY GUYARD. 

 METALLURGY. 



Argentiferous lead smelting at Leadville 613 



Introduction 613 



Preliminary conditions of smelting 614 



Materials used in smelting 636 



Plant and smelting operations 659 



Products of smelting 692 



Theoretical discussion 731 



Metallurgical plates.. 749 



Central index . 753 



365 



