XXII GEOLOGY AND MINING INDUSTRI OF LEADVILLE. 



Page. 

 Tables of analyses and notes on methocls employed — Continued. 

 Ores and vein materials — Continued. 



Table X. Various ores, vein materials, and country rocks 602 



Table XI. Alteration products of porphyry "(kaoliu and Chinese talc) 603 



Table XII. Alteration products of galena and pyrite (basic sulphates) 606 



Table XIII. Miscellaneous alteration products 607 



Table XIV. Assays of ores, vein materials, and country rocks 608 



Appendix C, by Antony Guyakd. 



METALLURGY 



Introduction" •'13 



Section I. 



Preliminary conditions of smelting 614 



Leadville — Its situation 614 



Location and output of its mines, Table I 615 



Ores — Description of chief ores— Analyses of carbonate, chloride, and average ores— Assays 



of ores from principal mines. Table II 616 



Smelting works — Their location, cost of plant. Table III, and general arrangement 685 



Ore buying — Its method 627 



Sampling and sampling works 628 



Crushing and crushers used 629 



Assaying— Apparatus and methods ... 632 



Section II. 



Materials used in smelting 636 



General considerations 636 



Statistics of Leadville smelters, Table IV 637 



Construction materials 641 



Fuels and fluxes 641 



Coke— Analyses VII and IX 641 



Charcoal 642 



Dolomites — Analyses X to XIX 643 



Limestone — Analj'sis XX 64G 



Hematite — Analysis XXI 646 



Ore beds — Their composition, Table V 048 



Smelting charges at individual smelters 649 



E^sunvi? and general discussion of smelting charges 659 



Section III. 



Plant and smelting operations 6C<9 



Smelting plant in general — Furnaces and blast apparatus, Table VI 659 



Smelting operations in general— Drying, blowing-in, charging, barring-down, smelting of 

 dusts, tapping of clay, matte and speiss, ladllng-out of bullion, watching and blow- 

 ing-out - ■ 664 



Cost and profits of smelting 668 



Plant and operations of individual smelters 669 



Section IV. 



Products of smelting 692 



Bullion — Its sale — Shipment, Table VII — Analyses and assays — Skimmings- Losses — Bull- 

 ion capacity of smelters, Table VIII— Bullion production. Table IX 692 



