XII LIST OF PLATES. 



Plate XXXI. Hoisting Appliance in Colorado opposite page . - 513 



XXXIL I^orth Star Hoisting Works do 528 



XXXIII. Colorado Staminng Battery do 648 



XXXIV. Eittinger Table do 670 



XXXV. Georgetown Mines ; Comstock Mine, Snake 



Eiver do 692 



XXXVI. Brueckner's Boasting Cylinder do 610 



XXXVII. CoUom's Ore- Washing Machine .do 621 



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41 



