712 



GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



Analysis No. XXXIII is that of a sample of chamber and flue dust from the Ohio 

 and Missouri smelter. This dust had a reddish-brown tinge, due to peroxide of iron. 



Analysis No. XXXIV is that of a mixture of equal parts of flue and chamber dust 

 from the American, California, Gumming & Finn, Grant, La Plata, and Billing & 

 Eilers smelters. The sample thus formed had a blackish color, due chiefly to fine char- 

 coal dust. 



ANALYSES XXXIII AND XXXIV. CHAMBER DUST. 



Elementary. 



