622 



GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



TABLE II Contiuued. 

 III. ASSAYS MADE AT MESSRS. CUMMING & FINN'S SMELTER, JULY, 1880. 



IV.-ASSAYS MADE AT CUMMING St. FINX'S SMELTER, AUGUST, 1880. 



V.-ASSAYS MADE AT THE HARRISON REDUCTION WORKS, JULY, 1880. 



At the smelters, silica, or rather that mixture of silica and refractory silicates 

 insoluble in acids, and known as gangue, is determined, as well as the per cent, of iron. 



