738 



GEOLOGY AND MINING INDCSTRY OF LEADVILLE. 



asb. We will assume from the nature of tbis fuel tbat its average proportion of 

 moisture is equal to 5 per ceut. aud of gases 3 percent. 



Raw materials Tbe average composition of ore, hematite, dolomite, fuel, asb in 



fuel, aud atmospberic air wbich will be adopted in tbis discussion is the following : 



Component paits. 



Ore. Hematite. Dolomite. Fuel. Ash in fuel. AtmoBpheiic 



Carton 



Gases in fuel. 

 Kitrogen 



OxTgen 



Carbonic acid 



Moisture 



Lead 



Silver 



Metallic iron 



Alumina 



Peroxide of iron a . 

 Peroxide of mangar 



Lime 



Magnesia 



Alkalies 



Silica 



9.53 

 5.58 

 5.53 



23.00 

 0.31 



18.10 



45.83 

 0.10 



4.03 

 2.36 

 3.04 



Asb 



Other constituents b. 



52.50 

 0.50 



0.42 

 0.37 

 0.63 



21.41 

 0.04 



22.20 



10.88 

 0. 30 



4.00 

 0.50 

 2.00 

 56.80 



li-O. oo( 



(lit will be assumed that this peroxide of iron escapes reduction. 



I Sulphur, arsenic, antimony, chlorine, phosphoric acid, &.C., are neglected i 



I subsequent calculatit 



The composition of old slags is not given here, it being unnecessary for tbis dis- 

 cussion. 



Of tbe above chemical constituents the following proportioDal quantities enter into 

 tbe smelting charge, calculated ou tbe basis of averages given in Section V of Table IV: 



Constituents of smelting charge: 



Carbon 



Gases in fuel 



Oxygen 



Carbonic acid 



Moisture 



Lead 



Silver 



Metallic iron 



Alumina 



Peroxide of iron 



Peroxide of manganese . 



Lime 



Magnesia 



Alkalies 



Silica . . , 



9.53 

 6.58 

 5.53 



23.00 

 0.31 



18.10 

 3.99 



26. 533 

 0.985 



1.867 

 0.159 



4.357 

 0.041 



4.03 

 2.36 

 3.04 



0.035 

 0.031 

 0.052 



3.3G0 

 2.129 ! 



0.143 



o.o:8 



0.071 

 2.0J9 



