738 



GEOLOGY AND MINING INDCSTKY OF LEADVILLE. 



ash. We will assume from the nature of this fuel that its average proportion of 

 moisture is equal to 5 per cent, and of gases 3 per cent. 



Raw materials The average composition of ore, heoiatite, dolomite, fuel, ash in 

 fuel, and atmospheric air which will be adopted in this discussion is the following : 



a It will be assumed that this peroxide of iron escapes redaction. 



'< Sulphur, arsenic, antimony, chlorine, phosphoric acid, &<:., are neglected in subsequent calculation*. 



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

 cussion. 



Of the above chemical constituents the following proportional quantities enter into 

 the smelting charge, calculated on the basis of averages given in Section V of Table IV: 



