SMELTING CHaEGES AT INDIVIDUAL SJIELTEES. 

 No. 3. 



657 



Charge, 640 pounda. Smelting charge, 760 pounds, 

 No. 4. 



Charge, G35 pounds. Smeltiug charge, 755 pounds. 



lu the proci'(liii<;' siiieltiii;j; charges the proportions are — 



Diitii relative to the con.sninptiou of ore, fluxes, and fuel not being obtainable at 

 this smelter, one of tbc most important in the camp, the construction of an average 

 smelting charge is imi)ossible; but the general rule observed at the works in the com- 

 position of the smelting charges is the followiug: The ore-beds are made to contain 

 equal parts of gangne and metallic iton, 20 to lia per cent, of each, and from IG to 25 

 per cent, of lead, about six pounds of lead for one ounce of silver. When the proper 

 tion of gangue and iron is equal in the ore-bed, the ore is mixed with 10 per cenr. of 

 dolomite; but when gangue is in excess hematite is added in sufBcient quantity to 

 make the balance. At this smelter the slags obtained are called acid slags. The fuel- 

 shovels used at this and other smelters are drawn to scale in Figs. 1, 2, and 3, and the 

 ore and slag shovels are shown in Figs. 4 and 5, Plate XLIV. 



Smelter I. 



Smcltiny chanji-g made in Jur/iist, l^.ULl 

 liter Ibo ore-bed was made witb Morning Star, Dunkin, Iron i 



(At tbis 



, and Agassiz ore.) 



Ore, 526 pounds. 



Flux, 273 pounds. 



Oro-bed 263 Dolomite ... 60 



Virginius 156 j Ilematite ... 67 



Cbrj-solitc (sand). 107 I Old slags 140 



Fuel, 147.5 or 137 pounds. 



Cbarcoal... 60.; 

 Coke e7 



Charge (oie and flux), 7S9 ponnds. Smelting charge (ore, flux, and fuel), 946.5 or 930 pouud.'i 

 MON. XII 42 



