652 



GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



SMELTER C. 



Smelting charges made in August, 1880. 

 No. 1. 



Charge (ore ami flux), 4G3 pounds. Smelting charge (ore, flux, ami fuel), 563 pounds. 



No. 2. 



Charge, 463 pounds. Smelting charge, 563 pounds. 

 No. 3. 



Charge, 459 pounds. Smelting charge, 554 pounds. 



At Smelter C the above charges are smelting charges according to our definition, 

 but they are called semi-charges. The slags are not weighed, but measured by the 

 ore-shovel ; they are not mixed with the ore and tlux, but with the fuel. Fuel is meas- 

 ured by the fuel-shovel in the proportion of two shovels of charcoal for one of coke. 

 One shovel of charcoal (fuel-shovel) is equal to seven pounds, and one shovel of coke 

 (fuel-shovel) to 14 pounds. One shovel of slags (ore-shovel) weighs .about 15 pounds. 



In smelting charges Nos. 1, 2, and 3, the average proportions are 



Flux to ore 



Fuel to ore .... 

 Fuel to charge 



45J 



31 



21* 



At Smelter C the smelting charges are model ones, like everything else connected 

 with this smelter. The slags obtained from the above smelting charges have the com- 

 position of singulo-silicates. They are very fluid at a relatively low temperature, and 

 carry less lead and silver than any others in the camp; and the average charge repre- 

 senting the work done during a whole year will show with what regularity work is 

 carried on at this smelter. 



