652 



GEOLUGY AND MINING INDUSTRY OF LEADVILLE. 



.Smeltek C. 



Smdthif/ cltarges made in Jiigiist, 1880. 



No. 1. 



i\ 



Charge (ore and flux), 4G3 pounds. Snv Iting cbarso (ore, dux, and fuel), 563 pounds. 

 No. 2. 



Charge, 403 pounds. Smelting charge, 503 pounds. 

 No. 3. 



Ore, 333 pounds. 



Ore-bed f!o. 1 . 

 Ore-be d No. 2 . 

 Dunkin Mine ( 

 Rock Mine ore 



Flux. 127 pounds. 



Fuel, 95 pouud.s. 



Dolomite G4 Charcoal 50 



Hematite 3 Coke and screenings- 45 



Oldslag.s CO ' I 



Charge, 459 pounds. Smelting charge, 554 pounds. 



At Smelter the above charges are smelting charges accordiug 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 flux, 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 jjounds. One shovel of slags (ore-shovel) weighs about 15 i^ounds. 



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



Fins to ore 4,5J 



Fuel to ore 31 



Fuel to charge 21 J 



At Smelter 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 singulosilicates. 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. 



