SMELTING CHARGES AT INDIVIDUAL SMELTEES. 



653 



The average charge, deduced from data given in Table IV, is as follows: 



Ore, 310 poumls. 



Flux, 157.6 pouuds. 



Fuel, 105.9 pounds. 



Oies 310 Dolomite 69.53 Charcoal 59.10 



Hematite 29.57 Coke 46.80 



Old slags 58.50 I 



Charge (ore and flux), 467.6 pounds. Smelting charge (ore, flux, and fuel), 573.5 pounds. 



In the average charge the proportions are 



Flux to ore 50f 



Fuel to ore 34^ 



Fuel to charge 22? 



Being iu possession of data obtained at Smelter C for the mouth of July, 1880, 

 these data will be discussed, for iu the opinion of the writer everything connected 

 with Smelter C is worth recording. 



Tons. 



Ore smelted in July, 1880 1,500 



Dolomite smelted in July, 18t;0 525 



Hematite smelted in July, 1860 85 



Bullion produced in July, 1?80 435$ 



The bullion produced iu twenty-four hours is equal to 14 tons, assaying 130 ounces 

 of silver to the ton. 



The average charge for the month of July, 1880, is as follows: 



i F i 



Ore, 310 pounds. Flux, 144 pouuds. Fuel, 105 pouuds. 



Ores 310 Dolomite 67 Fuel 105 



Hematite 17 



Oldslags ... 60 



Cliiirp- (ore ncd flux). 454 pouuds. Smelting charge (ore, flnx, and fuel), 559 pounds. 



In the preceding charge the average proportions are 



Flux to ore 4&J 



Fuel to ore 34 



Fuel to charge 23 



Production of bullion per charge, 90 pounds. 



As has previously been stated, the mixture of ore, dolomite, and hematite, weigh- 

 ing about eight hundred pounds, is called the charge. It is made to contain about 

 20 per cent, of lead, of which about 88 per cent, is extracted in the state of bullion. 

 Consequently each charge will contain 160 to 1G1 pounds of lead, of which 141 to 141.5 

 pounds are extracted in the state of bullion. This quantity of bullion requires 200 

 pounds of fuel for its extraction, showing that one part of bullion requires about one 

 and one-half parts of fuel for its reduction. 



As the quantity of material to be smelted in each charge weijihs about 920 pounds, 

 from which 141 pounds are extracted in the state of bullion, the remaining 779 pounds 



