SMELTING CHARGES. 



649 



TABLE V. Composition of ore-bed*. 



No. 1 is made at Smelter H of ore from the Amie, Hibernia, Homestake, and Morning Star mines. 

 Xo. 2 is made at Smelter H of ore from the Amie, Chrysolite, Evening Star, Morning Star, and Virginius mines. 

 No. 3 is made at Smelter II of ore from the Amie, Evening Star, Hibernia, Homestake, Little Giant, Morning Star, etc. 

 No. 4 is made at Smelter H of ore from the Amie, and Evening Star. 

 No. 5 Is made at Smelter H of ore from the Amie, Adelaide , and of flue-dust. 

 No. 6 Is made at Smelter H of ore from the Amie, Morning Star, etc. 



No. T is made at Smelter B of ore from the Catalpa, Evening Star, Henriett, Hibernia, Highland Chief, Morning 

 Star, and Silver Wave mines. 



A consideration of Table V shows 



1. That the ore beds vary a good deal in weight ; in Ihe examples given, from 117 to 189 tons. 



2. That the mixtures contain on an average about the same quantity of silica, iron, and lead. 



3. That on an average the relation of silver to lead by -weight is as 1 to 120.4, or one ounce of silver 

 to 8i pounds of lead. 



4. That the anionnt of moisture is pretty constant. 



SMELTING OHABGES. 



By smelting charges will be designated the combined weights of ore, fluxes, and 

 fuel thrown at the same time into the furnaces, and by charges, the weights of ore and 

 fluxes entering into the composition of the smelting charges. The word ore embraces 

 ore beds and unmixed ores, and the word fluxes, dolomite, hematite, and old slags. 

 The weights of smelting charges differ a good deal, according to the capacity of the 

 furnaces. The term fuel will always be used for the mixtures of coke and charcoal 

 used in Leadville. Although the amount of fuel used in smelting will always be giveii 

 in weight, it must be remembered that coke and charcoal are not weighed at all smelters, 

 but are as often measured by the shovel or the barrow ; the volume has been converted 

 into weight for comparison. 



SMELTKR A. 



The information obtained at this smelter is not very satisfactory. The smelting 

 charges are made up of 



Charge (ore and flux), 2(0 rounds. Smelting charge (ore, flns, and fuel). 235 ponnda. 



