MATERIALS USED IN SMELTING. 



689 



V. PROPORTIONAL RELATIONS. 



1. Parts of dolomite to 100 parts of ore. 



2. Parts of hematite to 100 parts of ore. 



3. Parts of fuel to 100 parts of ore. 



4. Parts of fuel to 100 parts of smelting charges. 



5. Bullion extracted to 100 parts of ore. 



6. Percentage of lead extracted in smelting. 



7. Percentage of silver extracted in smelting. 



8. Charges for smelting per ton of ore, in dollars. 



9. Cost of smelting per ton of ore, in dollars. 



10. Average assay of slag, in ounces of silver per ton. 



11. Average assay of flue-dust, in ounces of silver per ton. 



a These five averages were obtained by dividing by seven the sum of the respective proportions given for each 

 Smelter from which data were obtained. This gives a true average of the proportions for each smelter, but it might be 

 considered that a truer average for the camp would be obtained directly from the totals of ore, fluxes, and fuel consumed 

 during the year by these seven smelters. Calculated in this way, the average proportions are, respectively, dolomite to 

 ore, 12.50; hematite to ore, fi.51 ; fuel to ore, 31.99; fuel to charge, 23.31 ; bullion to ore, 19.94. 



VI. PLANT OF SMELTERS. 



