TREATMENT OF THE COMSTOCK OEES. 269 



that the actual costs are probably considerably greater than they would be if 

 the mill were constantly working up to its full capacity. In effect, the naill 

 purchases the ore of the mine for eighty per cent, of its value, less ^40 or $45 

 per ton, the stipulated price for working, making its return in cash or bullion 

 without any statement of the yield actually obtained. 



The following is a statement concerning the first-class ore produced by 

 the Savage mine during the year ending July 1, 1868, and treated at this 

 mill: 



Tons. 



Quantity of ore delivered from the mine 277^^^ 



Less moisture, amounting to 6^^ per cent., leaving 258^°^ 



Assay value of the ore, per ton — gold $123 66 



Assay value of the ore, per ton— silver 325 74 



$449 40 



Proportion of gold in the ore, per cent 27j^ 



Proportion of silver in the ore, per cent 72 j^ 



Total assay value— gold $34, 317 08 



Total assay value — silver 90, 402 43 



$124, 719 61 



Eeturu of bullion, equal to 80 per cent 99, 775 59 



Or per ton 359 52 



Price paid for working, per ton 41 87 



Similar statement for year ending July 1, 1869. 



Tons. 



Quantity of ore delivered from the mine 68^^ 



Less moisture, amounting to 5^^^ per cent ^^-i^^o 



Assay value of the ore, per ton — gold $73 69 



Assay value of the ore, per ton — silver 201 78 



$275 47 



Proportion in the ore of gold, per cent 26. 7 



Proportion in the ore of silver, per cent. 73. 3 



Total assay value of the ore— gold $5, 026 36 



Total assay value of the ore — silver 13, 763 72 



$18, 790 08 



Eeturn of bullion, equal to 80 per cent 15, 028 33 



Or per ton 220 32 



Price paid for working, per ton ■ 43 12 



