The Patio and Cazo Process. 61 



furnace; one reverberatory furnace for refining the silver; a 

 tank for the preparation of the magistral, with a three-horse 

 power boiler attached; two vats for dissolving the sulphate of 

 copper; a vat with hydraulic cement to make the salt solution, 

 with a boiler for boiling it; a syphon for clarifying the liquors, 

 which mnst all be treated with lime to precipitate the copper 

 contained in them ; — these constitute the machinery and appa- 

 ratus for the works. The cost of treating a ton of ore of about 

 $40, not including interest nor sinking fund, would be — 



Crushing, - - $1.60 



Mercury, magistral find salt. -'■-*.- 4.00 



Purifying the amalgam, - - - - .04 



Distillation, - - .04 



Fusion and firing, - - - - .09 



Various expenses - 1.00 to 1.10 



•16.87 



The whole operation is very simple. — quicker, and with less 

 loss, than the barrel, more certain in its reactions than thvpatio, 

 and applicable to almost all the ores found in Chili. It is even 

 cheaper, under some circumstances, than the lead fusion. 



