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1 <br />1 <br />1 <br />r: ,. <br />'\ <br />.f. <br />1 <br />_ ::. ..~ <br />Page to <br />TABLE 14 <br />OPERATING EXPENSES' <br />Item <br />H SO ~'t <br />-. CaO~~ <br />Electrlcai~'~ <br />- NaOH"' <br />Operator•'t <br />Cost oer Tone of Ore <br />S 0.09 <br />S 0.04 <br />5 0.02 <br />S O.ts <br />S 0.01 <br />5 0.31 <br />~'~ Based on 50.04/Ib for 93% H,SO.. <br />m Based on 50.04/Ib CaO. <br />~t Based on the current mine price of 50.04/kw-hr. <br />t`~ Based on 48% caustic sdullon at 50.18/Ib. <br />rs~ Based on 535,000 per year. <br />The second mine Is a 3,500 ton/day operation exhibiting a slurry flow of 1,100 gpm and a wad cyanide level <br />of about 600 mg/I. The estimated capital and operating costs were 52,000,000 and 50.73,(lone of ore <br />processed, respectively. A summary of the costs are present in Tables 15 and 16. Employlhg a cost of <br />50.70/Ib for NaCN and a 95% recovery, the recoverable value of cyanide was 52.83/ton of ore processed. <br />The net recovered value was 52.10/ton or 52,600,000/year. The corresponding costs for chemical treatment <br />were several ddlars per ton of ore processed. <br />TABLE 15 <br />ESTIMATED CAPITAL COST FOR CYANIDE RECOVERY <br />Item Totat Cost <br />Stripping Towers 5 75,000 <br />Absorber Towers 75,000 <br />Tower Internals <br />Demisters ~. 60,000 <br />Distributers 60,000 <br />Support Gratings 30,000 <br />Packing 100,000 <br />Reactors 35,000 <br />Mixers 50,000 <br />Fans 30,000 <br />H,SO~ Feed System + Storage 25,000 <br />LJme Feed System + Storage 100,000 <br />NaOH Feed System + Storage 15.000 <br />Subtotal Equipment Costs S 655,000 <br />Instaliatlon Factor x 3.0 <br />TOTAL CAPITAL COST 51,965,000 <br />