re-operational question
If head grade is .35% and 80,000,000 pounds of copper are required then at 100% recovery and 100% availability then 10,370,754 tonnes of ore must be milled. .35/100 *2204= 7.714 pounds per tonne
10,370,754/365=28,413 tpd, every day of the year (7.714*28,413=219,177.88 pounds of copper) 219,177.88*365=79,999,926 pounds of copper
At 90% recovery and 100% availability 11,523,999 tpa gives 31,572.6 tpd (6.942*31572.6=219,176.98 pounds of copper)
At 85% recovery and 100% availability 12,202,255.1 tpa gives 33,431.647 tpd (6.556*33,431.647=219,177.87 pounds of copper
At 85% recovery and 90% availability 37,146.259 tpd for 328.5 days (90%) gives (6.556*37,146.259=243,530.87 pounds per day for 328.5 days =79999890. pounds of copper from 12,202,546 tpa
Run 1547 tph for 328.5 days and recover 85% of .35% Feed gives ~80,000,000 pounds of copper