GWR,
Thanks for the mill cost clarification. The $70 million I remember from years back might have been for the 5,000 tpd operation. Regarding the metal value of the suphide ores I come up with a value of $96.02 per tonne based on the MI&I as follows:
Gold - 2.06 g/t x 72% recovery x $1075/oz = $51.27/t
Silver - 114 g/t x 60% recovery x $15.41/oz = $33.89/t
Zinc - 0.58% x 44% recovery x $0.94/lb = $5.29/t
Lead - 0.41% x 67% recovery x $0.92/lb = $5.57/t
Total is $96.02/tonne. Of course these metal grades are the average for all ores with a metal value of $25/tonne bulk and $45/tonne narrow vein or more. We do have veins with metal content all the way from these minimums up to $1,000 per tonne or more such as the Terneras.