John Mill cost is shown as $14.50 (table 17-8 (p101)

If you cross refer to 17.3.29 page 94 they indicate mill operating costs are shown in section 15 Table 15-2 (page 64)

Because the costing is at 1200 tpd (+ 300 from Redstone) at 1500 tpd = $14.28 cost/ton

average Ni recovery predicted Ni recovery used in this feasibility study is 88% (on steam analyzer being installed (+1%) (p90)

from this I will assume your first figure is taken into account.

Therefore surethings figure would be 20 lbs x .7 (less 30%) = 14 lbs

89.21/14 = $6.37cost per lb