Recovery at Northmet Deposit - SGS

SGS MINERALS SERVICES TECHNICAL BULLETIN 2006-06
Figure 5 NorthMet Process Flowsheet: Hydrometallurgical Treatment of Bulk Cu-Ni-Co-Zn-Au-PGM Concentrate with Production of Copper Cathode, Au/PGM
Precipitate, Zinc Hydroxide, Nickel Hydroxide and Cobalt Hydroxide.
Table 2 Selected Flotation Pilot Plant Test Results Obtained at SGS Lakefield in 2006
Test
No.
Comp Product Wt
%
Grade Distribution, %
Cu, % Ni, % S, % Co, % Au,
g/t
Pt, g/t Pd,
g/t
Cu Ni S Co Au Pt Pd
1 Startup Feed 100 0.35 0.1 0.79 0.01 0.05 0.05 0.26 100 100 100 100 100 100 100
Tail 96.8 0.036 0.035 0.13 0.007 0.008 0.006 0.044 9.9 32.4 16.2 66 16 11.2 16.7
Conc 3.17 10.1 2.2 20.8 0.11 1.28 1.46 6.71 90.1 67.6 83.8 34 84 88.8 83.3
2 Startup Feed 100 0.38 0.11 0.85 0.008 0.05 0.05 0.25 100 100 100 100 100 100 100
Tail 96.2 0.032 0.03 0.12 0.005 0.009 0.009 0.043 8.1 27 14.1 57.2 16.3 16.3 3.4
Conc 3.8 9.22 2.04 19.3 0.095 1.17 1.17 6.47 91.9 73 85.9 42.8 83.7 83.7 85.6
3 C4 Feed 100 0.34 0.1 0.87 0.008 0.04 0.06 0.29 100 100 100 100 100 100 100
Tail 96.4 0.034 0.03 0.12 0.005 0.014 0.008 0.053 9.6 28.7 13.6 58.6 31.2 13.3 17.7
Conc 3.58 8.57 1.97 21.1 0.095 0.83 1.41 6.63 90.4 71.3 86.4 41.4 68.8 86.7 82.3
4 C4 Feed 100 0.34 0.01 0.93 0.008 0.04 0.07 0.29 100 100 100 100 100 100 100
Tail 95.8 0.037 0.029 0.11 0.005 0.006 0.005 0.051 10.5 28.7 11 62.7 13.6 6.7 16.8
Conc 4.2 7.16 1.66 19.8 0.068 0.87 1.59 5.76 89.5 71.3 89 37.3 86.4 93.3 83.2
5 C4 Feed 100 0.33 0.1 0.85 0.009 0.04 0.06 0.28 100 100 100 100 100 100 100
Tail 96.3 0.032 0.028 0.1 0.006 0.01 0.008 0.044 9.3 27.3 11.5 63.7 25.8 13.7 15.3
Conc 3.74 8.05 1.91 20 0.088 0.74 1.3 6.25 90.7 72.7 88.5 36.3 74.2 86.3 84.7
6 C4 Feed 100 0.32 0.1 0.86 0.01 0.03 0.06 0.26 100 100 100 100 100 100 100
Tail 96.6 0.039 0.034 0.13 0.007 0.013 0.018 0.052 11.6 33.1 15.1 70.2 36.2 27.6 19.4
Conc 3.41 8.4 1.97 21.5 0.084 0.65 1.34 6.12 88.4 66.9 84.9 29.8 63.8 72.4 80.6
6