Wellgreen Project Preliminary Economic Assessment ... - OTCIQ.com

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Table 12: Cu/Ni Separation Test (Sep-F1) Results
Product Weight
Assays, (Pt, Pd, Au g/t), (Cu, Ni, S, fe, MgO %)
% Distribution
% Cu Ni Pt Pd Au S Fe MgO Cu Ni Pt Pd Au S Fe MgO
Cu Cleaner 1 Conc. 0.2 31.3 0.38 1.50 6.04 0.83 31.4 30.4 0.70 19.1 0.2 0.8 2.4 3.8 2.6 0.5 0.0
Cu Rghr Conc. 1.1 17.9 1.72 2.22 9.14 0.73 22.5 21.3 1.68 60.2 4.4 6.2 20.1 18.4 10.4 1.9 0.1
Cu Cleaner 1 Tails (Ni Conc.) 0.9 14.9 2.01 2.38 9.83 0.71 0.71 19.3 1.90 41.1 4.2 5.4 17.7 14.6 7.8 1.4 0.1
(Cu Rghr Tails (Ni Conc.) 2.0 2.51 9.75 4.52 9.47 0.33 22.3 31.9 5.70 16.2 47.4 24.0 39.7 15.9 19.8 5.3 0.5
Total Ni Conc. 2.9 6.23 7.43 3.88 9.58 0.44 21.8 28.1 4.56 57.3 51.6 29.4 57.4 30.5 27.6 6.7 0.6
Bulk 3rd Clnr Conc 3.1 7.79 6.99 3.73 9.36 0.47 22.4 28.3 4.32 76.4 51.8 30.2 59.8 34.3 30.2 7.2 0.6
Bulk 2nd Clnr Conc 5.0 5.06 5.19 3.29 6.67 0.36 18.1 26.6 9.20 81.9 63.4 43.9 70.3 43.8 40.4 11.2 2.0
Bulk 1st Clnr + Clnr Scav Conc 11.5 2.36 2.63 1.99 3.33 0.21 11.1 20.4 16.9 86.9 73.1 60.5 80.0 57.7 56.3 19.5 8.3
Bulk Rghr Conc 19.4 1.42 1.63 1.33 2.06 0.13 7.49 17.1 19.7 88.1 76.6 68.0 83.2 61.4 64.0 27.5 16.2
Bulk Rghr Tail 80.6 0.05 0.12 0.15 0.10 0.02 1.01 10.8 24.5 11.9 23.4 32.0 16.8 38.6 36.0 72.5 83.8
4.1.4. Split-Stream Flowsheet
A split-stream flow sheet was also tested and initial fast-floating copper minerals were cleaned separately
from slower floating nickel minerals. Test F18 was performed with the objective of producing a copper
concentrate that could be marketed to a smelter and a bulk copper-nickel concentrate to be processed in
a hydrometallurgy process. Since the first and second timed rougher concentrates were high grade in
copper, combined and was cleaned separately to produce a copper concentrate. The remainder of the
rougher concentrate (rougher concentrates 3-5) was cleaned separately in three stages. The results are
shown in Table 13. Detailed test results are presented in the Appendix E. It can be concluded that the
copper grade in the final Cu concentrate reached 28% Cu with a low recovery of about 27%. While the
grade of copper into the Cu concentrate was high, the nickel content in the copper concentrate was 0.5%.
With two cleaning stages a lower copper grade of 20% Cu concentrate with 65% recovery was achieved.
Nickel did not upgrade to any significant level in the bulk concentrate. In this concentrate, nickel grade
and recovery were 4% Ni and 7%, respectively. The other main portions of nickel were in the copper
cleaner tails and bulk rougher tails. Pyrrhotite deports mainly to the low-nickel grade concentrate.
Table 13: The Split-Stream Test (F18) Results
Product Weight
Assays, (Pt, Pd, Au g/t), (Cu, Ni, S, Fe, MgO %)
% Distribution
% Cu Ni Pt Pd Au S Fe MgO Cu Ni Pt Pd Au S Fe MgO
Bulk Clnr 3 Conc 0.8 1.34 4.02 7.10 2.68 0.33 19.7 29.2 2.74 2.9 6.8 13.5 4.7 5.2 5.1 1.7 0.1
Bulk Clnr 2 Conc 1.6 0.95 3.07 5.34 2.24 0.23 20.2 34.2 5.98 4.4 11.0 21.5 8.3 7.7 11.0 4.2 0.4
Bulk Clnr 1 + Clnr 1 Scav Conc 6.0 0.44 1.39 2.51 1.18 0.11 12.9 25.8 14.5 7.5 18.2 36.8 16.0 14.0 25.6 11.6 4.0
Bulk Rghr 3-5 Conc 12.2 0.26 0.80 1.45 0.70 0.07 8.46 19.9 18.6 8.9 21.3 43.4 19.3 16.5 34.3 18.3 10.3
Bulk Rghr Tail 78.4 0.04 0.11 0.14 0.07 0.02 1.51 12.0 22.7 8.0 18.9 27.0 12.5 32.3 39.5 70.8 81.2
Ro1-2 Cu Clnr 3 Conc.(High Cu Conc.) 0.3 28.4 0.46 1.82 13.2 1.72 29.5 28.4 2.79 26.9 0.3 1.5 10.0 11.8 3.3 0.7 0.0
Ro1-2 Cu Clnr 2 Conc. 1.1 19.7 1.32 2.31 11.4 1.51 22.5 25.1 7.27 64.5 3.3 6.5 29.7 35.9 8.6 2.2 0.4
Ro1-2 Cu Clnr 1 Conc. 3.0 8.94 3.61 1.87 7.40 0.70 14.3 19.3 14.2 76.5 23.8 13.8 50.7 43.2 14.3 4.4 2.0
Rghr 1-2 Conc 9.5 3.09 2.88 1.27 3.16 0.26 8.29 15.3 19.6 83.1 59.8 29.6 68.2 51.2 26.2 10.9 8.5
Rghr 1-5 Conc 21.6 1.50 1.71 1.37 1.78 0.15 8.38 17.9 19.0 92.0 81.1 73.0 87.5 67.7 60.5 29.2 18.8
4.1.5. Locked Cycle Testing
Based on the metallurgical performance and expectation from the mineralogical information, one locked
cycle test was conducted to provide more definitive performance information by re-circulation of middling
streams and the projection of concentrate grades and recoveries that would be realized from a
continuous process. The conditions for the locked cycle test were kept the same as the batch test F12.
Aero 3477 was added to the grind and guar gum and CMC were used in the cleaner stages. The 1 st
cleaner scavenger stage was dropped in this test since not enough gangue material is rejected to ever
SGS Minerals Services
38