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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
The following sections capture the bench-scale flotation testing component of the master composite in the
preliminary testwork.
4.1.1. Rougher Flotation Tests
A series of 12 rougher kinetics tests were conducted. Rougher kinetics tests can establish preliminary
grade and recovery relationships as well as flotation kinetics. This was accomplished by collecting
concentrates over incremental time periods. The effects of operational variables (primary grind, collector,
pH, talc pre-float and carboxy methyl cellulose (CMC)) on recovery were studied.
The initial test was conducted as a sighter test. Subsequent tests modified test conditions in attempts to
improve metallurgy. Further tests avoided too much collector to collapse the copper froth, but added
sufficient to recover the slower floating PGE minerals.
The final three rougher tests included additional collectors added at different points, dosages and a
selective collector versus SIPX. In test F-24 enough dosage of SIPX was added in the grind to get a good
copper recovery however the Ni recovery was low. Test F-26 replaced the SIPX in the grind with Cytec
Aero 4037 promoter to float copper more selectively than SIPX. Test F-27 was conducted with 20 g/t
SIPX in the first rougher instead of the grind to see if the pentlandite is more floatable at the start of the
rougher. Finally, test F-28 was conducted with 5 minutes aeration between grinding and the first rougher
to investigate if the pentlandite needs some aeration to get floating better. The results show aeration is
not required. Adding collector into the grind really only floats copper. Using a selective collector shows
more selective at floating copper from nickel and pyrrhotite however needs more investigation.
Table 7 summarizes the results of the rougher flotation testwork and Table 8 shows the rougher flotation
test results. Complete test details can be found in Appendix E.
Table 7: Summary of the Rougher Flotation Test Condition and Results
Grade, % Rec. % Grade %Rec. %Grade g/tRec. % Grade g/t Rec. % Grade g/t Rec. % Mass Rec.Prim. GrindFloat SIPX PAX pH CMC Option
Test Cu Ni Pt Pd
Au % Microns min g/t g/t g/t
F1 1.20 92.2 1.40 84.7 1.20 77.1 1.58 88.7 0.17 87.9 28.3 90 18 100 ─ Nat ─
F2 1.29 89.5 1.50 80.6 1.11 68.4 1.33 81.2 0.10 69.8 24.9 90 18 ─ 80 Nat ─
F3 1.82 92.8 2.03 78.8 1.65 66.8 2.04 81.7 0.15 62.8 18.0 90 20 70 ─ Nat ─
F4 1.63 93.1 1.82 82.4 1.58 78.7 1.93 89.2 0.16 67.5 20.4 90 20 70 ─ 9.5 ─
F5 1.54 95.7 1.74 81.9 1.49 70.3 1.79 82.3 0.10 59.2 22.2 50 20 70 ─ Nat ─
F6 1.49 90.6 1.68 81.3 1.36 73.4 1.60 85.0 0.11 61.8 22.1 144 20 70 ─ Nat ─
F7 1.37 82.2 1.68 79.3 1.37 67.6 1.64 73.7 0.11 57.5 21.5 90 20 70 ─ Nat ─ Talc Pre-float
F8 1.70 91.7 1.86 80.5 1.53 67.6 2.00 83.0 0.16 65.7 19.7 90 20 70 ─ Nat 60 CMC
F24 1.74 90.3 1.92 75.1 1.52 63.0 2.50 82.0 0.17 62.7 16.9 90 20 60 ─ Nat ─
F26 2.30 87.8 2.36 73.6 1.66 51.0 2.50 73.0 0.18 60.0 14.2 90 20 40 ─ Nat ─ 4037 20 g/t
F27 1.79 85.8 1.93 71.9 1.40 49.0 2.30 74.0 0.14 55.5 15.6 90 20 60 ─ Nat ─
F28 2.08 86.1 2.30 71.3 1.63 47.0 2.70 74.0 0.18 57.4 13.3 90 20 60 ─ Nat ─ Aeration
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