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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
independent primary and regrind target estimations which will allow adequate mineral liberation to
achieve target final concentrate grade.
Standard Bond grindability test (BWI) and abrasion index test were conducted. The BWI was determined
to be 19.7 kWh/t for the Wellgreen master composite ore. This is considered to be a hard ore in the
context of the SGS BWI database. The abrasion index fell in the soft range of abrasiveness with a Bond
abrasion index of 0.088.
A preliminary flotation testwork was conducted on the master composite. The key variables tested were
the effect of grind, collector, talc pre-float and CMC on rougher kinetics. Open circuit cleaner testing was
conducted to test the effect of the regrind and dispersants/depressants on circuit recovery and bulk Cu/Ni
concentrate grade. The preliminary cleaner flotation test results showed a 18% Cu+Ni concentrate grade
at the average Cu and Ni recoveries of 79% and 50%, respectively would be expected. At the same test
conditions the combined Pt, Pd and Au grade of 14 g/t at 22%, 53% and 53% recoveries, respectively is
achieved.
Following the preliminary testing, split flowsheet optimization testwork to optimize the flowsheet through a
more detailed program was started. The proposed split flowsheet recommends taking advantage of the
parallel cleaner lines. The viability of the flowsheet was confirmed by means of locked cycle testing
through re-circulation of middling streams. The average locked cycle test results over the last three cycles
showed that the master composite produced copper, nickel and final bulk concentrates projections as
shown in Table 3.
Table 3: Cu and Ni Metallurgical Predictions for Master Composite
LCT-3 Weight Assays, (Cu, Ni, S, Fe, MgO %) (Pt, Pd, Au g/t) % Distribution
Product % Cu Ni S Pt Pd Au Fe MgO Cu Ni S Pt Pd Au
Bulk Clnr 2 Conc. 2.78 11.0 9.28 27.2 3.39 10.3 0.80 31.6 4.13 83.5 57.6 25.9 22.7 62.9 50.3
Ni 3rd Clnr Conc. 2.36 0.59 1.78 12.8 3.55 1.45 0.11 22.4 17.9 3.8 9.4 10.3 20.2 7.5 6.1
Ni 1st Clnr Tail 15.7 0.10 0.34 4.41 0.66 0.41 0.03 ─ ─ 4.3 12.1 23.8 24.9 14.1 12.1
Ni Scav Tail 69.9 0.04 0.11 1.06 0.14 0.06 0.02 ─ ─ 7.6 16.6 25.4 24.1 9.5 25.4
Magnetic Clnr Conc. 0.21 0.85 1.22 8.93 6.19 5.41 0.52 24.4 18.4 0.5 0.6 0.7 3.2 2.5 2.5
Magnetic Rghr Tail 9.00 0.01 0.19 4.50 0.23 0.18 0.02 ─ ─ 0.2 3.7 13.8 4.9 3.5 3.6
Combined Concentrates 5.36 6.01 5.66 20.1 3.57 6.22 0.48 27.3 10.8 87.8 67.6 36.9 46.0 72.9 58.9
Head (calc.) 0.37 0.45 2.92 0.42 0.46 0.04
The results for High Ni Composite indicate the production of a combine concentrate with 14.5% Cu+Ni
grade at the average Cu and Ni recoveries of 88% and 73%, respectively. At the same test conditions the
combined Pt, Pd and Au grade of 9 g/t at 38%, 73% and 62% recoveries, respectively would be expected.
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