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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Mineral modal analysis of the F12 1 st cleaner concentrate and tails, illustrating the mineral distributions,
unsized, are presented in Table 27. Modal analysis and pentlandite, pyrrhotite, chalcopyrite,
chlorite/serpentine, and talc associations as well as grain size results are presented in Appendix G.
Table 27: Bulk Modal Analysis of F12 1 st Cleaner Concentrate and Tails
Sample
F12R Clnl Conc Ro Tails
Mass Size Distribution (%)
100.0 100.0
Calculated ESD Particle Size
10.8 20
Sample Sample
Chalcopyrite 8.4 0.1
Pyrrhotite 8.5 4.8
Pentlandite 10.7 0.1
Other Sulphides 0.1 0.0
Feldspar 0.7 3.0
Orthopyroxene 2.2 9.3
Clinopyroxene 2.6 14.0
Amphibole 6.0 12.5
Mineral Mass (%) Mica 0.2 2.5
Chlorite/Serpentine 32.0 46.9
Talc 25.7 2.1
Other Silicates 0.2 0.3
Fe Oxides 2.2 2.4
Other Oxides 0.3 1.2
Carbonates 0.1 0.5
Others 0.1 0.3
Total 100 100
The QEMSCAN results supports split type of flowsheet in which primary roughing is to focus on recovery
of the reasonably liberated material, ~85% Cu and ~70% Ni. This does not require a high collector
addition or high pyrrhotite recovery. This will need a short re-grind and three aggressive cleaners to reject
gangue and have high recovery of sulphides. Cleaner collector will have to be added part way through the
cleaner stages to keep the pentlandite and associated pyrrhotite floating. The concentrate from this circuit
will/may go to Cu-Ni separation to produce a saleable copper concentrate. The copper separation tail
would be Ni concentrate.
There will be a scavenger circuit where the collector dosage would be high to get a good recovery of the
remaining valuable, Ni, PGE and some Cu. There would be more notable re-grind here to get some
liberation and finally, likely three stages of cleaning to reject gangue and pyrrhotite.
The other choice is a finer primary grind, but the ore is hard and the tonnage is high, so there would be no
economical justification for this.
LCT-1 Products
Six products from LCT-1, namely; copper cleaner 1 concentrate, copper rougher tail, bulk cleaner 1 tail,
Ni cleaner 3 concentrate, Ni cleaner 1 tail and Ni scavenger tail products were submitted for QEMSCAN
SGS Minerals Services
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