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

% Liberated in fraction
Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
Pyrrhotite
Pentlandite
Chalcopyrite
Master Comp
1.0 10.0 100.0 1000.0
Particle Size (µm)
Figure 12: Mineral Release Curves
In the master composite, a significant increase in chalcopyrite liberation occurs between 75 and 10 µm.
Both pyrrhotite and pentlandite show a more gradual increase between these two sizes. The mineral
release curves indicate that the Cu circuit will require a regrind to 20 µm in order to liberate 80% of the
chalcopyrite.
In order to liberate the sulphide nickel, regrind sizes will need to target sizes of 30 µm or finer.
Pyrrhotite liberated at a coarser size than the value minerals. However, reagent schemes aimed at
gangue depression are more likely to target talc, chlorites, and serpentine as potential diluents.
2.2.6. Conclusions
The QEMSCAN mineralogical study of the master composite sample identified the following sample
characteristics:
• Copper and nickel are the major value metals in this ore and occur almost exclusively as chalcopyrite,
and pentlandite, respectively. The non-sulphide minerals are mainly chlorites, amphiboles, pyroxene,
talc, and feldspar.
• There are a high proportion of chlorites/serpentine, pyroxene and talc in the ore which may require
depressants to avoid recovery in the concentrate.
SGS Minerals Services
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