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

Pyrrhotite Recovery %
Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
100.0
95.0
90.0
85.0
80.0
75.0
70.0
Master Comp Grade vs. Recovery
0.0 20.0 40.0 60.0 80.0 100.0
Pyrrhotite Grade %
SGS Minerals Services
+75 um
-75/+25 um
-25 um
Sample
Figure 11: Mineralogically Limiting Pyrrhotite Grade -Recovery Curves
Care should be taken in the interpretation of these grade-recovery curves. They are better indicators of
how the liberation changes with particle size than they are predictors of actual flotation grade-recovery
potential. The mineralogical limiting grade-recovery curves do not take into account that most sulphides
will float at the same time and that some of the floatable gangue is very difficult to depress, unless some
of the Cu and Ni is sacrificed as well.
The mineral release curves for chalcopyrite, pentlandite and pyrrhotite are presented in Figure 12. The
mineral release curve is used to predict the amount of liberated mineral of interest at varying size
distributions. This can be an indicator of optimum grind targets for metallurgical processes to achieve the
most liberation for the least amount of grind energy. The variation between value and gangue mineral
release curves may sometimes be used to enhance separation.
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