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

Mass (% Chalcopyrite)
Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
100
90
80
70
60
50
40
30
20
10
0
Chalcopyrite Exposure - Master Comp
Combined +75 um -75/+25 um -25 um
Locked 1.1 6.1 1.8 0.2
0-30% Exposed 13.3 55.5 21.9 4.2
30-50% Exposed 5.5 16.3 8.1 3.0
50-80% Exposed 10.3 10.2 14.1 8.4
Exposed 69.8 11.8 54.0 84.3
Figure 4: Chalcopyrite Exposure
Chalcopyrite liberation in the sample is reasonably good at a grind size of ~80 µm. The pure, free, and
liberated chalcopyrite accounts for 72% of the mineral mass overall. In the coarsest size fraction, this
decreases to 13% of the Cu being liberated, with the expected increase in liberation in the finer fractions.
Visual representations of these particles grouped by liberation class are shown in Appendix G.
Most of the chalcopyrite exists as liberated minerals but there are associations with other sulphides and
complex gangue particles in all size fractions. A regrind will be necessary in order to fully liberate the
copper minerals. Minor amounts of chalcopyrite are associated with nickel sulphides.
Examining the exposure data, 70% of the chalcopyrite in the sample is totally exposed; the best exposure
is seen in the -25 microns fraction. Locked chalcopyrite is 6% in the +75 microns fraction dropping to less
than 1% in the -25 microns. Less than 1.1% of the overall chalcopyrite was locked.
SGS Minerals Services
9