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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Table 26: LCT-4 Test Results
LCT-4 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. 6.0 7.57 9.27 30.2 2.51 6.15 0.71 36.6 2.03 82.8 66.9 26.9 26.3 64.4 55.6
Ni 3rd Clnr Conc. 1.2 2.07 3.83 18.8 4.10 2.77 0.32 28.1 12.6 4.7 5.7 3.4 8.9 6.0 5.2
Ni 1st Clnr Tail 16.5 0.18 0.64 12.7 1.06 0.45 0.05 ─ ─ 5.3 12.7 31.3 30.8 13.1 9.9
Ni Scav Tail 68.0 0.05 0.15 3.06 0.22 0.08 0.03 ─ ─ 6.2 12.3 31.0 26.3 10.0 25.2
Magnetic Clnr Conc. 0.2 1.26 1.22 10.9 6.94 6.39 0.55 26.5 16.4 0.5 0.3 0.3 2.5 2.3 1.5
Magnetic Rghr Tail 8.0 0.03 0.22 5.96 0.37 0.30 0.03 ─ ─ 0.5 2.1 7.1 5.2 4.2 2.8
Combined Conc. 7.4 6.48 8.15 27.8 2.89 5.59 0.64 34.9 4.18 88.0 72.9 30.7 37.7 72.6 62.2
Head (calc.) 0.55 0.83 6.73 0.57 0.57 0.08 ─ ─
Based on the test LCT-4, a bulk 14.5% Cu+Ni concentrate grade was achieved; the Cu and Ni recoveries
were 88% and 73%, respectively. The combined Au, Pt, and Pd grade of this test was 9 g/t. The Pt, Pd
and Au recoveries were 38%, 73% and 62%, respectively. The Fe/MgO ratio and MgO content of the final
concentrate were within the accepted limits in this test.
6. Mineralogy of Flotation Products
In order to quantify the degree of liberation of Cu and Ni minerals and describe mineral textures and
associations, the bulk Cu/Ni 1 st cleaner concentrate and the final products of test LCT-1 were submitted
to the mineralogy department for QEMSCAN analysis.
The first study focused on the mineralogy of the first cleaning stage for test F12 to investigate the loss of
Ni in the cleaner tails. The second mineralogy study evaluated the closed circuit by assessing the LCT-1
products. The objective for these studies was to better understand and identify nickel losses to improve
overall nickel recovery and define a recovery limit for nickel.
The results of the QEMSCAN TM analyses for flotation products are presented in Appendix G.
F12 1 st Cleaner Concentrate and Tails
The results of the F12 1 st cleaner concentrate analysis show only ~25% of the gangue is “free” and 75%
is with notable association with other minerals, notably sulphides. Pentlandite is only 71% free and
pyrrhotite is 46% free. The QEMSCAN data suggests it is not possible to reject ~70% of the gangue
minerals without losses of the sulphides. This was confirmed by metallurgical tests. The analysis of
metallurgical results had assumed low upgrading of Ni was related to pyrrhotite, however QEMSCAN
data shows there is also issues with gangue middlings as well. As the flotation test results show, there is
no difference in Ni-pyrrhotite selectivity between roughing and cleaning. It is not possible to get good Ni
recovery without floating pyrrhotite. The concentrate can likely tolerate a maximum of 20% pyrrhotite
recovery to meet the quality objectives. Although there is not a great degree of liberation at 90 microns
primary grind, but the degree of liberation is high enough for a reasonable rougher recovery and there
would be needed to add a re-grind stage to the circuit. The rougher tails results provide an examination
into the main reason for losses in test F12. There were minimal losses to the 1 st cleaner tails.
SGS Minerals Services
50