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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Frequency .
300
275
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225
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175
150
125
100
75
50
25
0
0.05
0.15
0.25
0.35
0.45
0.55
0.65
0.75
0.85
0.95
Abrasion Index
1.05
SGS Minerals Services
1.15
Database
Wellgreen
Figure 14: Master Composite Abrasion Index Relative to SGS Database
4. Master Composite Flotation Testwork
Development of a flotation flowsheet was undertaken through a series of rougher kinetics and cleaner
flotation tests using 2 kg master composite test charges. The objective of these tests was to maximize
recovery of valuable minerals into saleable concentrates whilst also limiting the amount of MgO recovered
to the concentrates. The Ni and PGM values in the ore are deemed to be crucial for the profitability and
project economics. The complete results are located in Appendix D.
4.1. Preliminary Flotation Testwork
Preliminary flotation testwork was conducted on the master composite. The key variables tested were the
effect of grind, collector, talc pre-float and CMC on rougher kinetics. Open circuit cleaner testing was
conducted to test the effect of the regrind and dispersants/depressants on circuit recovery and bulk Cu/Ni
concentrate grade. A copper/nickel separation test and a split flotation test were also conducted in the
preliminary testwork. One locked cycle test was conducted to assess the effect of re-circulating products
on metallurgical performance.
In each test, pyrrhotite (Po), chalcopyrite (Cp), pentlandite (Pn) and non-sulphide gangue (NSG) grades
were calculated from stoichiometric relationship assumptions based on actual assays of copper, nickel,
and sulphur. It was assumed the major copper bearing mineral as chalcopyrite, nickel bearing mineral as
pentlandite and the remaining S content is associated with pyrrhotite.
Determining the non-sulphide nickel of tails was also undertaken for the selected tests.
1.25
1.35
>1.40
100
90
80
70
60
50
40
30
20
10
0
Cumulative Frequency (%)
19