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13.3 SGS V ANCOUVER – J UNE 2012
A new test program was started at SGS in October 2011. The sample was delivered
to SGS by Prophecy Platinum. Tetra Tech did not supervise any of the test work
involved in the program. The results from the final report from SGS were used for
the predicted bulk concentrate grades and recoveries. The report is provided in
Appendix C.
13.3.1 LOCKED CYCLE TEST WORK
Several batch tests were completed to develop the parameters for the locked cycle
tests (LCTs). Table 13.8 summarizes the LCTs performed in the SGS study.
A calculated head feed grade of 0.45% nickel, 0.35% copper, 0.42 g/t platinum, and
0.46 g/t palladium was tested. Conventional flotation conditions were used to
produce a concentrate with emphasis on base metal recoveries from locked cycle
testing (LCT-1 to LCT-3).
While this preliminary phase focused on metal recovery from Wellgreen’s
mineralization of typical representative grade, an additional test (LCT-4) was
conducted using material with a higher calculated head feed grade of 0.83% nickel,
0.55% copper, 0.57 g/t platinum, 0.57 g/t palladium, and 0.08 g/t gold.
Table 13.8 SGS – LCT Concentrate Grades and Recoveries
Ni
(%)
Cu
(%)
Concentrate Grade Concentrate Recovery
Co
(%)
Pt
(g/t)
Pd
(g/t)
Au
(g/t)
Prophecy Platinum Corp. 13-9 1193460500-REP-R0001-02
Wellgreen Project Preliminary Economic Assessment,
Yukon, Canada
Ni
(%)
Cu
(%)
Co
(%)
Pt
(%)
Pd
(%)
Au
(%)
LCT-1 8.9 8.9 0.5 3.1 7.8 0.6 63.3 86.9 60.3 24.6 62.1 48.1
LCT-2 7.1 7.0 N/A 2.4 6.8 0.5 63.4 84.9 N/A 26.4 64.4 62.9
LCT-3 5.7 6.0 N/A 3.6 6.2 0.5 67.6 87.8 N/A 46.0 72.9 58.9
LCT-4 8.2 6.5 N/A 2.9 5.6 0.6 72.9 88.0 N/A 37.7 72.6 62.2
LCT-1 was an LCT which featured separate copper and nickel concentrates to try
and achieve the maximum recovery of each metal. This is preliminary work carried
out with respect to creating separate copper and nickel concentrates. More work
should be carried out in the future to determine the PGE recoveries for each
concentrate.
LCT-2 was a bulk concentrate LCT. LCT-3 was a repeat of LCT-1 but the
concentrates were not split out. LCT-4 was a split concentrate LCT run on a higher
nickel grade composite. LCT-3 was chosen as the most representative test and has
been used for the design and predicted concentrate grades and recoveries in this
study. There were no cobalt analyses for this test so the cobalt recovery was