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

Re-grinding
Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Primary grinding
Bulk Clnr 1
Bulk Clnr 2
Bulk Rghr
Bulk Clnr 1 Tails
Re-grinding
Ni Clnr 1
Bulk Clnr 2 Tails
Bulk Clnr 3
Bulk Clnr 3 Tails
Cu Rougher
Ni Scav.
Cu Concentrate
Ni Clnr 2
Figure 26: Split Flowsheet
SGS Minerals Services
Ni Clnr 1 Tails
Ni Clnr 3
Ni Concentrate
Ni Scav. Tails
Ni Clnr 2 Tails
Cu Rghr Tail (Ni Concentrate)
Cu Cleaner
Cu Clnr Tails
Ni Clnr 3 Tails
Ten flotation tests were conducted to optimize the split-stream test conditions. Test F29 was intended to
scope appropriate bulk cleaner conditions for the bulk cleaner circuits (rougher and scavenger) as well as
attempted a preliminary Cu-Ni separation of the bulk cleaner concentrate. The objective of the bulk circuit
was to recover most of the copper and most of the liberated pentlandite. The Ni scavenger used a high
dosage of SIPX to get a high recovery of PGE. The bulk 2 nd cleaner concentrate contained in excess of
37% non-sulphide gangue (NSG), which was considered very high. A high content of NSG was present
in the scavenger cleaner as well and pyrrhotite was noted to have poor kinetics. Cu-Ni separation showed
promise with a Cu concentrate grade of 29% Cu and 0.4% Ni at a copper recovery of 40%.
Test F30 was conducted with no re-grind in the bulk circuit and coarser regrind for Ni circuit. CMC was
used in the rougher and scavenger stages. In Test F31 Ni scavenger time was extended and CuSo4 was
added in the third scavenger stage.
Test F32 used copper sulphate in the Ni scavenger and Aero 5100 was used in the copper circuit. This
test gave the best Ni cleaner performance and this is notable for the addition of CuSO4 with no apparent
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