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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Conclusions and Recommendations
A test program was completed on a master composite and a high Ni composite sample from the
Wellgreen property in Yukon Territory, Canada. SGS Vancouver Metallurgy received multiple shipments,
a total of 300 kg to prepare the master composite, and later on a third shipment of 120 kg to prepare the
high Ni composite. The material shipped was originally three sub-composites (massive sulphide, gabbro,
and peridotite) and was used to prepare a Master Composite and a High Ni Composite for metallurgical
testing.
A mineralogy investigation on feed sample was completed by QEMSCAN (quantitative mineralogy) on the
master composite to identify mineral liberations and associations and develop grade limiting/recovery
relationships for the sample. The results showed that the sulphide minerals dominated by chalcopyrite,
pentlandite, and pyrrhotite. Copper and nickel contents combined approximately 2% of the sample mass.
Chalcopyrite and pentlandite accounted for most of the Cu and Ni in the sample, respectively. The master
composite is non pyritic and contains high levels of chlorite/serpentine. It also contains pyroxene,
amphibole, mica and talc. Main copper sulphide (chalcopyrite) mineral association for the overall sample
exist with complex gangue minerals (16.5%), pentlandrite (0.7%), and pyrrhotite (3.6%). Nickel sulphide
association for the overall sample shows complex gangue minerals (6.6%), chalcopyrite (1.5%) and
pyrrhotite (5%). Pyrhotite association for the overall sample shows complex gangue minerals (4.8%),
chalcopyrite (0.9%) and pentlandite (0.7%). Overall, the liberations of chalcopyrite, pentlandite, and
pyrrhotite were adequate to produce good metallurgical performance in a bulk rougher circuit. Regrinding
of rougher concentrates is recommended to improve liberation of chalcopyrite and pentlandite in order to
produce optimum cleaner circuit performance.
Standard Bond grindability test (BWI) for ball mill grinding and abrasion index test were conducted. The
BWI was determined to be 19.7 kWh/t for the Wellgreen master composite ore. This is considered to be a
hard ore in the context of the SGS BWI database. The abrasion index fell in the soft range of
abrasiveness with a Bond abrasion index of 0.088.
A 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. Due to the lack of any positive
effect of talc pre-float and CMC addition, the base case (70 g/t SIPX) was shown to be the preferred one.
A primary grind size of 90 microns was identified as optimum.
Further cleaner flotation tests were followed based on the rougher flotation conditions of the base case.
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. Overall, the preliminary cleaner flotation test results
showed a 18% Cu+Ni concentrate grade at the average Cu and Ni recoveries of 79% and 50%,
respectively would be expected. At the same test conditions the combined Pt, Pd and Au grade of 14 g/t
at 22%, 53% and 53% recoveries respectively, is achieved.
SGS Minerals Services
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