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

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Prophecy Platinum Corporation – <strong>Wellgreen</strong> Property – <strong>Project</strong> 50149-001<br />

impact on making concentrate grade. Test F34 used Aero 5100 and 3477 in the final stage of the Ni<br />

cleaner circuit.<br />

Test F35 used CMC and guar with a 50:50 mix. The results were encouraging and gave the best 1 st bulk<br />

cleaner performance. This test is notable for blended CMC/guar and higher SIPX in the bulk rougher.<br />

CMC is very good at depressing talc but also tends to collapse the froth when the dosage is high. Guar is<br />

often used to depress chlorite which was identified by mineralogy as the primary gangue mineral in the<br />

high grade concentrates. Guar also has the benefit of not collapsing the froth.<br />

Test F36 was a repeat of F35 but more aggressive for recovery with more time in bulk rougher and Ni<br />

scavenger as well as CuSo4 in Ni scavenger. No bulk reground was conducted in this test with only two<br />

stages of cleaning. Copper sulphate was added after Ni regrind in this test to keep the Ni and PGE<br />

floating. Test F37 was a repeat of F36 with no CMC/guar in the roughers. This had no effect on the mass<br />

recovery in rougher/scavenger. CMC/guar was eliminated in this test and yet had no effect on the mass<br />

recovery in rougher/scavenger.<br />

Test F36 was repeated as the test F38 with no CMC/guar in the rougher stages with a re-grind before 1 st<br />

Ni cleaner stage. And finally F41 was conducted at a finer primary grind of 70 microns.<br />

Overall, the results for these tests show there is no need for CMC/guar in the rougher. The results for bulk<br />

cleaners are good however more CMC/guar might be needed in the bulk cleaners. Ni scavenger results<br />

are good and use of copper sulphate is re<strong>com</strong>mended for master <strong>com</strong>posite. As for the Ni cleaner, it is<br />

needed to drop copper sulphate after regrind. Also SIPX additions need to stay high for recovery<br />

presumably to float the middling Cu/Ni material and for pyrrhotite recovery which has been shown to have<br />

abundant PGE minerals associated with it.<br />

SGS Minerals Services<br />

42

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