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

Prophecy Platinum Corporation – Wellgreen Property – Project 50149-001
Au recoveries were 26%, 64% and 33%, respectively. The Fe/MgO ratio and MgO content of the final
concentrate were above the accepted limits in this test.
4.2. Optimization Flotation Testwork
4.2.1. Split-Stream Flowsheet
Following the preliminary testing, the next step of the flotation testwork to optimize the split flowsheet
through a more detailed program was started. The proposed split flowsheet recommends taking
advantage of the parallel cleaner lines presently used by most Cu/Ni commercial operations. The strategy
would be to direct a rougher concentrate, rich in copper and nickel minerals to one of the lines and to
direct a scavenger concentrate, rich in pyrrhotite to the other line. The advantages of decoupling the
cleaners would be that the collector and CMC conditions could be customized to the floatability of each
mineral class. Specifically, the copper and nickel minerals are known to be responsive to very low
collector conditions. This low amount of collector is anticipated to result in significant improvements to the
flotation separation of copper from nickel. Also the rougher circuit can be focused on recovery of the
liberated minerals and avoid regrind here. The pyrrhotite rich products would likely have most of the
middling particles and this is where r regrind is applied. On the other hand, the pyrrhotite is known to
require high amounts of collector to recover acceptable levels of sulphides. It is predicted that the
proposed flowsheet will result in the production of better quality copper concentrates and better process
control in the commercial operation.
The proposed flowsheet is presented in Figure 26 and the tests results are presented in Tables 15 and
16. As the testwork progressed modifications to the flowsheet were applied for each individual test as
presented in the Appendix E.
SGS Minerals Services
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