Laterite Leach Tests

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Thickening and Vacuum Filtration Evaluation of Westmoreland Uranium Leach Residue Slurry Laramide Resources ___________________________________________________________________________________ 4.7 Mud Rheology Mud rheology data was obtained on the Westmoreland Leach Residue slurry sample over a range of solids levels using a Brookfield YR-1 vane viscometer. The yield stress results are presented on Graph 4.7 are also summarised in the following Table 4.7. Table 4.7 – Westmoreland Leach Residue Slurry Yield Stress Results Underflow Solids % w/w May 2011 Yield Stress Pa Underflow Solids % w/w Yield Stress Pa 59 % 11 64 % 53 60 % 14 65 % 77 61 % 19 66 % 107 62 % 29 67 % 163 63 % 40 68 % 244 Graph 4.7 – Westmoreland Leach Residue Slurry Yield Stress Results CONFIDENTIAL Page 13
Thickening and Vacuum Filtration Evaluation of Westmoreland Uranium Leach Residue Slurry Laramide Resources ___________________________________________________________________________________ 5.0 DISCUSSION – THICKENING 5.1 Feed Dilution The optimum solids settling flux for the Westmoreland Leach Residue slurry was observed when the solids were diluted to 7.5% w/w. As the feed stream to the thickener is expected to have a typical feed solids concentration of 45.0% w/w, the thickener requires a feed dilution system. An EIMCO Open Channel E-DUC® Feed System is capable of diluting the feed stream to the desired level. The EIMCO E-DUC® Feed System uses clarified liquor from within the thickener to dilute the incoming feed stream resulting in improved thickener performance through uniform feed dilution and improved flocculation of the feed stream. It also provides a means of de-aeration which can beneficial for flotation streams to reduce froth formation. May 2011 Figure 5.1 – Open Channel EIMCO E-DUC® Feed Dilution System CONFIDENTIAL Page 14
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AUSTRALIAN NUCLEAR SCIENCE AND TECH
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Laterite Leach Tests

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