Laterite Leach Tests

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Thickening and Vacuum Filtration Evaluation of Westmoreland Uranium Leach Residue Slurry Laramide Resources ___________________________________________________________________________________ 1.2 Vacuum Filter Sizing The testwork indicated the design feed rate of 30 t/h of Westmoreland Leach Residue solids at 60% w/w solids can be filtered to a cake moisture of 23% w/w with a cake wash ratio of one to provide a residual concentration of both U and U3O8 in the filter cake of approximately 50ppm using a 2.5m wide 2.5M65 Eimco Horizontal Belt Filter that has a filtration area of 65 m 2 . The Table below summarises the expected performance of the Horizontal Belt Filter vacuum filter. Table 1.2 – Recommended Filter Sizing – Westmoreland Leach Residue May 2011 WESTMORELAND LEACH RESIDUE - FILTER SIZING Filter Type HBF Feed Solids % w/w 60 Solids Feed Rate t/h 30 Vacuum kPag -70 Cake Thickness mm 11 Cake Moisture % 23 Cake Wash Yes Cake Wash Ratio (kg/kg solids) 1.0 Filtration Rate kg/h/m 2 472 Filtration Area Required m 2 63.5 Selected Filter 2.5M65 Selected Model Filtration Area Available m 2 No. of Filters Required 1 65 CONFIDENTIAL Page 3
Thickening and Vacuum Filtration Evaluation of Westmoreland Uranium Leach Residue Slurry Laramide Resources ___________________________________________________________________________________ 2.0 INTRODUCTION FLSmidth was commissioned by ANSTO Minerals on behalf of Laramide Resources to conduct bench scale thickening and vacuum filtration testwork on one sample of Westmoreland Leach Residue slurry from their proposed Uranium Project in Queensland. The objective of the thickening testwork was to size a thickener capable thickening a design feed rate of 30 t/h of Westmoreland Leach Residue solids to maximum underflow density. The thickening testwork involved evaluating EIMCO High Rate Thickening technology in which the thickener typically operates with a mud bed depth of 1 – 2 metres. The objective of the filtration testwork was to size an Eimco HBF vacuum belt filter capable of dewatering a design feed rate of 30 t/h of Westmoreland Leach Residue solids to to optimum cake moisture content. The testwork was conducted by FLSmidth at the ANSTO Minerals facility at Lucas Heights, NSW. This report details the results of the bench scale testwork conducted on the sample of Westmoreland Leach Residue slurry, and discusses the size thickener and size of HBF filter required to process the nominated 30 t/h solids feed rate to maximum underflow density and optimum cake moisture content. May 2011 CONFIDENTIAL Page 4
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