Gold Reserves & Resources
Notes:
Cockburn: Reserve estimate by Navigator, 2011, estimated from a pit optimisation at A$1,700/oz gold price with subsequent pit design, based on a multiple-indicator kriging (MIK) resource model created by Coffey Mining, 2011. A mining ore loss of 5% has been applied; Corboys: Reserve estimate by Intermine, 2010, based on an inverse distance squared (ID2) resource model and pit optimisation at A$1,300/oz gold price with subsequent pit design. Factors of 10% mining dilution and 90% mining recovery were applied; Challenger: Reserve estimate by Navigator, 2011, based on an ordinary kriging (OK) resource model and pit optimisation at A$1,250/oz gold price with subsequent pit design. Factors of 10% mining dilution and 95% mining recovery were applied; Central and Success: Mining at both deposits was completed during the year and no ore reserves remain at either area.
Notes:
* Resource estimate by Coffey, 2011, within a $2,000/oz optimised pit shell; ** Resource estimate by Navigator, 2010; *** Resource estimate by Navigator, 2011. (Note: Challenger Pit depleted by Navigator for mining to 30 June 2011); **** Resource estimate by Coffey, 2006, and reported, 2011, beneath a $2,000/oz optimised pit shell and depleted for the Calista underground workings.
Notes:
* Resource estimate by McDonald Speijers in 2009, with Merton's Reward depleted by McDonald Speijers in 2010; ** Resource estimate by Runge Limited in 2009, with Bruno Grade Control depleted by Runge in 2010; *** Resource estimate by Navigator in 2009; Notes: Assay top cuts for Mertondale and Raeside are variable but generally between 10-20g/t Au and are 15g/t Au at Cardinia with no top cuts at Black Chief and Gambier Lass. No allowance has been made for dilution or ore loss. All resources (except Black Chief and Gambier Lass) are constrained by pit shells optimised at A$2,000/oz.
Rare Earth Metals
* COG = cut-off grade; TREO = Total rare earth oxides including yttrium; LREO = Light REO (La-Nd); MREO = Middle REO (Sm-Dy); HREO = Heavy REO (Ho-Lu); MT = Million tonnes; kt = kilotonnes.