mineral resource and mineral reserve statement ... - Impala Platinum

Marula Platinum Mineral Resourcesand Mineral Reserves continuedMarula (continued)Mineral Reserves as at 30 June 2010 as at 30 June 2009OrebodyCategoryMilltonnes(Mt)Grade(g/t)3PGE+AuGrade(g/t)5PGE+AuPt(Moz)Milltonnes(Mt)Grade(g/t)3PGE+AuGrade(g/t)5PGE+AuPt(Moz)UG2 Probable 45.2 4.10 4.76 2.6 36.3 4.48 5.31 2.3Notes• The figures in the statement above reflect totalestimates for Marula as at June 2010, correspondingestimated attributable Mineral Resources and Reservesare summarised elsewhere in the report• Mineral Resources are quoted inclusive of MineralReserves• Mineral Reserves quoted reflect the grade delivered tothe mill rather than an in situ channel grade quoted inrespect of the Mineral Resources• The modifying factors used in the UG2 Mineral Reservecalculation are based on the mine plan which envisageshybrid and conventional breast mining operations• Estimated geological losses have been accounted forin the Mineral Resource calculations but not estimatedpillar losses• The UG2 Mineral Resource accounts for themain chromitite layer channel width only, withoutconsideration of dilution• Grade estimates were obtained by means of ordinarykriging of borehole intersections• The Merensky Mineral Resource was re-estimated asa consequence of the independent third party audit byAMEC, which assisted with the estimation. The newestimate is based on a consistent width of 100cm• Changes in the UG2 Mineral Resource estimates sincelast year essentially reflect the re-alignment to thegroup-wide classification standard• The UG2 Mineral Reserve has increased due to theaddition of areas at Forest Hill and Driekop and aneffective increase in extraction rates. This was off-set bythe exclusion of levels 9 and 10, which were previouslyincluded in the Mineral Reserve estimate. Studies areunder way to re-assess the life-of-mine options; it ispresently foreseen that levels 9 and 10 will not be minedfrom the Clapham conventional decline section• The apparent reduction in the UG2 Mineral Reservegrade is the result of the exclusion of higher grade areasand the inclusion of areas with lower grades• Mineral Resource and Mineral Reserve grades arereflected in both 3PGE+Au and 5PGE+Au formats• Rounding of numbers may result in minor computationaldiscrepancieswww.implats.co.za 30 Implats Mineral Resource and Mineral Reserve Statement 2010