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

Two RiversTwo Rivers is located approximately 35km to the southwestof Burgersfort on the eastern limb of the BushveldComplex. In broad terms, the geological succession issimilar to that of other areas of the eastern limb; both theMerensky Reef and underlying UG2 Reef occur at TwoRivers. The UG2 Reef outcrops in the Klein Dwarsriviervalley over a north-south strike length of 7.5km, dipping tothe west at between 7o and 10o. The extreme topographyresults in the UG2 occurring at a depth of 935m on thewestern boundary. The vertical separation between theMerensky and UG2 Reefs is around 140m.Three distinct reef facies (reef types) have been definedfor the UG2 Reef at Two Rivers, namely the ‘normalfacies’ with a thick main chromitite layer; a ‘split reef’in the southern, west-central and north-eastern parts,characterised by an internal pyroxenite/norite lens ofup to 6m thick and situated approximately two-thirds ofthe chromitite thickness upwards from the base; and a‘multiple split reef facies’ comprising a second pyroxenite/norite lens situated approximately one-third of thechromitite thickness from the base. The Merensky Reefis the upper portion of a pyroxenite layer, with a chromititestringer close to the contact with the hangingwall andmineralisation decreasing from the chromitite stringerinto the hangingwall and footwall. Only the UG2 Reef iscurrently being mined.Two Rivers holds a contiguous old-order mining right overa total of 2 139ha on a portion of the farm Dwarsrivier.Mine development targeting the UG2 Reef began in 2005and the mining layout is based on a mechanised bordand-pillardesign. The orebody is accessed via two declineshaft systems, situated approximately 2.5km apart. Theoperation is managed by ARM and Implats has a 45%interest in the joint venture.Two Rivers Merensky metal ratios% 5PGM+AuTwo Rivers UG2 metal ratios% 5PGM+AuPt 56.6%Pd 27.4%Rh 2.7%Ru 5.9%Ir 1.0%Au 6.4%Pt 46.5%Pd 27.2%Rh 8.7%Ru 13.5%Ir 3.3%Au 0.9%www.implats.co.za 34 Implats Mineral Resource and Mineral Reserve Statement 2010