|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Assessment of Gold and Sulphide Mineral Associations in a Pressure Oxidised Leached Residue
||Mark G. Aylmore, Martin Wells, Kelly Merigot, William Rickard, Zakaria Quadir, David Saxey, Brigitte Seaman
|On-Site Speaker (Planned)
||Mark G. Aylmore
Refractory sulphidic gold ores require some oxidation process to render gold locked in sulphide minerals available for subsequent cyanidation treatment to recovery the gold. It is well known that gold bearing pyrites can exist in various forms (blocky,fractured/porous,framboidal, disseminated pyrite) with varying As and Au tenor and crystallinity.
In this study the quantity of Au, chemical zonation and crystallinity of sulfide minerals and their elemental associations in both concentrate feed and cyanide leached oxidised residue was evaluated from Newcrest’s Lihir pressure oxidation circuit. This work is part of an investigation assessing whether Au bearing sulphides can be preferentially oxidised over gold barren sulphides and potentially reduce operating costs.
The properties of the different pyrites and elemental compositions were used to assess the reactivity of the different sulphides under oxidative leach conditions. The location and form of residual atomic Au distribution in a leach residue sulphide grain was examined.
||Planned: At-meeting proceedings