OMC’s scope of work was to assess, supervise and optimise comminution testwork (scrubbing in particular) for various ore blends. Based on the testwork results, a suitable comminution circuit was then sized.
The circuit consisted of an open circuit gyratory crusher (50/65 Metso), open circuit secondary crushers (2 x S6000 Sandvik) and closed circuit tertiary crushers (3 x H4000 and 3 x C660 Sandvik).
High throughput had been possible over the years on soft ores but throughput was severely restricted when processing the more competent ore types.
Two crushing circuit surveys were taken on soft and competent ore respectively. Models for the Tarkwa crushing circuit were generated using both PlantDesigner® and JK SimMet.
Recommendations to optimize crusher CSS and screen apertures were provided based on the modelling along with suggestions to maintain the choke feed conditions on the crushers.