Screen oversize is sent back to the SAG mill feed conveyor and screen undersize is
fed to Krebs hydrocyclones (12 units) for further size control. Hydrocyclone underflow
reports to the ball mill Koppers (Metso) 5.0m dia x 9.2m EGL.
The hydrocyclone overflow product is at a grind size of 70-80 % minus -0.053 mm.
A gravity gold recovery circuit is located within the grinding circuit. Slurry is pumped
from the hydrocyclone feed sump to the centrifugal gravity concentrator Knelson KCXD30,
which is equipped with a control unit to vary the operation mode and flush cycle.
The Knelson concentrate is further processed at a gravity table. As the concentrate
builds up, it is refined to concentrate bars.
The hydrocyclone’s overflow of solid content (35%) flows by gravity to the surge tank.
From the surge tank, slurry is pumped to deep-cone grinding thickener EIMCO
equipped with an agitator drive. Flocculent is added to get a clear overflow, and to
enable solids sedimentation. The thickener circuit overflow is pumped to a grinding