Crushing Circuit
- 150 t/h throughput
- Crushing plant fed by front end loader from ROM stockpile
- Primary jaw crusher - Feed 700 mm max lump size
- Product 80 mm max lump size
- Jaw crusher product is conveyed to the sizing screen sizing at 25 mm
- Oversize from the screen is conveyed to the secondary crusher
- Secondary cone crusher
- Feed 80 mm max - Product 25 mm max
- Cone crusher product is conveyed to the sizing screen
- Crushing plant product, undersize from the sizing screen, is conveyed to the 1,500 ton capacity fine ore bin
Grinding & Gravity Gold Recovery
- 75 t/h throughput
- 9 to 12 g/t head grade
- Operating 24 hrs per day
- Gravity gold recovery 75%
High Pressure Grinding Roll (HPGR) x 1
- Ore moves from the fine ore bin to the HPGR and is crushed to minus 4mm to liberate coarse gold particles to maximize gravity recovery
- HPGR product is mixed with water and fed onto a 4mm aperture screen. Oversize is returned to the HPGR
- Screen feed box equipped with gold trap for any large nuggets
Gravity circuit
- The ore/water slurry from the screen undersize is pumped to in-line pressure jigs (x 3). Jigs use vertically pulsating water to separate the heavy particles from the lighter crushed rock. Heavy particles are collected to form a concentrate which flows from the jigs to the spinners for further concentration. The spinners further concentrate gold particles which are pumped to the gold room for further upgrading
- The jig tails are screened at 2mm and undersize fed to a Falcon Concentrator. The concentrate is pumped to the gold room for further upgrading
Ball Mill
- The ball mill grinds the ore finer to liberate remaining gold
- Ball mill product is returned to the start of the gravity circuit
Flotation (75 tph
- SOLD, no longer available
- We can supply economical replacements) Carbon in Leach (CIL)
- 3.4 tph
- The CIL circuit is a series of 7 agitated tanks
- The flotation concentrate is fed to the first tank with sodium cyanide and lime slurry. Oxygen is injected separately into each of the tanks.
- Activated carbon is also added to each tank. Gold concentration on the carbon will reach 1,500 g/t gold
- 0.5 ton per day of activated carbon is removed from the first CIL tank and taken to the elution plant where the gold is removed and electroplated onto steel wool
- The carbon is then re-activated and returned to the last tank in the CIL circuit. Carbon is sequentially moved up to the first tank
Cyanide Detoxification
- The CIL tailings stream flows to an agitated tank where the cyanide is destroyed
- Detoxified tailings stream is pumped to an HDPE lined storage facility. Water draining from the tailings is returned to the CIL circuit
Gold Room
- Gold production up to 200,000 ounces per annum
- Concentrate from the gravity plant is upgraded by a small gravity circuit using a jig, centrifugal spinner and concentrating tables and smelted in an LPG fired furnace with fluxing chemicals
- Tailings from the gold room gravity circuit are fed to an intensive cyanide leach reactor (ILR) where the gold is dissolved and then electroplated onto steel wool
- The gold electroplated onto steel wool from both the ILR and CIL is removed and also smelted in the furnace
General
- Total gold recovery 95 %
- Crushing areas have dust extraction and collection systems to remove dust from the atmosphere
- Gas emissions from the gold room and carbon reactivation kiln are passed through scrubbers
