Gekko Systems has installed full scale InLine Pressure Jigs (IPJ) continuous gravity recovery (CGR) circuits at both Kloof (Gold Fields) and Pirquitas (Silver Standard Resources). These installations have both shown a strong correlation between plant results and Gekko’s CGR laboratory test work protocol.
Gekko carried out the preliminary test work for both IPJ installations at its metallurgical laboratory, using Viking Cone and tabling test work when appropriate. Both of the CGR circuits have significantly different flow sheets and operating particle size ranges.
The results of the extensive gravity characterisation testing indicated that the ore contained at the Pirquitas mine site could be separated at a crush size of 12mm into 50% of the mass with less than 5% silver loss. The Gekko IPJ installation was based on these results.
The IPJs installed by Gekko at the Pirquitas mine treat particle sizes in the range of 2-12mm . Subsequent actual plant results correlates strongly with the initial test work, staying within the predicted variances. The plant has seen a higher grade produced by the IPJ circuit resulting in increased silver flotation recovery at a higher concentrate grade in the downstream milling and flotation circuit.
The IPJ circuit system at Piruitas was designed to deliver both optimum recovery and operating cost efficiency, as well as a low environmental footprint. Design features of the plant include:
- 214tph throughput
- 6 x IPJ model 2400s in two stages of three parallel trains
- de-rated IPJs down from a nominal 100tph to 75tph as suited to the required high mass pull to concentrate
- rougher scavenger jig circuit design to allow for high mass pull to concentrate
- a water recovery and recycle system to recover water from the IPJ heavies and lights before water is re-injected to feed the Jig circuit