Gold



Worley is a global leader in the gold industry. Ourtechnical and project management capabilities are demonstrated throughthe successful delivery of numerous gold
projects across the globe. We work across all phases of goldprocessing, from management of metallurgical testwork to detaileddesign, construction and commissioning, and
plant optimization and operation. Our process engineering team includesgold specialists as well as experts in various unit operations.
Our knowledge base extends to the following unit operations and gold treatment processes:
• Ore handling: conveying, stacking, hydraulic & mechanical reclamation
• Ore storage: stockpiles and silos
• Comminution
• Ore concentration
• Solid/liquid separation
• Pressure oxidation (POX)
• Proprietary oxidation processes
• Atmospheric leaching processes
• Carbon adsorption
• Carbon elution & regeneration
• Gold product recovery processes
• Gold product finishing
• Cyanide destruction processes
• Backfill preparation
• Paste thickening
• Plant utility reticulation systems
Worley is familar with treating of oxide and refractory gold ores requiring diverse techniques such as flotation, ultrafine grinding and oxidation, as wellas the reclamation of tailings dumps. Further operations for goldprocessing include:
Comminution
Worley experience extends to the design, construction andcommissioning of mineral processing plants of varying capacities.
These plants will typically include a comminution circuit comprisingmulti-stage crushing and milling circuits to produce the requiredproduct grind for mineral recovery.
Crushing
Crusher technologies range from gyratory, cone, jaw and HPGR. They havedesigned & completed crushing circuits for minerals processingplants of varied throughput capacities
Milling
Milling experience involves circuits employing Autogenous andSemi-Autogenous Grinding (AG/SAG), Run-of-Mine and Regrind ball millsfor a varied range of throughputs.
The design of the milling circuit is governed by the physicalproperties of the ore (grindability), the ore potential (recoveryresponse for a given grind) and the downstream
processing requirement for optimal liberation and gold recovery
Leaching
Leaching experience incorporates both at atmospheric and pressure.Recent atmospheric leaching experience was gained at Ruashi in the DRCand pressure leaching experience at Impala Platinum in South Africa.
Flotation
Floatation experience extends to the design, construction andcommissioning of many flotation circuits for the minerals processingindustry. These include flotation circuits for a wide range ofthroughput capacities for several ore types.
Liquid Solid Separation
Liquid solid separation follows most milling and precedes most leachingsteps as a method for increasing pulp density to reduce reagentconsumption and for water recovery.
Thickening
Broad range of experience with the design, construction andcommissioning of many thickener installations including thickenercircuits for high density ores (UG2), Platreef ore
containing talcs and altered silicates and in varied applications.