Canada-listed Lumina Gold has released an improved flowsheet for the company’s Cangrejos project in Ecuador.
Lumina Gold (TSXV: LUM,OTCQX:LMGDF) has released an improved flowsheet for the company’s Cangrejos project in Ecuador.
As quoted from the press release:
Lumina Gold is pleased to announce that it has completed two trade off studies that will help form the basis of its updated
Preliminary Economic Assessment The first study evaluated the addition of secondary crushing and highpressure grinding rolls (“HPGR”) to replace the semi-autogenous grinding (“SAG”) mills that were contemplated in Lumina’s June 2018 Preliminary Economic Assessment (the “2018 PEA”). The second trade off study evaluated the addition of a Carbon -In-Leach (“CIL”) circuit to enhance recoveries and allow for the production of doré on site.
Both studies showed potential for enhancements to recoveries and operating cost reductions. Lumina intends to integrate the addition of a CIL circuit and HPGR into its updated PEA, which it expects to release in the second quarter of 2020.
Trade-off Study Highlights and Conclusions:
• The study demonstrated an approximately 30% savings in comminution circuit operating costs- Based on the trade-off study, the comminution operating costs for the HPGR circuit are estimated to be $3.75 per tonne processed compared to $5.62 per tonne processed for the SAG milling circuit that was used in the 2018 PEA(1)
• The operating cost savings are driven by reduced costs for steel and lower power consumption Metallurgical Recovery Flowsheet
• Adding the CIL circuit enhanced total gold recoveries, which offset additional capital and operating costs for the CIL circuit
• The circuit allows for the saprolite portion of the mineral resource to be extracted
• Production of doré will eliminate the need for a gravity concentrate to be shipped from the mine