Drilling continues at the Cangrejos project, with the completion of the prefeasibility study expected in early 2023. (Photo: Lumina Gold)

After a competitive bidding process, Vancouver-based Lumina Gold selected Ausenco Engineering Canada Inc. to lead the Cangrejos prefeasibility study. Ausenco was responsible for the waste rock, tailings management and site infrastructure portions of the 2020 Preliminary Economic Assessment for the Cangrejos project, located in southwest Ecuador.

As part of the PFS work for the project, Lumina and Ausenco have agreed to complete trade-off and optimization studies in the process plant layout and siting with the aim of reducing the plant footprint. The company will also provide an overall review of metallurgical test work; gravity gold recovery circuit cost/benefit analysis and gravity gold treatment method; gold-copper extraction/recovery circuit optimization, including saprolite and sap-rock processing; molybdenum concentrate circuit cost/benefit analysis; HPGR processing cost/benefit analysis vs. SAG/ball mill circuit; process plant throughput optimization; and review of the 2020 PEA filter plant and dry stack tailings design and identify optimization opportunities.

The drilling program is continuing at Cangrejos with four rigs now working on site. To date, approximately 4,700 meters (m) have been drilled across nine completed holes and three holes that are in progress. Lumina continues to expect the completion of the PFS in early 2023.