Gekko Systems has announced the successful handover of the Hera Processing Plant to Aurelia Metalsfollowing the successful completion of performance trials by Gekko.
An Aurelia Metals ASX announcement, dated 23rd September, 2014, reads: The performance trials included a continuous 240-hour operating run, processing 9600 tonnes of ore, including a continuous 12-hour run at 50 tonnes per hour; equipment performance tests; and grinding and environmental compliance tests.
Aurelia’s managing director, Rimas Kairaitis said they were delighted to accept the Hera process plant following successful construction, commissioning and performance trials, adding that plant acceptance and first gold sales represent further important milestones for the Hera Project and the Company.
One of the most significant projects undertaken and executed by Gekko, the plant was completed on time and on cost. Commencing work in May 2013, Gekko successfully designed, manufactured, installed and commissioned the 50 tonne-per-hour gold polymetallic processing plant. Prior to receiving the contract, Gekko undertook a comprehensive test work program for Aurelia Metals and received positive feedback on the low-energy, cost-effective flowsheet.
According to Gekko Systems’ co-founder and technical director, Sandy Gray, the plant has been running successfully for several weeks in a stable condition with more than 1000 tons of lead zinc concentrate produced along with several gold and silver bars. Gekko’s most significant project features plenty of new technology including Vertimill, Derrick screens, and Merrill Crowe.
Key components of the plant design include a three-stage crushing circuit and coarse grind to 250 micron consisting of a jaw and cone crusher, vertical shaft impactor (VSI) and a Metso Vertimill enclosed circuit with a Derrick screen; gravity gold recovery circuit; rougher flotation at 250 micron before regrind of rougher flotation concentrate to 38 micron; cleaner flotation; cyanide leach of cleaner concentrate to leach gold and silver; zinc precipitation process to produce Au-Ag doré; leach residue filtration and stockpiling of Pb-Zn concentrate; and a peroxide cyanide destruction circuit.