The primary purpose of the test work was to demonstrate a viable flowsheet that would maximize recovery for multiple, high-value products containing copper, nickel and cobalt.
The leaching circuit recovered over 90% of nickel and cobalt from pyrrhotite and also captured the majority of copper rejected from the floatation circuit increasing overall copper recovery to over 90%.
Notably, the test work was completed on a relatively low-grade sample, containing 0.43% copper, 0.18% nickel and 0.06% cobalt.
Great Boulder’s managing director Stefan Murphy said: “These results show that high-quality concentrates can be produced at high recoveries from sulphide mineralisation at Mt Venn
“Our preference to pursue a combined nickel-cobalt sulphide concentrate has demonstrated an exceptional high value product can be produced, with scope to further improve concentrate grade through process optimisation.
“These results are based on early drilling from Mt Venn before the Eastern Mafic was discovered and we are confident that the higher nickel grades we are seeing at the Eastern Mafic and nearby Winchester deposits will further improve overall recoveries.”
READ: Great Boulder Resources commences diamond drilling at Eastern Mafic targeting deep feeder zone
The Yamarna project hosts the Mt Venn deposit as well as the nearby emerging Eastern Mafic complex target.
Last month, Great Boulder commenced drilling four deep diamond holes at the Eastern Mafic complex with results pending.