Great Boulder Resources (ASX:GBR) has conducted phase two metallurgical testwork, which demonstrates ‘excellent’ gold recoveries at lower cyanide concentrations at the Mulga Bill Project in Western Australia.
The total gold recoveries ranges from 92% to 96% with cyanide maintaining at 150 parts per million.
Great Boulder, which has a market capitalisation of $53.98 million, says these results show that reducing the cyanide concentration has negligible effect on gold recoveries.
Previous testing demonstrated recoveries are consistently high at grind sizes between 75μm and 150μm.
Managing Director Andrew Paterson says the initial work showed that Mulga Bill material leaches well and relatively quickly at a coarse grind size.
“Both sets of results are important, because low cyanide consumption and a coarse grind means lower processing costs, while fast leaching characteristics means we will need less leach tanks for the same throughput, which translates to reduced capital cost if we decide to build a stand-along plant,” Paterson says.
“Our Mulga Bill deposit has potential to produce a high-grade feed that would add value to any of the mills in the area.
“We are continuing to progress Mulga Bill towards engineering studies while we grow the Eaglehawk deposit, and we’re also continuing discovery drilling at Side Well South.”
Further, the Ironbark deposit’s Scoping Study is progressing. The company hopes to realise the results by the end of this month.
Great Boulder is a mineral explorer focused on its portfolio of gold and base metal projects in Western Australia.
Write to Aaliyah Rogan at Mining.com.au
Images: Great Boulder Resources
