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Resolute records record roaster throughput

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Resolute Mining’s Syama sulphide processing circuit has been progressively upgraded by the company, with particular attention being paid to the roaster. Image credit: Resolute Mining https://www.rml.com.au/

Resolute records record roaster throughput

Resolute Mining’s improvement in gold production from its Syama Sulphide circuit in Mali during the first half of 2022 were driven by record levels of roaster throughput and increased mill availability following the shutdown earlier this year.

The improved roaster throughput and increased mill availability resulted in a substantial increase in the recovery of gold in the circuit. Production from the Syama Sulphide circuit during the first half of the year was 73,225 ounces (oz) at an all-in-sustaining cost of USD1,414/oz.

According to Resolute’s CEO Terry Holohan, Resolute remains focused on further improvements to the company’s production profile. The Syama sulphide processing circuit has been progressively upgraded by Resolute, with particular attention being paid to the roaster. “We will continue to identify opportunities to enhance the sulphide plant throughput and recoveries further,” say Holohan.

Syama’s sulphide processing circuit comprises three-stage crushing, followed by ore grinding. The grinding circuit consists of three mills, one primary and two secondary.

Ground ore is then fed to the concentrator, which contains one skim air, two rougher, four scavengers and three cleaner cells to produce auto thermal concentrate for feed to the roaster.

The concentrate is thickened to around 70% solids to provide direct roaster feed. The roaster is an auto thermal circulating fluid bed roaster operating at ~720°C. The calcine product from the roaster is then processed through conventional Carbon in Leach (CIL), elution and electrowinning and smelting circuits to produce bullion.

“I am pleased with the ongoing continuous improvement of the Syama sulphide operation, which achieved 4% more gold produced on the comparable period including the planned major maintenance shutdown in the first half of 2022,” says Holohan.

Promising drill results in exploration programme

Holohan adds that Resolute’s exploration programme has recorded very promising drill results that have the potential to add significant sulphide resources below the historic oxide open pits at Syama North.

An updated mineral resource is expected to be announced in the September quarter, while drilling will continue throughout 2022. “We have also recently commenced a pre-feasibility study into low capital expansion options for the sulphide operations with the results expected in early 2023,” says Holohan.

The sulphide ore grade at Syama has also increased, reflecting improvement in cave management and flow modelling. Oxide ore mining continued at the Beta pit north of Syama and Tabakoroni Splay, and commenced at Tabakoroni North, with a 40% increase in ore mined.

Recent operations in May and June focused on preparation work for the second half of 2022 with significant pre-stripping activity and material movement ahead of the wet season.

Syama’s underground mine is a modern sub-level cave operation producing around 2.4Mtpa of ore. All underground production and development activity is owner operated. The company operates a fleet of development jumbos, production drills, loaders and trucks. A twin decline access and variable speed primary ventilation system provide capacity for future expansion of underground operations.

Resolute records record roaster throughput

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 Resolute records record roaster throughput

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