Steve Chingwaru's SUES lunch seminar 29 April

[Martin Klausen]

Dear all,

It gives me great pleasure to announce this week's SUES lunch seminar by Dr Steve Jason Chingwaru, who is a Postdoctoral Researcher at the WH Bryan Mining Geology Research Centre, in Australia, honoring his Matie roots during a home visit by giving us a seminar on the "Recovery of Pyrite and Gold from Historical Tailings Using Multi-Gravity Separation (MGS)". He even supplies a brief abstract, below, together with his pasted (and attached) poster advert. 

Steve's in-person presentation will as usual be held in our Geology Building's Room 1004, from 13:10 to 14:00 on Wednesday the 29th of April.

Since MS Teams appeared to be working during last week's seminar, I have greater hopes for this and following seminars. This time using the following MS Teams links and meeting details: https://teams.microsoft.com/meet/332002012920068?p=UsOjYzwLhURv5a0Hhh

Meeting ID: 332 002 012 920 068
Passcode: HU9Uh93F

Abstract: Declining global gold grades and increasing environmental liabilities have renewed interest in reprocessing legacy sulphide-rich tailings. This study evaluates the performance of multi-gravity separation (MGS) on historical gold tailings from the Thalanga site, North Queensland, Australia. Comprehensive characterisation using wet chemistry, cyanide leaching, MLA, and LA-ICP-MS indicates a fine-grained material (P80 45–300 µm) containing 0.01–3.17 g/t Au, with gold strongly refractory and largely associated with pyrite. Laboratory-scale MGS tests (30% pulp density, 3° drum tilt, 175 rpm, 4 Hz) achieved an average pyrite recovery of 74 wt.% (16–87%), while also concentrating fine native gold (electrum) particles down to ~5 µm. Ongoing fire assay and aqua regia analyses will further validate recovery performance. These results demonstrate the potential of MGS for recovering fine-grained sulphide-hosted and native gold from historical tailings, supporting more sustainable mine waste reprocessing, sulphuric acid co-production, and circular economy strategies in the gold sector.

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Kind regards,

Martin Klausen