Larvotto study doubles throughput for NSW gold-antimony mine

Larvotto Resources says metallurgical engineering studies person shown it tin treble the process works throughput astatine its Hillgrove gold-antimony cognition successful NSW up to 500,000 tonnes per annum, with lone minimal upgrade and modification required.

The institution says its plant’s capableness to nutrient golden ore and doré successful conjunction with antimony ore tin easy beryllium accrued by expanding the crusher provender complaint from 220,000 tonnes per year. The survey was undertaken by Mincore, a starring process engineering and EPC (engineering, procurement and construction) contractor.

Larvotto Resources is utilizing a caller multi-gravity separator successful a bid to treble process works throughput and assistance golden and antimony recoveries.

Additionally, a complementary scoping survey of humanities golden and antimony accumulation reveals that a high-grade golden ore tin beryllium produced by incorporating a caller gravity separation module into the process stream. It would supply the imaginable to nutrient a high-grade golden ore of much than 150 grams per tonne gold.

‘The Hillgrove Gold and Antimony Mine is shaping up to beryllium an breathtaking accidental that provides a accelerated pathway to production.’

The imaginable betterment successful golden output contrasts sharply with humanities ore grades from anterior operations, which produced 50g/t gold. Management says the humanities results were obtained from provender grades of astir 1.5g/t gold.

Larvotto Resources managing manager Ron Heeks said: “As expected, the Hillgrove Gold and Antimony Mine is shaping up to beryllium an breathtaking accidental that provides Larvotto Resources with a accelerated pathway to production. Scoping level testwork undertaken connected humanities ore besides indicates the multi gravity separator is simply a imaginable crippled changer for the Hillgrove Gold Mine.”

Management said a abstracted survey conducted by AXT Automated Mineral Incubator Laboratory successful Perth besides enactment its imaginable for golden betterment improvement. AXT examined golden ore produced by erstwhile task proprietor Red River Resources portion treating low-grade ore stockpiles successful 2022.

The survey showed that adjacent with the archetypal Knelson concentrator – agelong regarded arsenic the eventual golden “catch-all” module to prime up gravity recoverable golden – successful beforehand of the flotation circuit, the archetypal Hillgrove concentrates inactive retained astir 13 per cent gravity-recoverable gold, typically bigger than 40 microns (0.04 mm) successful size.

However, it besides revealed that astir 44 per cent of the remaining good golden is smaller than 40 microns, portion the equilibrium comprises sulphide-hosted golden (40 per cent) and a tiny magnitude of non-sulphide oregon stibnite (antimony sulphide)-hosted gold.

The survey recovered that Red River’s debased golden betterment was owed to its mediocre archetypal provender grade, which is acold little than that expected to beryllium presented to the circuit by Larvotto.

It implies that improving gravity recovery, hence refining the golden interval provender concentrate, and expanding the flotation circuit would effect successful a important betterment successful wide recovery.

Testwork besides showed further betterment successful the gravity golden betterment circuit would beryllium imaginable utilizing a multi-gravity golden separator (MGS), which is simply a much caller and little analyzable innovation than the Knelson concentrator. Management says the MGS is susceptible of recovering much than 70 per cent of the golden from the concentrate.

Other projected upgrades and modifications with minimal flowsheet changes would entail the summation of a secondary crushing circuit, a tiny re-grind circuit and the proviso of an further good ore retention bin. Management says large components of the secondary crushing circuit and astir of the steelwork is already onsite.

The upshot of the survey is that important upgrades to works processing throughput, recoveries and wide show tin beryllium achieved with minimal further outgo to amended the winning of some antimony and golden from the ore. It would beryllium expected to importantly alteration accumulation costs, portion expanding golden and antimony production.

Following the affirmative findings, Larvotto is present eyeing much elaborate studies to refine the projected measures and costs to much accurately gauge the apt economical benefits.

Is your ASX-listed institution doing thing interesting? Contact: mattbirney@bullsnbears.com.au

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