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Gold Road Resources' Gruyere gold mine in Western Australia has produced a record amount of ore during the December quarter of 2021.
The Tier 1 gold operation mined 3.2 million tonnes (Mt) of ore, an increase of 0.6 Mt from the previous quarter, according to the company's December quarterly report.
The quarterly throughput was also at record highs at an annualised rate of 8.9 Mt per annum as the process plant utilisation lifted significantly during the quarter.
Gruyere produced 67,813 ounces of gold at an all-in sustaining cost (AISC) of $1526 per attributable ounce during the December 2021 quarter, compared to the September quarter which saw 59,371 ounces at an AISC of $1697.
The quarter-on-quarter improvement was largely the result of increased plant availability supporting record quarterly processing throughput and improving head grades.
Despite the improvement, quarterly production was down slightly on expectations due to delays accessing higher-grade portions of the stage two open pit, partly attributable to labour force delays and wet weather at Gruyere during December.
Mined grades lifted to an average grade of 1.00 grams per tonne (g/t). However, it was lower than expected for the quarter, also due to the delayed progress in advancing to the higher-grade parts of the stage two pit.
The mined grade is expected to lift through 2022 as mining advances through the deeper sections of the stage two pit, along with the mining of higher-grade oxide and fresh ore from the stage three pit.
Annual production guidance for 2022 is increasing to 300,000 - 340,000 ounces (150,000 - 170,000 ounces attributable) at an attributable AISC of between A$1,270 - A$1,470 per ounce.
