- Tonnes milled improved by 2% to 695 000 tonnes
- Nine months output increased by 7%
- Encountered power supply constraints
HARARE – Mimosa mine saw an increase in platinum group metals (PGMs) output for the third quarter ended 31 March 2021 (Q3 FY2021), despite power supply constraints experienced during the period due to utility infrastructure.
According to the quarterly report by parent company Impala Platinum Holdings (Implats) which holds a 50% stake in the mine, tonnes milled improved by 2% to 695 000 tonnes compared to 683 000 ounces recorded in the same period last year and milled head grade increased by 1% to 3.88g/t from 3.85g/t.
6E production in concentrate increased by 4% to 63 000 ounces compared to 61 000 ounces recorded in the third quarter of 2020.
In the nine-month period, milled volumes of 2.13 million tonnes increased by 7% and, while milled head grade of 3.88g/t was 1% higher, 6E volumes produced in concentrate increased by 8% to 196 000 ounces.
Production in the prior comparable period was impacted by extended repairs to the milling circuit in Q1 FY2020.
Mimosa is a shallow underground PGM and base metal mining and processing operation located on the Great Dyke of Zimbabwe, 32km west of the town of Zvishavane, approximately 340km southwest of Harare, the capital of Zimbabwe.
On a 50% attributable basis, Mimosa had, as at 31 December 2020, 1.5 million ounces of 4E PGM Mineral Reserves and 6.2 million ounces of 4E PGM Mineral Resources.
According to information provided by Sibanye Stillwater which jointly owns the mine with Implats on a 50/50 joint venture, at Mimosa, focus is being given to developing the Mtshingwe Shaft and further evaluating the Mtshingwe Block, extending the life of mine (currently 2032), stabilising production profiles at current performance levels and fast-tracking the conversion of Mineral Resources to Mineral Reserves.
Mining operations at Mimosa began in 1926 and two vertical shafts were sunk with trial mining starting in 1966 when 40,000t of platinum was processed. The operations were suspended in 1971 and Blore Shaft was established, from which 90,000t of ore was processed in 1975. The mining operations were further suspended in 1978.
Sibanye purchased 50% in the mine by acquiring Aquarius in 2016, with Impala Platinum owning the remaining 50% in the project.
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