Planned maintenance sharply reduced final metal output in the September quarter, but rising concentrate inventories, the Mupani expansion and investments in processing and energy infrastructure reveal a company repositioning its production base for the next phase of growth.

• Zimplats accumulated 43,000 ounces of concentrate awaiting processing after its planned furnace shutdown.
• Final 6E metal output fell 35% quarter-on-quarter, while concentrate production declined 5%.
• Mupani, smelter expansion and solar investments are reshaping the group's production infrastructure.

Harare - Zimplats ended the September quarter with 43,000 ounces of 6E concentrate inventory, approximately 20,000 ounces more than at the beginning of the period, as a planned furnace shutdown disrupted the conversion of mined and concentrated ore into final metal. The accumulation exposes an important feature of the group's current operating cycle: its ability to produce concentrate is advancing more steadily than the volume of finished metal leaving its processing facilities, placing the reliability and timing of the smelting operation at the centre of its FY2027 production outlook.

The company's September 2026 quarterly report shows that 6E metal in concentrate declined 5% quarter-on-quarter to 164,129 ounces, while final-product production fell 35% to 138,844 ounces. The difference reflects the planned 60-day furnace ring maintenance programme that commenced on 1 September, with operations scheduled to resume by the end of October. Concentrate produced during the shutdown was stockpiled for subsequent processing, with the accumulated inventory expected to be smelted during the remainder of FY2027.

The distinction matters when assessing the underlying production performance. A 35% quarterly decline in final metal output would ordinarily raise concerns about operational deterioration, but the concentrate figures indicate a different picture. Year-on-year, metal in concentrate increased 3%, supported by higher milled tonnage and improved recoveries, while final-product output declined only 3%. The quarterly production disruption is therefore substantially associated with the planned processing interruption rather than an equivalent collapse in mine and concentrator performance.

The company's mining operations are nevertheless undergoing a transition. Ore mined declined 5% quarter-on-quarter to 2.004 million tonnes following the closure of South Pit operations, and was 1% below the corresponding period last year. The 6E head grade remained stable at 3.30 grams per tonne, suggesting that ore quality has been maintained despite the change in the mining footprint.

Milled volumes declined 4% quarter-on-quarter to 2.016 million tonnes, partly reflecting a planned mill reline shutdown at the Selous Metallurgical Complex concentrator. On a year-on-year basis, throughput increased 2%, supported by improved ore availability. Concentrator recovery declined from 78.0% to 76.8% compared with the previous quarter, reflecting the treatment of partially oxidised residual ore from open-pit operations. However, recovery improved from 75.6% a year earlier, indicating better performance over the longer comparison period.

These operating movements place greater importance on the timing of Zimplats' capital projects. The Mupani Mine development and upgrade remains on course to reach full production capacity of 3.6 million tonnes annually by FY2029. Cumulative expenditure reached US$368 million against an approved budget of US$386 million at September, leaving the project substantially advanced financially. Its contribution will be important in replacing mining capacity affected by the closure of older operations and sustaining the group's future ore supply.

The transition also extends into the processing infrastructure. Zimplats' smelter expansion and sulphur dioxide abatement project had accumulated expenditure of US$480 million against an approved US$544 million budget. The investment is intended to strengthen local processing capacity while improving the management of emissions from smelting operations. Its completion is strategically important because the value captured from the group's mineral production depends not only on mining volumes but also on the capacity and reliability of downstream processing facilities.

Energy infrastructure is another part of this operating equation. The 45MW Phase 2A solar project had reached US$45 million in cumulative expenditure against an approved US$54 million budget. Commissioning commenced shortly after the quarter ended, with the project expected to increase Zimplats' solar generation capacity to 80MW during the second quarter of FY2027. The investment strengthens the group's ability to meet part of its electricity requirements through dedicated generation, reducing exposure to interruptions and the cost implications of external power supply.

The financial performance reflects the interaction between production timing and operating costs. Total operating cash costs were US$173.7 million, 16% below the June quarter, largely because of reduced power consumption during furnace maintenance and lower engineering maintenance expenditure. Operating cash cost per 6E ounce declined 1% quarter-on-quarter to US$1,119, but remained 5% higher than the US$1,068 recorded in September 2025. Total operating costs also increased 7% year-on-year, partly reflecting higher US dollar-equivalent costs for South African rand-denominated consumables following the strengthening of the rand against the US dollar.

This cost movement deserves attention as Zimplats increases investment in its mining and processing infrastructure. Capital expenditure can improve future production capacity and operating resilience, but the commercial benefit depends on the additional volumes and efficiencies generated relative to the capital committed. The Mupani development, smelter expansion and solar investment must ultimately translate into reliable throughput, lower unit costs and improved utilisation of the group's installed assets.

The immediate production recovery depends on the furnace returning to operation as scheduled and the accumulated concentrate being processed without further disruption. The 43,000-ounce inventory provides a substantial volume of material available for conversion, but its existence should not be confused with completed metal production. The rate at which it is smelted will influence reported final-product volumes during the remaining quarters, alongside mining availability, concentrator performance and the commissioning of new infrastructure.

Zimplats is therefore managing two connected transitions: replacing and expanding its mining base while strengthening the processing and energy systems required to extract greater value from its mineral resources. The September quarter's production decline captures the temporary cost of planned maintenance and changing mining operations, while the company's project expenditure reveals the scale of the longer-term restructuring underway.

The more important measure of progress through FY2027 will be the conversion of these investments into consistent final-metal output. If the furnace resumes reliably, concentrate inventories are processed as planned and Mupani continues towards its FY2029 capacity target, the current production interruption could remain a timing issue within a broader capacity expansion. If processing reliability or mine development falls behind schedule, the accumulated investment will take longer to translate into stronger operating performance.

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