Gemfields’ $125m Montepuez impairment: production, plant and cost lessons for mine teams
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
Gemfields will book a $73.5 million half-year loss after a $125.2 million impairment at its Montepuez ruby mine in Mozambique, lifting the cumulative writedown on the asset to $65 million as premium ruby grades and recoveries lag expectations. The PP2 processing plant, designed to triple capacity from 200 to 600 tonnes per hour, has intermittently exceeded nameplate throughput but remains in final commissioning after transformer damage, excessive component wear, equipment defects and choking cut availability. Management has cut group operating costs by 17%, raised $30 million via a rights issue and sold Fabergé for $50 million as it focuses on stabilising Montepuez output and maintaining auction-driven cash flow.
Technical Brief
- PP2 commissioning issues include excessive component wear, equipment defects and localised choking, reducing plant availability.
- Management is revising mine planning to better target higher-grade zones across the large licence footprint.
- Security and operational disruptions from illegal mining have delayed PP2 completion and complicated controlled access to ore faces.
- Earlier delays stemmed from damaged transformers, transport constraints and difficulty securing specialist electrical work permits.
- Monitoring and remediation now focus on stabilising PP2 throughput, improving operating consistency and validating recent recovery improvements before updating long-term grade forecasts.
Our Take
The fresh $125.2 million impairment at Montepuez comes on top of a year in which Gemfields’ total revenue and EBITDA were already sharply down, as flagged in the 26 March 2026 results piece, so lenders and contractors on African coloured‑gemstone projects should assume tighter capital discipline and slower discretionary spend into the rest of 2026.
With Montepuez ramped to 600 t/h but facing grade volatility and illegal mining, the risk is that higher throughput simply accelerates depletion of marginal material; operators in similar African gemstone belts may take this as a warning to invest earlier in grade‑control and security rather than in plant capacity alone.
The stronger auction performance at Kagem highlighted in the 11 September 2026 article suggests Gemfields’ Zambian emerald mine is now the more reliable cash generator, which likely shifts internal capital allocation and technical focus away from Mozambique and towards sustaining and expanding Kagem’s output quality.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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