Zambia’s Major Copper Smelters Face Extended Shutdowns, Raising Supply Concerns

Why It Matters

Reduced copper output and sulphuric acid scarcity threaten supply chains for both copper and cobalt, potentially driving up prices and prompting operational cutbacks in the DRC, the world’s top cobalt producer.

Key Takeaways

• Mopani and Chambishi smelters face 40‑45 day and two‑month shutdowns.
• Sulphuric acid output drops, leaving Zambia with near‑zero export capacity.
• DRC miners may cut cobalt output due to limited acid supply.
• Zambia’s copper production missed 1 million‑ton target, underscoring underinvestment.
• Global copper market tightens as African supply constraints intensify.

Pulse Analysis

Zambia’s copper smelting sector is entering a critical maintenance window that will reverberate across the global metals market. Mopani Copper Mines, which has deferred major overhauls for years, plans a brief three‑day pause in June followed by a 40‑45‑day shutdown from August to mid‑September. Chambishi Copper Smelter will also suspend operations for about two months starting in August. Both facilities generate roughly two million metric tons of sulphuric acid annually as a by‑product, a chemical now in short supply due to the extended outages and recent export permit restrictions. The domestic shortage forces Zambia to prioritize local mining needs, effectively halting acid exports that traditionally flowed to neighboring Congo.

The ripple effect reaches the Democratic Republic of the Congo, home to the world’s largest cobalt reserves and the second‑largest copper producer. With sulphuric acid inventories in Zambia at critically low levels, Congolese miners are already curbing chemical usage, a move that could depress cobalt output and exacerbate supply gaps for battery manufacturers. This situation compounds existing disruptions caused by the Iran‑related conflict, which has strained global leaching‑chemical markets. As a result, both copper and cobalt supply chains face heightened volatility, prompting traders to reassess inventory strategies and pricing models.

Long‑term, the episode underscores chronic underinvestment in African mining infrastructure. Zambia fell short of its 1 million‑ton copper production target last year, while Mopani operates well below its 225,000‑ton capacity. The combination of aging assets, extended maintenance, and policy‑driven export controls tightens global copper supply, supporting higher price forecasts for the remainder of 2026. Stakeholders—from mining firms to downstream manufacturers—must navigate a landscape where supply constraints and geopolitical risks intersect, making strategic sourcing and diversification more critical than ever.