May 2026 has witnessed a cascade of zinc smelter disruptions that, while individually manageable, collectively represent a material tightening of seaborne refined zinc supply at a time when ex-China markets were already running lean. A declared energy emergency in Peru, a fatal industrial accident at Glencore's Kazzinc operations in Kazakhstan, and a fire at the Cajamarquilla zinc refinery in Peru have combined to remove meaningful tonnage from the spot market and accelerate LME stock draws. (FACT: Metal.com, 2026)
The most systemically significant disruption is unfolding in Peru. The Peruvian government has declared an energy emergency in response to a structural shortfall in natural gas supply and hydroelectric generation capacity. For the country's mining and smelting sector — a major contributor to global zinc concentrate and refined metal output — the energy emergency has translated into power rationing measures that constrain smelter operating rates. The impact is felt most acutely at Peru's zinc refineries, which require stable, high-voltage electricity to maintain electrolytic zinc production. Any sustained reduction in power availability forces smelters to either reduce current efficiency (lowering output per cell) or shut down cell houses entirely. (FACT: Metal.com, 2026)
In Kazakhstan, Glencore's Kazzinc operation has suffered a fatal industrial accident that has prompted an operational review and, in line with standard safety protocols, a temporary suspension or slowdown of affected production units. Kazzinc is a vertically integrated producer of zinc, lead, copper, and precious metals, and any interruption to its zinc refining circuit has direct implications for seaborne concentrate and metal availability in Central Asia and the broader European market. While the company has not disclosed the full extent of the production impact, market participants are pricing in reduced output from the operation through at least June 2026. (FACT: Metal.com, 2026)
The third disruption is a fire at the Cajamarquilla zinc refinery in Peru — the country's largest zinc refinery and one of the most significant in Latin America. The fire, reported in May 2026, caused an immediate shutdown of parts of the refinery. Cajamarquilla has an annual production capacity of over 300,000 tonnes of refined zinc, and even a partial or temporary shutdown removes thousands of tonnes from the spot market each week. When combined with the energy emergency affecting broader Peruvian smelter operations, the Cajamarquilla fire represents a concentrated supply shock originating from a single geography. (FACT: Metal.com, 2026)
The market impact is visible in LME inventory data. LME zinc stocks have been trending downward through May 2026 and are now at approximately a one-month low. The drawdown reflects both the disruption-driven tightening of supply and the broader structural deficit in the ex-China market. With Chinese zinc surplus effectively trapped behind a closed import arbitrage window, the seaborne market cannot easily compensate for lost Peruvian or Kazakh production. The tightening of LME inventories in the face of these disruptions suggests that physical premiums for prompt delivery zinc are likely to rise, particularly in European and US markets where the disruptions are felt most directly. (FACT: Fastmarkets, May 2026)
LME zinc prices are trading in the $3,400-3,500/t range, with cash settlement at $3,437/t as of April 21, 2026, supported near the 40-day moving average. The disruptions in Peru and Kazakhstan provide short-term price support by removing prompt supply from a market that was already balanced on a knife edge outside China. However, the medium-term outlook is complicated by the broader global surplus dynamics: concentrate supply is growing, and Chinese smelter capacity remains ample. The question is whether these disruptions persist long enough to draw LME stocks to critically low levels before the surplus can redirect. (FACT: Fastmarkets, May 2026; Metal.com, 2026)
For the second half of 2026, the trajectory of supply recovery at these three disrupted operations is the key variable. Peru's energy emergency is a structural power issue that may take months to resolve, suggesting that Peruvian zinc output could remain constrained well into H2 2026. Kazzinc's accident may resolve more quickly, as safety reviews and partial restarts are typically measured in weeks rather than months. The Cajamarquilla fire falls somewhere in between — the extent of damage will determine restart timelines. Market participants should expect ongoing news flow from all three events. (FACT: Metal.com, 2026)
The concentration of zinc smelter disruptions in May 2026 is a clear signal to buyers with exposure to seaborne supply: expect higher physical premiums, particularly for prompt delivery into European and US markets. The Peru energy emergency is the most consequential of the three events because it is systemic (power infrastructure) rather than operational (a single accident or fire). If Peruvian smelter constraints persist into H2 2026, the zinc supply chain will need to find alternative sources of refined metal. Taiwanese, South Korean, and Indian smelters are the most likely alternative suppliers, but they will charge a premium for spot tonnage. Buyers should lock in Q3 and Q4 volumes as early as possible and build inventory positions ahead of potential further disruption escalation.