Fire at Nexa Resources’ Peru zinc smelter injures workers, is contained

A fire at Nexa Resources’ Cajamarquilla zinc smelter in Peru injured four workers before the emergency was brought under control, underscoring how quickly a single industrial blaze can become both a labor-safety incident and a supply-chain risk.

The injuries involved one Nexa employee and three contractor workers from Hitachi, a reminder that major metals facilities depend on a mix of direct staff and outside crews to keep production moving. The cause of the fire was not immediately clear, and questions remained over how long operations might be disrupted beyond the short term.

Cajamarquilla matters well beyond the plant gates. Nexa says the smelter has plant capacity of 344.4 thousand tonnes a year and 99.92% ownership, and company materials describe it as the largest smelter in the Americas. The site sits in Peru, about 24 kilometers east of Lima in the Lurigancho-Chosica and Huachipa area, placing it at the center of both a national industrial network and a dense urban corridor.

That location makes the fire relevant not only to Nexa and its workers, but also to downstream manufacturers that rely on zinc and to local authorities watching industrial safety in a region where processing plants sit close to population centers. Even a contained blaze can interrupt output, tighten supply, or expose how much spare capacity exists in a market that depends on large, specialized facilities.

The episode also comes after previous disruption at the same plant. Nexa said on June 26, 2025 that Cajamarquilla operations were partially and temporarily suspended after a strike began the day before. The company later said on June 30, 2025 that full operations had resumed at normal capacity. That recent labor history adds another layer to the fire, showing a strategic smelter that has already been vulnerable to stoppages from both workforce conflict and safety events.

Peru is one of the world’s important metals producers, and zinc processing is a critical step between mining output and industrial use. When a major smelter such as Cajamarquilla is forced to halt or slow, the consequences can extend from plant workers to global buyers who count on steady refined-metal flows. Even though the fire was contained, the injuries and the shutdown risk point to a larger question facing the mining and metals sector: how resilient is critical processing capacity when one accident can ripple through jobs, production and supply chains at once.