Boliden Garpenberg Zinc Mine to Run at 30% Capacity After Seismic Damage

Boliden, Zn mine

Boliden Garpenberg zinc mine output will be sharply reduced after abnormal seismic activity damaged key parts of the Swedish operation. Boliden said it would restart production in the second quarter at about 30% of guided capacity.

The mine was halted on 15 March after seismic activity caused a rockfall and pressure wave. Production is expected to restart at around 100,000 t/month, but the disruption will continue until further notice.

Boliden Garpenberg zinc mine production is important for European zinc supply because Garpenberg is one of the region’s key underground zinc assets. A prolonged reduction could tighten concentrate availability and increase attention on mine stability, grade control, and supply reliability.

Lappberget Damage Limits Near-Term Production Recovery

The main operational issue is damage to the upper parts of the Lappberget orebody. This area accounts for around 70% of Garpenberg’s production, making the seismic event highly material for Boliden’s zinc output.

Boliden said production in the most affected part of the mine is not expected to resume this year. Inspections are still ongoing, and the company will operate Garpenberg at reduced capacity until it has clearer visibility on safety and mining conditions.

The lower output profile also comes with a slight expected deterioration in average zinc grade. This means the disruption affects not only tonnage but also the quality and efficiency of mined ore.

European Zinc Market Faces Fresh Supply Risk

Boliden Garpenberg zinc mine guidance now points to output running at just 30% of the mine’s 3.7mn t/yr guided capacity. This creates a meaningful supply risk for European zinc concentrate flows, especially if the reduced operating rate lasts longer than expected.

The disruption also highlights the vulnerability of underground mining operations to seismic instability. Even profitable and well-established mines can face sudden production constraints when access to major orebodies is restricted.

For zinc buyers and smelters, the key issue will be how long Garpenberg remains limited and whether alternative concentrate supply can offset the shortfall. The market will also watch for updates on inspections, rehabilitation work, and any revised production guidance from Boliden.

The Metalnomist Commentary

Garpenberg’s setback shows that mine safety and geotechnical risk can quickly become supply-chain issues. For Europe’s zinc market, the disruption adds another reminder that regional metal security depends on operational resilience, not only reserve size.