KGHM Polska Miedź plans to construct Poland’s first polyhalite mine, based on the Mieroszyno deposit near Puck Bay. The geological resources are estimated at over 300 million tons, and the mineral will be used primarily for fertilizer production.
The state-owned copper giant signed a letter of intent with the Pomeranian Voivodeship on Friday to cooperate on the project, dubbed „PUCK.” Polyhalite is a mineral containing potassium, magnesium, calcium, and sulfur — key nutrients for agriculture. Thanks to its low chloride content, it can be used for sensitive crops such as fruits, vegetables, and oil plants.
KGHM has been conducting exploration in the Puck Bay area since 2014 under a concession for potassium-magnesium salt deposits. The geological documentation for the Mieroszyno deposit was approved by the Minister of Climate and Environment in June 2025.
A strategic investment for Polish agriculture
The planned mine would significantly reduce Poland’s dependence on imported potash fertilizers, which are currently sourced mainly from Russia, Belarus, and Canada. Domestic production would strengthen food security and stabilize prices for farmers. The Pomeranian Voivodeship expects the investment to create hundreds of jobs and boost the local economy.
KGHM’s CEO Remigiusz Paszkiewicz emphasized the long-term nature of the project. The design phase along with environmental, administrative, and concession decisions will take four to six years. Construction of the mine shafts, reaching a depth of 750–800 meters, will require another eight to ten years.
Long road to production
– I think that in 12 to 14 years we should start full exploitation of this site – said Paszkiewicz. The timeline reflects the complexity of underground mining in a region with specific geological and environmental conditions. The company will need to conduct further feasibility studies and secure all necessary permits before groundbreaking.
Polyhalite mining is a new venture for KGHM, which traditionally focuses on copper and silver extraction. The project aligns with the company’s diversification strategy and the EU’s push for critical raw materials independence. Environmental groups have already raised concerns about the impact on the coastal ecosystem, and public consultations are expected to be part of the process.
Źródło: WNP.PL, Fot. materiały prasowe KGHM
