Geochemical constraints and heritage conflicts during cadmium stabilization of Zn-Pb-Ag tailings at a UNESCO World Heritage site

Research at the Tarnowskie Góry Lead-Silver-Zinc Mine reveals that while lead (Pb) and zinc (Zn) remain stable in tailings, cadmium (Cd) poses a latent risk due to its lability. Up to 74% of Cd is partitioned in exchangeable and carbonate fractions, which could be mobilized by rhizosphere acidification or carbonate depletion, despite negligible current aqueous leaching. The study proposes a dual-zone management model combining phytostabilization with native calcicolous species for stable slopes and 'invisible' chemostabilization using Fe-modified biochar in protected zones to immobilize Cd without altering the site's visual character or mobilizing background arsenic (As). This approach offers a scalable solution to reconcile environmental safety with heritage preservation, addressing the paradox of remediating historical mining waste under strict conservation laws.

Cabała, J., Warchulski, R., Kupczak, K., Kubica, W., & Krzątała, A. (2026). Geochemical constraints and heritage conflicts during cadmium stabilization of Zn-Pb-Ag tailings at a UNESCO World Heritage site. Scientific Reports, 16(1). https://doi.org/10.1038/s41598-026-48819-2