摘要
•Dry Mediterranean climate induces marked long-term fluctuations in AMD hydrochemistry.•Precipitation of evaporitic salts within the galleries acts as a metal reservoir.•AMD remediation strategies must be preceded by at least 5 years of AMD monitoring.•New modular semi-passive treatments are required to face AMD long-term fluctuations.•The aggravating effect of climate change must be included in AMD remediation designs.