Assessing local acid mine drainage impacts on natural regeneration-revegetation of Sao Domingos mine (Portugal) using a mineralogical, biochemical and textural approach

Sao Domingos sulfide mine was shut down more than 50 years ago leaving behind eroded and depositional surfaces due to acid mine drainage (AMD). The aim of this study was to assess six selected sites subjected to AMD, considered phytotoxic regions characterized by vegetation scarcity. Two main criteria, nature and composition of soluble fractions and total chemistry of surficial products related to jarosites presence, enabled to set up an overall dichotomy between superficial proximal/discharge and distal/sedimentation areas. Wet and dry sieving results comparison revealed that samples have a predominant sandy texture and lithic (phyllite, quartzite and volcanic country rocks) composition. Quartz, and subordinate feldspar enrichment is also detected in the coarse silt fraction. The results also suggest that the materials under study, when subjected to the local torrential hydrologic regime, have a high mechanical vulnerability, facilitating erosion and mud transport, both critical for vegetation support, and triggering contamination transfer and dispersion. The vicinity and ground-level surfaces of discharging areas are enriched in the jarosite group minerals whereas the sedimentation ones present hypersaline aluminous tendency. The formation of jarosite is considered as an efficient positive environmental contribution to metals and metalloids sequestration/immobilization. The remediation/revegetation solutions to be adopted in each location must have into consideration these differentiating aspects. (C) 2020 The Authors. Published by Elsevier B.V.

Automated summary

This study assessed six sites affected by acid mine drainage and found that the samples have predominantly sandy texture and lithic composition. The materials studied are mechanically vulnerable under local torrential hydrologic regime, facilitating erosion and mud transport. Discharging areas are enriched in jarosite group minerals, while sedimentation areas show hypersaline aluminous tendency.