Globally, tailing impoundment failures frequently occur, making safely held hazardous materials mobile. The pore water within the tailings can have (near-) neutral pH due to acid neutralization before tailings disposal, leading to the generation of neutral mine drainage (NMD) as it leaks from the impoundment. The biogeochemical evolution of key elements, particularly Fe, and the associated mobility of toxic trace metals, including arsenic (As), in these NMD scenarios remain insufficiently explored. In this study, we investigated the oxidative weathering of NMD originating from a gold mine tail...
