zone humide (1) puits (1) alimentation en eau (1) qualité de l'eau (1) eau de surface (1) mise sous sequestre (1) fleuve (1) pollution (1) polluant (1) tourbe (1) cendre (1) métal (1) affluent (1) gypse (1) distribution (1) contamination (1) Metal sulfides (1) Work (1) Wetlands (1) Water quality (1) Water (1) Rocks (1) Pollution (1) Pollutants (1) Phosphates (1) Peat (1) Metals (1) Gypsum (1) Gold mines and mining (1) Comprehension (1)