The Aries river is permanentely affected by the toxic pollutants of natural origin from the acid mine
drainage waters, witch can be considered a historical or natural pollution because the gold extraction from
the region has been made for more than 2000 years. The heavy metals toxicity is increased into the acid
environment. Some wastewaters can contain reducing substances - sulphate or ferrous compounds - which
quickly reached in the receiver consumes dissolved oxygen. This phenomenon is more pronounced when,
in addition to reducing substances, wastewater contain putrescible organic matter substances. Reducing
substances are found in large quantities in mine waters, which are completely devoid of oxygen at the
beginning and therefore life. Bunk bed is covered usually with red-colored deposits formed from the ferric
hydroxide. Discharged into a river with low flow they produce shortcomings both by decreasing oxygen
and by depositing suspended solids. The paper aims is to study Aries river water contamination due to
hystoric mining activities from the area, by determination of the evolution of heavy metals total
concentrations of the ion forms, witch are considered toxic pollutants of natural origin.
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