Samuel Obiri, one of the research scientists, said that these activities had also resulted in the release of toxic chemicals such as heavy metals (mercury, arsenic, cadmium, lead, manganese) into the river.
He commented during the release of the document at a day’s dissemination workshop here Thursday that the release of such toxic chemicals into the rivers was of great environmental concern because of their potential long-term effects on human health.
http://www.spyghana.com/mining-activities-threaten-ghanas-water-mdg-results/
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