Among the concerns the Ministry noted was a reduction in the availability of potable drinking water, as rivers have become laced with mercury and sediment due to widespread dredging, which has also resulted in the deaths of many fish and aquatic plants. The activity has also eroded riverbanks as fallen trees, gravel deposits, and sediment have altered the flow of waterways and have made many rivers impassable during the dry season.
http://nacla.org/blog/2012/7/13/everything-glitters-isn%E2%80%99t-green-guyana
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