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16. River filled  from sieving (Manombo)

River filled from sieving (Manombo)
One of the environmental impacts of sapphire mining results from sieving in rivers. The sieving sites fill up with mud and rocks, leaving them clogged and lifeless. The effects are felt downstream as well, as siltation resulting from muddy water flowing downstream harms aquatic plants and animals and clogs agricultural irrigation channels.