ASM produces about 20% to 30% of the world’s gold every year, contributing about 500 t to 800 t.
NanoStruck says about 650 t to 1000 t of mercury is released through ASM into the environment every year, owing to poor environmental management practices. ASM also accounts for about a third of all human-released mercury.
Other environmental problems associated with ASM include the direct dumping of tailings and effluent into rivers, improperly constructed tailings dams, acid rock drainage from mining areas and absent or improper mine closure procedures
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