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In page Illegal mining:

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Illegal gold mining operations often use heavy metals such as mercury and cyanide to extract gold from waste material. The mercury and cyanide leaches into the natural environment causing pollution.[1] Illegal miners often dump excess mercury into the nearby waterways for disposal.[citation needed] Water pollution affects surrounding aquatic and land ecosystems due to the hydraulic cycle.[2] The polluted water is also used for irrigation of farmland and as drinking water, which further spreads pollution and leads to illness and death.[1]