Why is no one testing for mercury in the waters? Inorganic mercury poisoning can also kill fish and cause the symptoms of gastroenteritis. If without using a retort miners burn off mercury from the amalgam with gold above 300°C then it can form mercury oxide, which though sparingly soluble in water, can wait to react with water of low pH (caused, eg, by nitrates generated by thunderstorms), or salt (eg, from disposed cooked food). This is distinct from the formation of methylmercury, which is a chronic neurotoxin and a bigger problem.
http://www.stabroeknews.com/2012/opinion/letters/01/21/there-is-no-report-of-what-tests-were-done-on-the-water-of-the-haieka-river/
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