The spill into the farmland and into the Someş River resulted in levels exceeding permitted cyanide concentration by 700 times. The real problem was that the Someș river flows into the Tisza, which is Hungary's second largest river. The latter, in turn, flows into the Danube river, which flows through 10 nations and empties in the black sea. Overall, drinking water of over 2.5 million people was contaminated. Apart from cyanide, other substances left a long-lasting negative impact on the river and its shores. Some regions had up to 80% of the local wildlife die shortly after the spill.
http://sputniknews.com/in_depth/20150902/1026501357.html
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