"Gold is always found in very small amounts and its extraction
becomes complicated. To separate gold fom other minerals dangerous
substances are used, such as mercury and sodium cyanide, whose
neglectful use near rivers can cause irreparable damages to the
ecosystem and human health. Of course, such chemicals do not reach their
hands by magic, but they are "managed" through state agencies.
"In the case of cyanide death is quick, but poisoning with heavy metals
such as mercury tends to lead to a long suffering, such is the case of
umans who eat fish contaminated with mercury can be poisoned.
http://www.ahora.cu/en/sections/holguin/14689-illegal-gold-mining-a-major-concern-in-holguin
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