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To reveal the effect of coal mining on the content of trace elements in the environment and human bio-substrates in the Republic of Sakha (Yakutia). The representative sample consisted of 90 children, aged 7 to 17, who have been permanently residing in the coal mining region since their birth. The study of the content of 11 microelements in human hair was done by mass spectrometry. Of the huge variety of the mineral resource base of Neryungri, only deposits of coal, gold, underground and mineral waters are now inv...