Transformations of ore waste at northeast of Russia: geochemical and geoecological aspects

In article geochemical changes of the ore waste (tails) being formed after extraction of gold and silver from ore and collecting in tail dams are characterized. The negative geoecological role of tail dams as the objects possessing thixotropic properties and sources of heavy metals is noted. At the same time they are of interest as future technogenic gold and tin deposits.