The contents of mercury in the lake ecosystem in the zone of gold-mining enterprises (Southern Ural)

In the gold-miming enterprises environment one can observe an accumulation of Нg in bed silt within the water area and coastal zone of Lake Kalkan. It is established, that the basic source of Hg in the lake is the river Juravka. There are recorda of the HG accumulation in fish in the lakes of Southern Ural which is dangerous for residential population.