Streams draining tin mines (Lysogorskiy, Tayozhniy) and silver mines (Serebristiy) contained increased concentrations of microelements in the ecosystem components, in particular, in mosses and water periphyton (Chernova et al., 2013) due to the mines and tailings present in the territory. It is expected that the concentrations of heavy metals in the sediments of the streams near the mines will also be increased.