INFLUENCE EXTRACTION OF ALLUVIAL GOLD ON TURBIDITY KOLYMA RIVER

Questions anthropogenic changes in river water quality, the number of the transported substances are of great scientific and practical importance. Purpose – to explore the impact of extraction of alluvial gold on the long-term fluctuations in the turbidity of the water in the Kolyma river. Method of research – a joint analysis of long-term fluctuations, and the value of water turbidity and gold mining. Analytical approximation of trend lines held by least squares method using computer editor Excel. Elevated background turbidity is noted in 60–70 years of the twentieth century, due to the intensive development of gold deposits in the Kolyma basin. An increase in production of the metal in the years 1958–1970 by 36%, the average turbidity for the period increased by 28%. Since the beginning of the 70s came a period of decline in gold production, a decrease in the turbidity began in the mid-70s. This delay is due to the fact that the broken gold-floodplain after mining still continues to be an additional source of fine particles of rocks in the river. But for several years the floodplain are overgrown, and they cease to be an additional source of this. Increased turbidity in the late 70s due to construction work on the dam is the Kolyma hydroelectric power. In the 80 years the trend to reduce the turbidity is consistent with a decrease in gold mining. The average turbidity for the years 1971–1998 decreased by 64% while reducing the volume of gold production by 45%. The decline in gold production and the consequent reduction in water turbidity in the Kolyma river, should favorably affect the river ecosystem.

Keywords

Turbidity of the water, suspended sediments, gold mining, river discharge.

Issue number: 9
Year: 2016
ISBN:
UDK: 504.05+556
DOI:
Authors: Ushakov M. V.

About authors: Ushakov M.V., Candidate of Geographical Sciences, Senior Researcher, e-mail: mvilorich@narod.ru, North-East Interdisciplinary Scientific Research Institute named after N. A. Shilo, Far East Branch, Russian Academy of Sciences, 685000, Magadan, Russia.

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