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NATURAL NANOTECHNOLOGIES IN GOLD MINING
Abstract
The processes of nanogold deposition and concentration in the environment, which have been occurring with enlargement of metal grain size, may be considered as the natural nanotechnologies. The mechanisms of nanogold concentrations in geological objects are established and described on the example of many deposits in Russia (the Urals, Siberia) and abroad (Canada). They produce different morphological and chemical aggregations of gold nanoparticles. Among them variable growths on the placer metal surface, globular, biomorphic gold, and aggregates of many-compound mixtures of ferriferous, siliceous or aluminous substances with nanogold are presented. The methods of highresolution electron microscopy give the opportunity to reveal the proofs of manyleveled structure of these formations. The functioning of natural nanotechnologies in a number of gold deposits has been already providing an increase in gold reserves. The detailed analysis of such processes is needed for working out of new technologies for gold mining, especially for deposits with refractory ores. The results of experimental works are useful for decision of this problem, too.
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