Abstract
The principal gold-bearing zone of the Kolyma-Chukotka fold belt is controlled by the Yana-Kolyma downfold of the earth's crust identified on the basis of gravity prospection data; it involves thick (25 km) terrigenous formations and their underlying migmatites as well as the lower layers of the earth's crust and asthenosphere. The Yana-Kolyma downfold is formed under the influence of the protogenic asthenospheric ultramafic magma chamber. According to the analysis of the most important ore-controlling factor (the thickness of the erosion cut), the structures of the deep Yano-Kolyma downfold are the least eroded, and, consequently, the rich placers of the principal gold bearing zone might have been formed from very rich gold motherlodes. This conclusion determines inferred resources in the principal zone and conforms with the calculated ratio of motherlode reserves exceeding placer reserves. The gold ore ratio of 2.6 is used for the prognostic evaluation of the ore gold mineragenic potential of the Kolyma-Chukotka fold belt, which makes 6 000 t.
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