Abstract
The modern plain and mountain river valleys had the maximum depth at the beginning of Quaternary. Buried alluvium in the valleys occurs at different depth and is in different states of preservation due to Quaternary intra-valley alterations. But placer mineral content is richest in the most ancient alluvium. That is why the quaternary valley history and the state of preservation of buried alluvium play an important role in the heavy mineral placers prospecting.
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