Placer Deposit - an overview | ScienceDirect Topics
7.3.5 Alluvial Placer Sampling. Alluvial placer deposits are formed by weathering, transportation, and deposition of valuable minerals. The large alluvial placer platinum deposit at the Ural Mountains in Russia is an example of such deposits discovered way back in 1823. In general these deposits are less consolidated, loose, and soft materials.