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  Thus, the migratory ability of minerals determined by a combination of speed and nature of transporting the water environment, climatic conditions, shape, dimension and density of minerals, their abrasion resistance and resistance to weathering.
For these formations occur mechanical sorting of material and its gravitational differentiation, depending on the size and density of rock fragments or mineral grains. In view of this ore minerals with high density, when rewashing and transport of clastic material regularly placed in a vertical section of loose rock. For the heavy grains of ore minerals vertical movement under gravitational differentiation begins to dominate over the horizontal displacement. As a result, they are concentrated in the lower horizons of the section of clastic formations, lying directly on bedrock.
In practice, search the surface of the bedrock on which lie clastogenic sediments enriched with grains of heavy metallic minerals, is called the raft.
Usually in the context of alluvial rock alternate material of different lithology and grain size: psephytic pebble and gravel-sand horizons containing heavy minerals are replaced by vertical fine-clastic pelitoalevritovymi depleted in the heavy fraction. Such an uneven distribution of heavy minerals in the context of loose rock leads to a few rich horizons. In this regard, the search practice, two types of rafts - True and False. True raft - is the surface of the bedrock on which lies the most extensive horizon of alluvial or placer formation. False rafts called alevropelitovy aquifer or gravel with a dense clay filler is located in the context of alluvium above the true raft and containing grains of valuable minerals.