The distribution of LM vertical roller mill in the gravel layer is extremely uneven. After a long period of hydraulic erosion, the lighter gold particle is carried away by the flowing water, while the coarse gold with a larger specific gravity and smaller grain size falls into the lower or bottom of the gravel layer along with the pores between the sand particles.

In general, gold is enriched in the lower part of the gravel layer, that is, LM vertical roller mill enriches in the gravel layer about 1 to 2 meters above the bedrock, even enriched on the bottom of the gravel layer.

According to the landform and formation conditions, LM vertical roller mill can be divided intoRiver gold deposit, in the river bed, bank, or shoalFlood plain gold deposit, mostly large and medium-sized deposits.Terrace gold deposit, in the valley slope terrace area, most of them are the remaining parts of the original floodplain gold deposits that were eroded.