These primary gold-bearing geological bodies can be either primary gold ore bodies, gold-bearing altered rock belts, fractured fracture zones, or wide area gold-bearing rock masses rock formations.
In the same area, where the gold placer is concentrated where the relative height difference changes from large to small.
The gold particles are transported and moved by various natural forces and will be deposited in a favorable geological environment.
The riverbed alluvial deposit is the most important source of gold deposits in gold production.
Alluvial deposits are formed by a series of deposition processes.

The deposition is raymond mill process, due to the lateral movement of the river channel, the location of the river alluvial gold deposit in the valley is generally not consistent with the current river channel, often occur on the side of a moving curved channel or downstream of a river.