Thereby, this kind of vertical mill is usually as fine as sand, also called sand gold.Placer deposit is a significant source of gold, placer mining was the main method used in the early years of many gold rushes, like the California gold rush.Next, I will do a description of the following aspects:

A hilly area is a place where gold is concentrated. 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 a dynamic 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.The confluence of rivers or streams plays an important role in the search for gold deposits, the eddies generated at the confluence enhance the deposition of gold particles.