Gravel is exposed at the surface of the weathering of rocks and Stone Crushing Equipment Innovation sedimentary; often at the foot of the mountain and piedmont; or because the rock erosion by water after breaking, produced by river erosion after deposition; gravel cemented after the formation conglomerate or breccia. Gravel can be used for paving, the gravel road is even more than the asphalt cement road and aggregate. Important material of fine gravel or the production of concrete.
Gravel industry is sizeable today, and gravel supplying company is densely covered all over the country, and the number increase of gravel plant has also brought a lot of problems: First, the increase in the number of gravel plant causes great environmental pressures, and the increase in the number of gravel plant also needs more mines and quarrying area.
Second, the increase in the number of gravel plant leads to the low utilization of mining area and enormous waste of resources.
Third, the increase in the number of gravel plant causes the unreliable quality of gravel. Sometimes, some of them cannot be used, but have been applied by public relations, leaving the security risks. These are difficulties in development of gravel industry, so the State addresses the problems in gravel industry together the control and integrating of mineral resources.