Call the mayor's hotline 12345 to report the sand mining field, or call the environmental hotline 12369.

Open area belongs to productive enterprise units. Quarries are mostly located in rock-rich areas, mostly in hills and mountains on land; Sand fields (sand fields) are mostly located in waterways and sand-rich areas, and are mostly built near waterways. Inland areas are built near rivers and lakes, and large-scale marine sand mining is built at the seaside.

. The production process of sand and gravel is mainly divided into two processes, namely mining and sorting. Its fixed place is mostly used for storage and sorting. A medium-sized production enterprise can produce hundreds of thousands of tons of sand and gravel every year, and a large enterprise can produce millions of tons of sand and gravel every year.