Is it legal to dig sand to earn money?

Sand mining is a relatively profitable activity, and bidding for river sand mining is very profitable and can obtain rich benefits. River sand mining refers to activities such as sand digging, quarrying and earth borrowing within the scope of river management. The profit of the sand and gravel factory is very considerable. Sandstone mining is a special industry and a potential opportunity to make money. The prospects are good. The sand and gravel mining industry will maintain steady growth and its scale will continue to expand.