Gravel mine belongs to alluvial placer; Gold is existed as natural gold statement.

The content of natural gold is up to 99%, its density is 16-19 t/m³, hardness is 2.5-3.0. its size is a little big, there is little content which size is less than 0.074mm. There are two ways to select the gravelmine, re-elect separation and washing separation. Its process is: gravelmine is primary cycloned by jigging; then sieved into the different sizes; at last, elected by shaking table. Typical process is as follows. Lipu Heavy Industry can provide vibrating screen, jigging and shaking table used in gravelmine beneficiation.