With the increasing demand of artificial sand, pebble, granite, basalt or other materials become the main source of sand. Pebble is also from rocks, rock fall into the river, has long been scouring, abrasion, leaving the hard part. Smooth appearance and inner hardness makes it hard to be broken, directly into the mechanism of sand…
With the high development of hydroelectric project, which is of high technology, the artificial sand and stone material has a great demand.
Gold yield from placer gold, from MaiJin. MaiJin production in 75 to 85% since the 70 s, placer gold accounts for 15-25%. Sand gold ore dressing methods Native gold deposit show the earth’s surface, because of the mechanical and chemical weathering, containing gold vein gold either parent rock is broken gradually become cuttings and gold…