The wooden plates of different forms and the chutes for ore dressing unearthed among the ruins of the Shang and Zhou Dynasties (21th century B.C.-221 B.

• 江西铜岭、湖北铜绿山等矿冶遗址出土的商周选矿遗物，其年代久远，保存完整，为国内外罕见。