Photo taken on Oct. 31, 2017 shows the scenery of Zishan park constructed on the site of an abandoned mine in Handan City, north China's Hebei Province. (Xinhua/Wang Xiao)

Photo taken on Oct. 31, 2017 shows the scenery of Zishan park constructed on the site of an abandoned mine in Handan City, north China's Hebei Province. (Xinhua/Wang Xiao)

Photo taken on Oct. 31, 2017 shows the scenery of Zishan park constructed on the site of an abandoned mine in Handan City, north China's Hebei Province. (Xinhua/Wang Xiao)

Combo photo shows the scenery of Zi hill before (up) and scenery of Zishan park now on Oct. 31, 2017 in Handan City, north China's Hebei Province. (Xinhua)