An expert records the soil samples at Dawang township of Anxin county, North China’s Hebei province, July 1, 2017. The geological survey has started in Xiongan New Area, a new economic zone near Beijing.[Photo/Xinhua]

An expert welds a pipe at Dawang township of Anxin county, North China’s Hebei province, July 1, 2017. The geological survey has started in Xiongan New Area, a new economic zone near Beijing.[Photo/Xinhua]

Experts take the soil sample at Dawang township of Anxin county, North China’s Hebei province, July 1, 2017. The geological survey has started in Xiongan New Area, a new economic zone near Beijing.[Photo/Xinhua]