Photo taken on Jan. 23, 2017 shows the renovated Shenhai salt well in Zigong, southwest China's Sichuan Province. The salt well, dug in 1835, is believed to be the oldest salt well with a depth of more than 1,000 meters in the world. (Xinhua/Jiang Hongjing)
Photo taken on Jan. 23, 2017 shows the renovated Shenhai salt well in Zigong, southwest China's Sichuan Province. The salt well, dug in 1835, is believed to be the oldest salt well with a depth of more than 1,000 meters in the world. (Xinhua/Jiang Hongjing)
A worker processes the salt at the renovated Shenhai salt well in Zigong, southwest China's Sichuan Province, Jan. 23, 2017. The salt well, dug in 1835, is believed to be the oldest salt well with a depth of more than 1,000 meters in the world. (Xinhua/Jiang Hongjing)
