"The sulphur-iron mine is located at the common boundary of Sichuan, Yunnan, and Guizhou province, with an area of 1774 square meters. The Yong Ning River originated from here, flowing northward 108 kilometers into the Yangtze River. The mine was established in 1950 and its products are mainly exported, with some concentrated uses within in the county. We found this place in the newspaper by accident; it's called Big Tree... see more