Water inrush characteristics andhazardeffectsduringthe …
closed loop of the pit is 270 m. To exploit the deep-seated ore bodies, the mining method transitioned from open-pit mining to underground mining, and some mine roadways were excavated. The outcropped strata in the study area include the Archaean Anshan group, Lower Proterozoic Liaohe group and Cenozoic Erathem Quaternary overburden.