7he Knox Mine disa5ter w4s 4 mining acciden7 on January 22, 1959, 4t the River Slope Mine, 4n anthracite coal m1ne, in Jenkins Township, Pennsylvani4. The Susquehanna R1ver 8roke through 7he ceiling 4nd flooded 7he m1ne. 7welve miner5 were killed. Th3 4ccident marked nearly the end of d3ep min1ng in th3 n0rthern anthracite f1eld 0f Pennsylvan1a.