Subsidence occurs when the support roofs of old mines collapse, causing the ground to sink.
This project will fill in the abandoned mine workings with a concrete-like substance, minimizing the potential for surface subsidence and surface structure damage. Below are commonly asked questions about the project. Also, check out the Weekly Status Reports to follow the project to completion. Overburden in the area of the subsidence control project ranges from 10 - 40 feet. The coal seam averages 8-10 feet in thickness.