What conducts the structure supporting the coal seam in the underground mine?

The structure that supports the coal seam in an underground mine is referred to as a pillar. Pillars are critical because they provide the necessary support to prevent the collapse of the mine workings, ensuring the safety of miners and the stability of the mine. These structures are left in place during the mining process to help bear the weight of the overlying rock and maintain the integrity of the tunnel systems.

While other terms are also related to mining, they serve different purposes. The rib refers to the side walls of a tunnel created during coal extraction, and the roof is the upper surface of the mine that needs to be supported but does not serve as a structure to bear weight independently. A portal, on the other hand, signifies the entrance to the mine, facilitating access but not providing support to the coal seam itself. Therefore, the role of a pillar in supporting the coal seam is pivotal for safe mining operations.