Now, it will convert that site to a 257-acre underground mine with somewhere between three and seven portals. Neiswonger will be extracting Benwood limestone using a room and pillar method, where ...

During the signing of the executive order on Tuesday, February 11, while talking about reducing the size of the federal ...

with builders using a mining system known as the ‘room and pillar’ method to remove limestone from the complex. What’s left is a huge underground space with 17 foot high ceilings ...