In addition, Core announced that its West Elk longwall mine in Colorado is now executing at consistent productivity levels following a period of transition associated with its move to the B-Seam, and Core expects that improved performance to continue in future periods. "On behalf of the entire board and management team, I commend the operations team for making safety their highest priority in the successful recovery, repositioning, and restart of the longwall system," said Jimmy Brock, Core's chairman and c ...