In conjunction with the continuous improvement in the Fischer-Tropsch process and catalyst, significant developments were also made in mining technology. Coal mining at Sasol from the early days has been characterised by innovation. Sasol Mining mainly uses the room and pillar method of mining with a continuous miner. Sasol successfully used the longwall mining method from 1967 to 1987. Today, Sasol is one of the leaders in coal-mining technology and was the first to develop in-seam drilling from surface using a directional drilling methodology. This has been developed into an effective exploration tool.