11.   You could hire people who used to mine coal to build and maintain them.

12.   Coal still is mined by stripping away vast stretches of farmland and forest, digging out open pits and leaving sterile moonscapes.

13.   Coal is mined in Central and South Sumatra and South and East Kalimantan.

14.   Shen was growing vegetables, although most inmates at the camp were forced to mine coal, the group said.