There are essentially three different types of conveyor belt used to carry coal. In underground mines, safety has to be the primary concern.
For this reason, very thick ‘solid woven’ belts using PVC or rubber protective outer layers are almost invariably used because they provide the greatest possible resistance to fire.
Steel cord belting is normally used above ground when very long distances are involved, which can be several kilometres, because elongation (stretch) can be a problem.
Steel cord conveyor belts are made using a layer of steel cords bonded together with rubber and covered with layers of protective rubber ‘covers’
Rubber multi-ply belts, manufactured using layers of extremely strong but flexible synthetic fabric, are usually the preferred choice for most other uses above ground, including open cast mines.