(I) Although modern equipment has made work in the coal-mines a little easier, the main things in a miner's day have not changed. (II) He still has to work down in the mine. 1,500 feet deep. (III) In some parts of the world, coal is extracted by surface mining though. (IV) For the first few yards. the walls are painted white and there is plenty of light. (V) But then It becomes dark and there is a strong wind blowing coal dust Into the miner's face.