A dragline at Norwich Park Mine

Put this up for t'pit lads! Tom - control yourself!
These draglines are electrically powered gigantic beasts of machines, and weigh about 2500 tonnes, cost about $60million (£27million) and have a boom as long as a football pitch. A dragline can make a hole the size of an average-sized swimming pool with one scoop of the bucket. Pretty impressive stuff.
The function of these is after the land has been blown up with dynamite, to clear all the rubbish off the top of the coal seam (or something like that!). Every day's a schoolday.