Riddle: Black I am and much admired, men seek me until they’re tired. When they find me, they break my head and take from me my resting bed. What am I?
I am aware that we do not live in 19th century England. It has been a long time since the industrial revolution. But do you know? Coal is still an important raw material!
Generally, men work in mines. Moreover, the conditions are not very good. Coal mining, which is a difficult and risky business, is quite tiring as the puzzle says!
So what do miners do when they find coal?
They break it and bring it to the surface.
The reason why he describes the place where coal is found in the riddle as a “resting bed” is that coal has to remain underground for hundreds of years to form.