The coalmine was one of the largest in the Netherlands, and it was closed around the mid-70s.
The drawing is based on old photographs and old memories.
Unfortunately there is nothing left, they tore down literally everything, and replaced the area with houses. Only us, the ones who grew up back then, can still see the scars. The bicyclepaths (once railroads), the wooded hills (once coalhills), the black earth (once cokesovens). They even tore down the original hyperbolic cooling towers - which were invented here. Well, you can see those all around the world, that would be the Emma offspring.