I'm a mining engineer with previous experience as a rehabilitation planner in a coal mine. Technically I suppose I am guessing when I say that is a hill and it is not natural. However it is an extremely educated guess.

I assure you, it is a hill and it is not natural. It is clearly mine rehabilitation. I've been responsible for a very similar looking hill, in fact. Not quite as nice looking from a satellite photo I must admit, they've got a better shade of green.