From spoil to… What will this heap become?

I stumbled upon an intriguing new feature in the Cleveland Hills today. Gazing westward, Highcliff Nab stands prominent in the background. A vast expanse of Guisborough Forest had been clear-felled and replanted with conifer seedlings. Amidst this scene, someone had built a conical mound of earth, about three metres high with a flat top. But why?

Initially, I suspected the handiwork of downhill mountain bikers, yet no trails emanate from it. There is also no trace of that mechanical digger has been there. Approaching it from the moor was manageable, though navigating the briars to reach the forest track left my legs scratched and sore.

I pondered potential explanations for this mound:

•    It could be a spoil heap left after excavation. Obviously, but that still doesn’t explain why.
•    It might be a landscaping feature meant to enhance the view from Guisborough. Unlikely.
•    It could be overburden, the layer of soil or rock above valuable deposits. Far-fetched.
•    Perhaps it has been stockpiled for later use. Unconvincing.

If anyone has any theories, please do enlighten me.