Spread Dirt order

[Quasarrgames]

Got the idea from the book The Martian, when Mark Watney makes growable soil out of martian dust by mixing it with earth dirt and feces.

Why can't our colonists do this? Break up a small layer of stone with their mining skills, then mix the stone chunks with some dirt and poo and make a tile of farmable soil? It would be a great feature for mountain or icesheet bases instead of immediately resorting to overpriced hydroponics basins.

just a thought