You need a few abandoned mine shafts with vertical drifts; have a few of them on the property (old patented mining claim), just drop the garbage down then blow the overhead.
Have to keep them fenced off for the dogs and wildlife.
Rest of the place I put into orchards, barley field and vegetable gardens.
But you never can tell when you might need a very deep, dark hole.
My area is full of colonial era pits from the iron ore miners.
And porcupines.