A few thoughts:
- one of the pics looks like it has elbows and a flat section of pipe. To get the coal to flow without augers, vacuums, etc. you need to maintain a fairly steep downward slope as straight as possible.
- I'd suggest getting the bulk delivery well ahead of the heating season, so it has plenty of time to dry.
- would it be possible to use a gravity wagon to handle the movement from the driveway to the back? If you fill it with a loader and move it when the ground is firm, you'd eliminate a lot of shoveling, trudging , etc. when conditions are bad. And those wagons funnel the contents to a door that could be rigged to accept an auger or pipe, so it could take the place of the bin altogether. (Note: even the small ones normally hold around 5 tons, but have no brakes.
When loaded, they should be moved with care and with suitable equipment, particularly if there are any terrain issues.)