Anonymous wrote: mainly not getting the coal mixed with dirt and building a chute that will work with the front loader.
A little dirt won't hurt, rocks will though. I'd suggest a tarp but that won't work. Have the coal delivered while you have the loader there, they can just dump it into the loader bucket. I've done that before, wouldn't have time for that now though.
How steep would a chute have to be to get nut coal to pour down?
Depends on a lot of things. Coal size... larger sizes run easier with less pitch. Cleanliness.... cleaner coal runs easier. The quality of the coal... good coal runs easier too.
Genrally not much, rice the samllest needs about a 40 degree angle less even. That's across a aluminum chute though.