pvolcko wrote: I meant to say the ice will sublimate, not evaporate.
Had to look that up.
One thing to add about the freezing is that it's a strange animal. Over the breaker even during the coldest days the piles of rice never fully freeze. Suppose if we dump a big pile of soaking wet coal onto a pile. The top layer will form a crust that might be about a foot thick the next day however through the process of sublimation
the top of this will dry out so you'll have a dry unfrozen layer then a few inches of frozen stuff and then wet coal under if it's left undisturbed. That coal will stay wet for an entire winter and never freeze as long as the pile is big enough.
Overall as long as you keep most of the moisture out of it you won't have any problems. One issue that might crop up is if it can't drain or you have a an opening at the bottom. The water may freeze up in such areas and the lower it is in the bin the dirtier it is. Ice coal and coal dust is much tougher than just ice, it's not very easy to break at all.