I discussed this on IRC the other day, but I will put this here so that it has the possibility of being picked up by a skilled mod dev.
Put as simply as possible, this mod would be a modular multiblock ore processing system. I am thinking Mekanism-esque processing, but in a multiblock instead of a long processing chain of machines. You would improve the efficiency of the ore processing by having certain blocks, which would have their own requirements (extra fluids, other blocks in the structure for cooling, additional items) and certain layouts within the structure would give bonuses in different ways with the same blocks (such as processing speed, energy efficiency, and output). But most importantly, you could stop at whatever level of complexity you desired.