Bricks Galore! Used Brick

Ive been searching over the summer for used bricks to build with. I finally found what I was looking for on Craigslist last week. About 20 miles from my home is this old corn bin. The owner wants it tore down and removed from his lot. There must be 8,000 plus bricks here for me. With the bin ruins also comes a large pile of brick rubble. The bricks are in mostly good condition though some are broken in pieces.

Are the clay tile holes along the side for grain drying?

There are four firebrick arches along the bottom.

Can anyone give me ideas as to how this worked? It has my curiousity up.