The Ahmeek Mill was a copper processing mill. Copper-bearing rock from the Ahmeek mine would be sent down to the mill (on the shores of Torch Lake) in trains. At the mill, the rock was pounded into tiny particles by giant steam-driven hammers. One of those hammers is actually still standing today -- I may show it in a later post.
However, this part of the mill isn't the part with the hammers. This is a long line of identical poured-cement rooms, all with these doors leading through them. The rooms are empty nowadays, and a handful have heavy metal doors attached to them. I have no clue what part of the milling process went on in them. At least they gave a cool photo!