Mystery buildings near the tracks

      One of my favorite pursuits when traveling through small towns, especially in the U.P., is to get off the main road and find the old commercial buildings near the rail road tracks.
     I can often identify what they were used for, warehouses, railroad depots, but many times I can't. I just call them mystery buildings.
     The one, at left, is near the tracks in Newberry. Because of the town's lumber past, I suspect it could have been a mill or storage building for timber waiting to be shipped via rail.
   The photo, below, was taken in Marquette and looks like a similar building, but I suspect it could be mining related.
     If any readers can tell me what they are, I'd appreciate it.