 Today the oats arrive already processed, but the rest of the milling continues in the traditional style.The oats are hoisted to the bin floor at the top of the mill, from where they are emptied into a hopper that feeds one of the mill's two pairs of millstones situated on the mill floor.This pair of sandstone millstones shells the grain, and the output is then sent down a chute to the basement where the shelled oats ("groats") are separated from the husks using a fan.