The Milling Process Step 1: Grain is augured inside from the outdoor bins. The grain is cleaned using a screen air cleaner. Step 2: The now clean grain is stored in a hopper inside to bring the grain to room temperature and to the proper moisture level. Step 3: Once dry, the grain goes into the first stone mill which has two 20 inch pink granite stones. One stone stays stationary while the other slowly spins. Step 4: Once milled the first time, the flour is blown into the sifter. The sifter is composed of several screens that vibrate. To make a whole wheat flour, coarser screens are used in the sifter. For a sifted flour, finer screens are used. Step 5: Flour that is not yet quite fine enough is augured into a smaller mill which has two 12 inch pink granite stones. Once milled a second time, it is sent back into the sifter. Step 6: Once the milling is done, the flour is augured into a hopper where it is bagged.