Columbia City Mill Service Co.Columbia City Mill Service Co. is the premier supplier of low cost aggregate in the area. If you are looking for stone for unimproved roadways, need to fill a low-lying area, have a parking area or farm lot in need of durable, long-wearing material, look no further. Slag aggregate offers a durable material that will hold up under heavy truck traffic and provide long service life, at a very reasonable cost. Material sizes available include: 1 x 0 Duraberm, 1 x 0 Steel Furnace Slag and 2 x 1 slag.For more information call Kurt: 219-406-1194