The Ohio Aggregates & Industrial Minerals Association (OAIMA) is the trade association in Ohio that represents all of the state's mining operations, except coal. These commodities include mostly construction materials, both natural and man-made, such as aggregates (which are sand, gravel, slag, and crushed limestone, dolomite, and sandstone), salt, clay, shale, gypsum, industrial sand, building stone, lime, cement, and recycled concrete.