Coarse sand is mostly applied where there is aggressive material removal because of its bigger abrasive particles. From the construction perspective, coarse abrasive sand is critical in sandblasting used to scrub and roughen surfaces. Coarse sandblasting is also used in preparing concrete surfaces for painting, as well as in removing rust from steel structures. In the mining industry, it can be used in the breakdown of large scale ore samples. The rough, coarse abrasive particles of sand cut through materials, leaving rather rough surfaces. Usually, fine grained abrasives are used to refine these surfaces.