Exposure to fine particles of silica has been shown to cause silicosis, a serious and sometimes fatal lung disease. Employees who inhale fine particles of silica may be at risk of developing silicosis. Employees create silica dusts when they grind, cut, drill, or crush materials such as rock, masonry, tile and concrete. The small particles easily become suspended in the air and, when inhaled, penetrate deep into employees’ lungs.