National Gypsum Company, Drywall, Cement Board, Gypsum ...
The largest gypsum quarry in the world is located in Nova Scotia and is owned by National Gypsum. National Gypsum mines and quarries gypsum rock, crushes and grinds it, and calcines it to remove chemically bound water. It adds starch and other additives and water to form a stucco slurry.