0810Quarrying of Stone, Sand, and Clay

excavation and cutting of decorative/monumental stone and building stone, such as marble, granite, and sandstone; | excavation, crushing, and separation/breaking of limestone and anhydrite; | mining of chalk and uncalcined dolomite; | production of granules, small fragments, and powders derived from extracted rocks, whether heat-treated or not; | extraction and dredging of industrial sand, construction sand, and gravel; | crushing and crushing of stone and gravel; | sand quarrying; | mining of clay and clay and kaolin refractories.