Quarrying of stone, sand and clay

This class includes:

• quarrying, rough trimming and sawing of monumental and building stone such as marble, granite, sandstone etc.
• quarrying, crushing and breaking of limestone
• mining of gypsum and anhydrite
• mining of chalk and uncalcined dolomite
• extraction and dredging of industrial sand, sand for construction and gravel
• breaking and crushing of stone and gravel
• quarrying of sand
• mining of clays, refractory clays and kaolin