OMYA • Gesso crudo e anidrite,Mons

NACE-BEL (BE 2008) : Extraction de pierres calcaires, de gypse, de craie et d'ardoise (08112)

NACE Rev.2 (EU 2008) : Quarrying of ornamental and building stone, limestone, gypsum, chalk and slate (0811)

ISIC 4 (WORLD) : Quarrying of stone, sand and clay (0810)

NACE Rev.2.1 (EU 2025) : Quarrying of ornamental stone, limestone, gypsum, slate and other stone (0811)