CPV code 44930000 designates Slate in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
44930000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 44900000 (Stone for construction, limestone, gypsum and slate).