The covering realised in 2008-2009 relates to a waste heap which is owned by Iberpotash since 1998 when the site was privatised together with other potash mining sites in the region.
Cependant, bien qu'elles acceptent cette conclusion, les autorités espagnoles soutiennent que les obligations d'Iberpotash n'incluaient pas la gestion du terril de Vilafruns.