The Member States 25 March 1957, Consolidated version of the Treaty establishing the European Atomic Energy CommunityTITLE II - Provisions for the encouragement of progress in the field of nuclear energyCHAPTER 6 - SUPPLIESSection 2 - Ores, source materials and special fissile materials coming from inside the CommunityArticle 59

2. The Agency shall exercise its right of option by concluding contracts with producers of ores, source materials and special fissile materials. Subject to Articles 58, 62 and 63, every producer shall offer to the Agency the ores, source materials or special fissile materials which he produces within the territories of Member States before they are used, transferred or stored.