Awwal 18, 1432 H/Feb 21, 2011, SPA -- Prince Abdulaziz bin Salman bin Abdulaziz, Assistant Minister of Petroleum and Mineral Resources for Petroleum Affairs, confirmed that 87 countries will sign the International Energy Forum Charter in Riyadh tomorrow with other parties sign the document later. In a press conference here this evening to highlight the convening of the International Energy Forum in Riyadh tomorrow, he said the conferees would discuss the papers scheduled to be presented on the conference's table, noting that the floor would be given chance to raise whatever relevant issues according to the time frame.