The share price of exploration company AfNat surged by 50% in London on Wednesday morning, after the company announced that it was forming an exploration joint venture (JV) with a subsidiary of the Rio Tinto group. AfNat is listed on London’s Alternative Investment Market (AIM).
See http://www.miningweekly.com/article/rio-tinto-forms-mozambique-jv-with-explorer-afnat-2010-06-09.