After peaking in 2007, uranium prices have disappointed and, it seems, many of the stocks are looking to de-emphasize their connection to the metal. (Involves BHP Billiton, Rio Tinto, AngloGold Ashanti.)
See http://www.mineweb.com/mineweb/view/mineweb/en/page72103?oid=113312&sn=Detail&pid=102055.