ovoidhead
I'm not too sure where you got the "$4 to sp" from. Did you read this article?
The decision highlights the risk of oil and gas investment in Africa, analysts said. In October, the explorer agreed to an exclusive sale of its 23 percent stake in Jubilee to Exxon, in a deal valued at $4 billion
http://www.bloomberg.com/news/2010-08-18/kosmos-cancels-4-billion-sale-of-jubliee-oil-fields-in-ghana-to-exxon.htm
