The company has exercised a right under the existing joint operating agreement.
An additional $45m is contingent upon achieving certain performance milestones.
Kosmos interest in the Deepwater Tano Block will increase from 18 to 22.05%, once the deal is complete in the second quarter of 2012.
The company’s interest in the Jubilee Field will increase from 24.1 to 25.8%.
The acquisition will be funded through a combination of cash on hand and borrowings.
