Rockhopper Mobilizes Rig to Ernest Prospect

Rockhopper was re-assigned operation of the Ocean Guardian drilling rig at 09.00hrs local time on July 21, 2010.

The Ocean Guardian is currently being moved to the Company's Ernest prospect located on license PL024 in the North Falkland Basin where, after arrival and mobilization, it will drill the Ernest 26/6-1 Exploration Well (100% Rockhopper). Drilling operations on Ernest are
expected to take approximately 30 days. A further announcement will be made on spudding of the well.

On completion of the Ernest 26/6-1 Exploration Well, it is currently anticipated that the Ocean Guardian will return to Rockhopper's Sea Lion 14/10-2 Well (100% Rockhopper) to conduct tests on the oil discovery.

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