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“Roc Oil (Mauritania) Company, a wholly owned subsidiary of ROC, advises that as at midnight (local time) on 3 May 2008, the Banda NW ST-1 sidetrack well had been suspended.

The results of the wireline logging, Modular Dynamic Tester (MDT) pressure testing and sampling indicate that Banda NW ST-1 intersected an 85 metre gross gas column, with 15 metres (18%) net gas pay and a 15 metre gross oil column, with 10 metres net oil pay (67%).  The fluid contacts were as expected and the well is interpreted to be in communication with the original Banda-1 discovery well drilled in 2002, approximately 2 kilometres to the east.  The Banda Field is in approximately 300 metres of water and spans PSC Area A and PSC Area B.

The Atwood “Hunter” will commence with the planned well intervention work on the Chinguetti Field, once it has completed the move from Banda NW ST-1.”

Participating Interests in the PSC Area A Joint Venture are:

ROC Group Companies  4.155%
 PC Mauritania I Pty Ltd (Operator)  53.846%
 Tullow Oil plc  24.300%
 Mautitania Holdings B.V  13.084%
 Fusion Mauritania A B.V  3.000%
 FP Mauritania A B.V  1.615%

Participating Interests in the PSC Area B Joint Venture are:

 ROC Group Companies  3.693%
 PC Mauritania I Pty Ltd (Operator)  53.846%
 Tullow Oil plc  21.600%
 Mauritania Holdings B.V  11.630%
 Premier Oil Mauritania B Limited  9.231%

Commenting today, Aidan Heavey, Chief Executive of Tullow said:

“The success of Banda NW and its sidetrack has presented a clear opportunity to drill an appraisal well in the east of the field to assess the size of this exciting oil and gas discovery. Additionally, data from these wells will prove invaluable in our evaluation of the remaining exploration potential of the offshore Mauritanian acreage”.