To date 13 Frontier Exploration Licences have been issued under two Rounds, five in the Erris and Slyne Troughs in 1994 and eight in the Porcupine Basin in 1995.
Licences issued in the Slyne and Erris were: 1. Four blocks to Enterprise Oil plc.; 2. Four blocks to Enterprise Oil plc., and Santa Fe Minerals (Ireland) Limited; 3. Three blocks to KerrMcGee Eire Exploration Limited, Aran Servicing Limited, and Monument Resources (Germany) Limited; 4. Eleven blocks to Statoil (UK) Limited, Union Texas Petroleum and Rimrock Offshore Limited; 5. Six blocks to Texaco Britain Limited and Repsol Exploration (UK) Limited.
These licences are valid for 16 years over four phases of four years each. During the first phase the licensees have an obligation under their agreed work programme to acquire in excess of 5,000 km of seismic gravity and magnetic data. The licensees carried out a joint shallow core-hole project in 1994 also under their work programme. To retain a licence beyond the first phase licensees will be obliged to commit to at least one exploration well during the second phase.