Clontarf Energy PLC - London-based oil and gas explorer - Shares tumble as it permanently abandons its Sasanof-1 exploration well northwest of Onslow in Western Australia. The well was drilled to 2,390 metres without incident. However, no commercial hydrocarbons were intersected, and the well will now be plugged and permanently abandoned, it explains.

Current stock price: 0.11 pence, down 70% on Monday

12-month change: down 68%

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