A small leftwing environmentalist political party in Norway succeeded on Sunday in blocking plans to mine the sea bed at the bottom of the Arctic, by demanding the government scrap its first licensing round in return for support for the budget.

Norway has paused its controversial project to open up its seabed for commercial-scale deep-sea mining. Oslo had planned to let companies apply to mine 280,000 sq km (108,000 sq miles) of its waters for precious metals - an area bigger than the size of the UK.

Norway has suspended plans to start giving licences for deep-sea mining next year that had faced opposition from environment groups and international institutions, a party allied with the centre-left government said on Sunday.