Norway, Western Europe's biggest oil and gas producer, had planned to become one of the world's first countries to start handing out rights to tens of thousands of square kilometres (miles) of seabed.

But the small Socialist Left Party said it had blocked the move in return for supporting the minority government's 2025 budget.

"There will be no announcement of exploration rights for deep-sea mining in 2024 or 2025," the party said in a statement.

The energy ministry did not immediately comment on the move. But Prime Minister Jonas Gahr Stoer said it was only a postponement. "We should be able to accept that," he told TV2 television.

Parliament gave approval in January for allowing mining rights for some 280,000 square kilometers (108,000 square miles) of seabed.

The energy ministry later drew up a list of zones covering about 38 percent of this area in the Norwegian Sea and Greenland Sea that would be sold in 2025.

Norway had argued that it did not want to rely on China for minerals essential for renewable energy technology.

It believes there is copper, cobalt, zinc and rare earths in its continental shelf. All are needed for production of batteries, wind turbines, computers and mobile phones.

Deep-sea mining is controversial for its potential impact on vulnerable marine ecosystems. Environmentalists say there is a threat to the habitats of sea species and from potential noise and light pollution from the machinery used, plus a risk of chemical leaks.

The government said there were tough safeguards in its proposals for mining and that licences could be revoked.

But scientists, non-government groups, some multi-national companies and international institutions such as the European Parliament had opposed the move.

The World Wide Fund for Nature launched legal action against the rights sale last Thursday. It welcomed the postponement in a message to AFP but said it would not halt its court challenge against the legality of the government decision.

Fellow environmental group Greenpeace's head for Norway, Frode Pleym, called the announcement "a crucial win in the fight against deep-sea mining".

"It should be the nail in the coffin for the destructive industry," he told AFP.