Skarn has also created mine-by-mine carbon intensity curves for gold, silver and cobalt, to be published over the coming weeks.

Country is planning to raise surveillance of copper and aluminum imports while developing policies to curb shipments from China and other Asian nations to protect domestic producers, said two government sources and an industry official.

South Crofty is considered the most important tin mine in the UK and hosts one of the highest grade tin resources worldwide.

Callinex shares were up 20% after the company announced new high-grade copper, gold, silver and zinc lenses at its Pine Bay project.