Confirming the clearance of safety zones ahead of planned explosions is one of the uses.

This was the company's second lowest monthly sales figure this year.

Diamond miners are seeking new approaches to battle falling demand and competition from diamonds manufactured in laboratories.

The nature of the commercial agreements between Nyrstar and Trafigura has long been the subject of speculation among insiders in the metals industry.

GlobalData also predicts silver output in 2019 will continue to decline to 913.5 million oz.

Norway's Equinor has signed preliminary agreements with seven potential industrial customers for its project to develop carbon dioxide storage under the North Sea.

The voluntary liquidation, following board approval, would be completed by the end of 2020.