Mitsui has said it will trim its thermal coal assets in the long term but would continue to invest in coking coal - a key raw material for steel-making.
Glencore expected to achieve annual cash savings of more than $300 million in its coal business by the end of 2018, but now it expects savings of more than $450 million by year-end.
Nyrstar's CFO Michel Abaza said that no decision had yet been taken on how to tackle the company's debt levels but that the board would come back with a decision in the coming months.
