Petropavlovsk swung to a net loss of $24.8 million in the first half on rising costs and lower sales but declined to give a forecast for the full year.
The union at Alcoa's aluminium operations said it was meeting with the company again on Wednesday to try to resolve a strike that has lasted more than six weeks.
Indonesia has increased its 2018 coal production target to around 507 million tonnes from a previous target of 485 million tonnes which may add to downward pressure on prices for the fuel.
Two major shareholders of Brazilian mining company Vale SA are likely to reach an agreement on Wednesday to pay 2.82 billion reais ($692 million) to Eletron to settle a dispute over Vale shares.
In a town where a 30-feet tall chair is the chief landmark, and which is synonymous with a U.S. furniture industry, many greet the possibility of tariffs on Chinese goods with a shrug.
China's top copper smelters have set their floor treatment and refining charges (TC/RCs) for the fourth quarter at $90 per tonne and 9 cents per pound.
BHP Billiton said on Monday its Kalgoorlie nickel smelter has been closed after a fire that broke out over the weekend and the plant will remain shut while it assesses the damage.