A Glencore climate plan is facing greater scrutiny following a report that the company is understating methane emissions from some of its Australian coal mines.

The miner sold 53.6 million tonnes of iron ore in the quarter, down 9.6% year-on-year.

Rio has also had to contend with a delay in production from a new greenfields mine.

Alphamin announced in November it was seeking a strategic review to maximize shareholder value.

S&P raised Yamana to its lowest investment grade last week, citing an expectation that the company will maintain low debt leverage ratios over the next several years.

Creditors may now present an alternative plan for the debt restructuring.

Las Bambas accounts for 2% of global copper supply.