This is expected to lead to Peabody's share of the joint venture's adjusted earnings before interest tax depreciation and amortisation in the third quarter to be US$30 million to $35 million lower than the second quarter figure of $228 million.

"Middlemount restarted operations in August in a new area of the mine, with shipments resuming recently," the company said.

During the second quarter, Peabody's share of the Middlemount Mine shipped approximately 600,000 short tons and contributed $10 million to adjusted EBITDA.

Peabody also expects reduced pricing on seaborne met and thermal coal, with seaborne prices lower than second quarter average prices.

There are also demand-driven deferrals on seaborne thermal and metallurgical coal shipments, with third quarter met coal volumes expected to be modestly below second quarter levels of 2.1 million short tons.

"For the full year of 2019, recent trends suggest capital expenditures and seaborne coal volumes are expected to come at the lower end of the targeted annual range, with metallurgical coal costs now expected at the higher end of the annual range," Peabody said.