Peabody Energy intends to permanently seal the area where high methane levels have been concentrated after it reported fire in its North Goonyella mine.
The US imposed the tariffs on Canada and Mexico in June. Although Canada and Mexico agreed a renewed continental trade deal last week, the measures remain.
The company's IPO of 20 million shares was priced at $17 per share on Wednesday, below its target range of $18 to $20 per share. The IPO raised $340 million.