GILLETTE, Wyo. (AP) — An Arch Coal executive says coal prices will determine when the company's idled equipment in the Powder River Basin is brought back into production.

Arch President and CEO John W. Eaves says there needs to be sustained improvement in the coal market before the idle equipment is brought back online.

Average sales price for PRB coal declined 30 cents per ton in the third quarter this year from the second quarter .But Eaves says that the company believes better prices could be in the offing next year because of declining coal stockpiles.

Arch's Coal Creek and Black Thunder mines in Campbell County have produced 83.4 million tons of coal so far this year.