LINTHICUM HEIGHTS, Md.—A roof collapse is hurting production at one of Foundation Coal Holdings' underground mines.

The Linthicum Heights, Md.-based company said Thursday the collapse will force it to reduce production at the Emerald Mine near Waynesburg, Pa., for at least two weeks. Foundation did not say when the roof fall occurred.

Foundation says it declared "force majeure" on coal shipments from the mine, meaning it claims it cannot deliver the coal because of extraordinary circumstances. Foundation says the production shortfall will be made up by the end of the year.

Foundation operates 13 mines in West Virginia, Pennsylvania and Wyoming.

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