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ADVANCE FOR SATURDAY MARCH 18 AND THEREAFTER - In a Tuesday, Feb. 28, 2017 photo, Rob Bottegal, head engineer of the Acosta Deep Mine for Corsa Mining, looks at an overview of the mine while explaining the layout, at the Acosta Deep Mine, in Jenner Township, Pa. The Canonsburg-based company is on schedule to open its Acosta Deep Mine in May, with a plan for at least 70 miners to remove about three miles of metallurgical-quality coal over the next decade.  (Dan Speicher/Pittsburgh Tribune-Review via AP)

ADVANCE FOR SATURDAY MARCH 18 AND THEREAFTER - In a Tuesday, Feb. 28, 2017 photo, Rob Bottegal, head engineer of the Acosta Deep Mine for Corsa Mining, looks at an overview of the mine while explaining the layout, at the Acosta Deep Mine, in Jenner Township, Pa. The Canonsburg-based company is on schedule to open its Acosta Deep Mine in May, with a plan for at least 70 miners to remove about three miles of metallurgical-quality coal over the next decade. (Dan Speicher/Pittsburgh Tribune-Review via AP)

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