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The injection of gaseous carbon dioxide into the fire area through a Gob Ventilation Borehole was completed on December 7. Approximately 9.0 million cubic feet of carbon dioxide was injected into the mine.

Borehole 4 was started and completed by December 9. This hole was approximately 250 feet deep and was located inby the No. 10 Crosscut on left side of the D Northeast Mains. This borehole was located between the mine portals and the last known fire area. Sampling at the borehole indicated a stable atmosphere in the mine.