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Mine rescue teams constructed substantial stoppings in the D Northeast Mains between
Nos. 13 and 14 Crosscuts. Monitoring locations were re-established further in the mine. Work on extending the horizontal degasification pipe in the D Northeast Mains inby No. 14 Crosscut continued. It was a difficult, slow process.

Drilling continued at Borehole 2. Difficulties in drilling continued.

A gas concentration encountered on December 19 at the Borehole 1 sampling location was approximately: Methane-61%, Oxygen-2.3%, Carbon Monoxide-132 ppm, Carbon Dioxide-20%, and Hydrogen-19 ppm.