The 2.3km drift tunnel had been sealed 30m from the portal entrance since November 2016.
The 2.3km Pike River coal mine drift tunnel had been sealed 30m from the portal entrance since November 2016.
The 2.3km drift tunnel had been sealed 30m from the portal entrance since November 2016, with double airlock doors behind a 800mm wall of concrete. PRRA chief operating officer Dinghy Pattinson...
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