An excavating machine known as a roadheader in the Pike River mine. These machines were designed to bore through rock and coal, but sparks from the steel cutting tools caused small methane explosions.
'Roadheader machine in Pike River mine', URL: http://www.nzhistory.net.nz/media/photo/roadheader-machine-pike-river-mine, (Ministry for Culture and Heritage), updated 17-Nov-2015
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