developer using a compressed air drill underground

Miners known as Developers worked in pairs to drill a pattern of holes into the tunnel face using drills powered by compressed-air.   

Two machine men or 'developers' worked together to drill a pattern of holes into the face of the tunnel. The holes were then charged with blasting gelatine - a powerful explosive - and fired with electric detonators. This would extend the tunnels underground to reach and follow the lode. Developers could extend tunnels at a rate of about 2.4 metres (8 feet) per day.


Photograph reproduced with the kind permission of Chris Elson held by the Geevor Archive

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