Gratis billeder : monument, statue, milepæl, skulptur, mindesmærke, kunst, public domain, lumixfz200, greymouthnz 2400x1703
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Traditional mining was highly dangerous. There were three main causes of accidents: rock falls, often when the pillars were mined; explosions, most frequently occasioned by firedamp (methane gas given off by coal), which was usually ignited by a miner’s naked flame; and tubs travelling on the haulage system knocking men over.
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