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Markham Colliery disaster
On 31 July, 1973, 18 coal miners lost their lives and a further 11 were seriously injured in a mining accident at the Markham Colliery at Staveley near Chesterfield, Derbyshire, England.
== Accident in 1973 ==
A descending cage carrying the men failed to slow down as it approached the bottom of the mine shaft and 18 miners were killed by the impact. The accident was caused by fracture of the brake-rod, when a slowly growing fatigue crack reached a critical size and the brake-rod parted.
Following a thorough investigation it was found that metal fatigue failure occurred in the braking mechanism used to slow down the cage as it descended.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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