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Cwm and Mon Colliery.
Situated on the eastern side of the valley at Cwm, this colliery is first mentioned in the Inspector of Mines list 1880.
It is again mentioned in the 1896 list when the owners were Monmouthshire and Cwm Collieries Co. At this time there were 124 men employed here producing coal from the Tillery seam.
By 1908 the number employed was 105.
It also went by the name of Cwm North and South levels and Cwm Red Ash.
In 1918 and 1923 there were 76 and 33 men employed respectively, producing from the Tillery and Red Ash seams.
Later Jones and Emmanuel became the owners.
In 1938 E. H. Bennet and Co. Ltd. owned the Cwm South level employing 58 men.
It closed in the early 1940's.
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Cwm and Mon Colliery (Red Ash)