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Mardy Colliery, Rhymney, 1917.
This colliery was opened by the Rhymney Iron Company in 1862.
From the Inspector of Mines list 1896, there were 264 men producing steam coal from the Upper Four Feet, Big Vein and Elled seams.
By 1908 the workforce had grown to 393 men.
In 1918 there were 287 men employed.
From a report 1923, Mardy together with New Duffryn, employed a total of 1,801 men, producing from the Rhas Las, Clay, Yard, Red and Lower Four Feet seams.
Later the Powell Duffryn Company took over the running of this colliery.
Mardy was closed in 1925.