Sunk in 1850 by the Tredegar Iron and Coal Co. Ltd.
An explosion at No.1 pit on the 16th of June 1865, claimed the lives of 27 miners, six of them being young boys under the age of 16. The death toll would have been very much higher if it wasn’t for the fact that the explosion happened on the night shift when there were fewer men underground. The manager was charged with manslaughter through gross neglect, however he was acquitted at the Assize Court because it was not proved that the ventilation at the pit was bad or that he had sanctioned the use of unlocked safety lamps.
Other explosions at this pit in 1879 and 1880 killed five and six miners respectively.