New Tredegar Colliery
- New Tredegar, Rhymney Valley
Following its sinking in 1854 the New Tredegar Colliery was beset with geological problems, mainly landslips, however the colliery still employed 1,670 men in 1913. In 1930 a second major landslide covered most of the surface at New Tredegar Colliery and resulted in the closure of the colliery.
On 2 of December 1875 a minor gas explosion occurred near to the coalface badly injuring two men. Subsequently the mine workings were inspected and found to be free of gas. However, the manager decided as a precaution that no men should enter the pit for at least 24 hours. His orders were disregarded and the next morning, under the instructions of the overman William Evans, the men descended the pit as usual. At 8.00 another explosion occurred and 20 men were killed instantaneously with another two dying later from their injuries.