Tarenni Colliery 1858, when the Primrose Colliery was owned by Morgan and Lewis, fumes of an engine boiler suffocated 14 men and boys, and 7 horses. According to HM Inspectorate of Mines and Quarries data, outside the Gwendraeth valley, Tarenni Colliery had the highest set of recorded incidents for coal damp and methane gas explosions. In total during its production lifetime, there were six outbursts in which three men lost their lives: one on 12 December 1914; two on 17 February 1941. On 1 November 1909, water from the abandoned Ynysgeinon pit caused the death of five miners at Tarenni No.2. On
Merrimack Valley gas explosions his smoke alarm went off; as he was extinguishing it he heard a boom from a neighbor's house and the ground shook. All of the fires were put out by 6:45pm. One man was killed when a chimney fell on his car, twenty-five others were reported injured, and Lawrence General Hospital received three patients including one firefighter. Once it was realized that the fires were being caused by over-pressurized gas mains, residents whose gas is supplied by Columbia Gas were told to evacuate their homes. There is no indication that foul play was involved. Gas services for approximately 8,000 residents