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
Hospital Hill fire miles away because of the gas fire on Hospital Hill. Although the fire at the borehead was not a direct threat to the town of Roma, there was a fear that a nearby gasometer, which stored the town's supply of gas, would ignite. When gasometers are full, excess gas must be allowed to escape as a safety measure. The Roma gasometer was full and the excess gas was venting only 250 feet from the fire. If the venting gas came into contact with the flames it would have ignited and caused the entire gasometer to explode. Decisive action was needed