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
Ballingarry Coal Mines crisis. Maintenance of the mines was continued for a period, and disaster was narrowly averted in 1973 when an underground fire threatened the lives of 17 workers. Despite these efforts the mines closed, and with the pumps disconnected the pits flooded. The second oil crisis resulted in soaring fuel prices, and it appeared the mines would once again be seen as a viable enterprise. In 1978, Kealy Mines commenced explorations in the area. The name derived from the surnames of its two principals, Patrick Keating, a civil engineer originally from Ballylooby in Tipperary and Gilbert Howley, a native of Co.