poor safety and management practices. As a result, there were nearly forty underground explosions in the Glamorgan and Monmouthshire areas of the coalfield during this time. Each accident resulted in the deaths of twenty or more workers – either directly in the explosion or by suffocation by the poisonous gases formed. The total death toll from these disasters was 3,119 people. The four worst accidents in Wales were: 439 deaths at the Senghenydd Colliery Disaster at Universal Colliery in Senghenydd, Glamorgan, in a gas explosion in 1913. 290 deaths at the Albion Colliery in Cilfynydd, Glamorgan, in a gas explosion on 25 June 1894. 272 deaths at the Prince of Wales Colliery, Abercarn, Monmouthshire, in an explosion of 11 September 1878. 266 deaths in the Gresford Disaster near Wrexham in North Wales on 22 September 1934. Some collieries, e.g. Morfa Colliery, near Port Talbot, Glamorgan, and Black Vein Colliery, Risca, Monmouthshire, suffered three disasters before they were closed for being unsafe. United States The Scofield Mine disaster occurred on May 1, 1900, near Scofield, Utah. At least 200 men died making it the worst mining disaster in the United States at that point. The Fraterville mine disaster occurred on May 19, 1902, killing 216 miners making it one of the worst in American history. Fraterville is located in western Anderson County, Tennessee. Also in the same year on July 10, 1902, the Rolling Mill Mine Disaster happened in Johnstown, Pa. It killed 112, many of whom had just arrived in town. At the time it was one of the region's most productive mines. The Monongah Mining Disaster was the worst mining accident of American history; 362 workers were killed in an underground explosion on December 6, 1907, in Monongah, West Virginia. The Marianna Mine Disaster occurred on November 28, 1908, in a coal mine near Marianna, Pennsylvania resulting in the death of 154 men from the explosion. The explosion occurred during shift change, as men entered the mine before the previous shift had left. Consequently, the mine contained many more miners than usual. Another accident occurred in the same mine on September 23, 1957, when an explosion killed 6 of 11 men in the mine. The Cross Mountain Mine disaster occurred on December 9, 1911, near the community of Briceville, Tennessee, killing 84 miners. The First Dawson Disaster was a mining accident on October 22, 1913, in Dawson, New Mexico