methane concentrations, but was kept active because of the value of the equipment left behind. Russia Several major mining accidents have happened in Russia, particularly the Ulyanovskaya Mine disaster of 2007, which killed at least 106 miners. On January 20, 2013, at least four miners have died and four more are missing following an accident at a Russian coal mine. The accident happened at a coal mine in the Kuznetsk Basin region of Russia, in western Siberia. In November 2021, the Listvyazhnaya mine disaster took place in Listvyazhnaya; many people were trapped. Spain The history of mining in Spain has left a number of major mining accidents with hundreds of victims. The majority of the accidents and casualties have happened in the North of Spain and are particularly related to coal mining, mainly due to the collapse of structures and gas explosions. Though, the worst recorded accident took place in Villanueva del Río, Sevilla, in the Southwest of the country on 28 April 1904, killing 63 people and leaving several more injured. South Africa A number of major mining accidents happened in South Africa including the following accidents: 57 deaths on 12 September 1944 at Hlobane Colliery near Vryheid, Kwa-Zulu Natal 437 deaths on 21 January 1960 the Coalbrook mining disaster occurred at Coalbrook North colliery. Coalbrook North colliery was one of the underground collieries of Clydesdale (Transvaal) Collieries Limited and was situated near Sasolburg in the Orange Free State province 177 killed on 16 September 1986 at the Kinross gold mine in Evander, Mpumalanga. This is still the world's worst metal mining disaster. 104 deaths on 10 May 1995 at Vaal Reefs number two shaft near Orkney, in the North West, was arguably one of the worst to befall mining in South Africa. 64 deaths on 12 September 1983 at Hlobane Colliery near Vryheid, Kwa-Zulu Natal 53 deaths on 13 May 1993 at Middelbult colliery. Middelbult colliery was and is still one of the underground collieries of Sasol Mining situated near the town of Secunda, Mpumalanga Taiwan The three worst mining accidents in Taiwan all happened in 1984: On June 20, 1984, in in Tucheng District, a runaway mining cart struck a high voltage transformer and triggered an explosion. 72 miners died from carbon monoxide poisoning. On July 10, 1984, 103 miners died in in Ruifang District as a result of carbon monoxide poisoning caused by a fire started