At least three persons were feared to have been killed after the tailing stack of a mine collapsed at Cuddegal in Sanvordem in South Goa, western India, Friday evening, reported the Press Trust of India on Saturday. The incessant rains that have been battering the state for the last two days triggered the collapse around 20:30 p.m. local times, said the report. The rescue work began Friday evening at the mine which is owned by Sociedade Fomento company. An eye-witnesses claimed that the number of casualties could be more. The company spokesman said that they are yet to ascertain the exact number of casualties.