The UNGRD is coordinating rescue efforts at the mine, located near the town of Riosucio in a mining belt that extends across parts of Caldas, Antioquia and Risaralda provinces, EFE news agency reported. The National Mining Agency (ANM) said preliminary reports pointed to flooding as the cause of the cave-in. Authorities were working to determine whether the mine was properly licensed or operating illegally. Illegal mining is widespread in Colombia.