Four killed in Jharkhand as roof of illegal mine collapses Updated: Updated: The illegal mica mine is located in a dense jungle in Jharkhand’s Koderma district. Share Article The illegal mica mine is located in a dense jungle in Jharkhand’s Koderma district. Four persons were killed and two injured when the roof of an illegal mica mine caved in, in Jharkhand's Koderma district, a senior official said. Koderma Deputy Commissioner Ramesh Gholap told PTI that six persons were trapped when the roof of the illegal mine caved in on January 21 evening. Two persons were rescued by local villagers. The bodies of four others, including a woman, were recovered from the rubble on January 22.