"We received the information after the victim was rushed to Sawahlunto Hospital. The vistim Ruslan, 28, was pronounced dead by the hospital," Sawahlunto police chief Adjunct Senior Commissioner Riyadi Nugroho said.
The explosion was allegedly occurred in a mining pit of PT Allied Indo Coaljaya (AIC), which is located not far from another pit operated by CV Bara Mitra Kencana, blasted a day before.
The police conducted thorough investigation in the location of the blast.
Meanwhile, a spokesperson of Sawahlunto Hospital dr Lusi Dewina said, paramedics have treated the victim for 30 minutes before he was pronounced dead.
Ruslan was a resident of Nias district in North Sumatra. He was allegedly died from serious injury on his back head.
Earlier on Wednesday, a coal mine in the area was reportedly exploded at 10.00 local time, injuring two miners.
The explosion is allegedly caused by an air blast.
"We recorded a sudden increase of methane gas that would reach an explosive level when reacted with air," a mining technical official Andi Asmunandar said.(*)