Quetta: At least 12 miners were killed and eight others were rescued after an explosion in a coal mine in the Zardalo area of Balochistan’s Harnai district, according to officials on Wednesday, according to Dawn. An official said that 20 miners were present inside the mine when a methane gas explosion took place overnight, leading to a collapse and the subsequent death of 12 miners.Quetta: At least 12 miners were killed and eight others were rescued after an explosion in a coal mine in the Zardalo area of Balochistan’s Harnai district, according to officials on Wednesday, according to Dawn. An official said that 20 miners were present inside the mine when a methane gas explosion took place overnight, leading to a collapse and the subsequent death of 12 miners.