Around three hours later, a mine 25 kilometres (16 miles) to the west at Spin Carez collapsed in similar circumstances, killing seven of the nine miners inside.
Two bodies had been recovered and several injured labourers were evacuated on Saturday.
Now rescue is trying to find other people who could be under the rubble.
While we pray that relevant quarters succeed in their efforts to recover the trapped miners, it is also high time that both the federal and provincial governments take requisite steps including passage of relevant laws to ensure that adequate safety standards are observed at the mines by the operators and efficient rescue services are available so that poor miners could stay safe who had to work in the most hard conditions to make both ends meet. They were shifted to the Bolan Medical College Hospital's burn unit and four of them, who had suffered serious injuries, had been admitted there. Authorities said the incidents were not linked, and that rescue operations had ended at both sites.
Details about what led to the explosion weren't immediately available. Balochistan is rich in minerals but its mines have a poor safety record.
"There were no arrangement inside the mine, including air ventilation", Akhterzada, an injured coal miner told Al Jazeera.
The demonstration culminated with the adoption of a resolution by the participants, calling on Chief Justice of Pakistan Mian Saqib Nisar to take suo motu notice of the mine accidents.
According to the Pakistan Central Mines Labour Federation (PCMLF), about 100 to 200 labourers die on average in coal mine accidents every year.
The protesters also demanded Rs2 million be given to bereaved families of the coal miners.