The accident took place in Loralai district’s Dukki town, located some 145 kilometers (90 miles) off the provincial capital of Quetta. Initial reports suggest the mine caved in because of a blast caused by accumulated gas inside, Abdul Waheed Kakar, a government official in Loralai, told reporters.
Kakar said the body of one worker was recovered initially, while seven others remained trapped inside.
"Rescue workers entered the coalmine after hours-long struggle, but all seven workers had died by that time because of suffocation," he added.
Lack of proper safety measures and poorly-equipped and trained staff often cause such accidents in Pakistan.
Six workers were killed in a similar accident in northwestern Khyber Pakhtunkhwa province’s Hangu district in December.