Turkey's disaster and management agency AFAD in its latest report also said there were at least 1l miners injured.
Rescue workers are trying desperately to reach the scores of trapped miners and have managed to evacuate around 50, a security source told AFP.
The source said there are two air pockets in the mine, one of which was open so rescuers were able to reach the workers, but the second was blocked with workers trapped inside.
Hundreds of people, mostly from the mining company, were gathered around the explosion site as rescuers brought out wounded workers, who were having difficulty breathing and coughing due to the dust.
More From This Section
Fire officials were trying to pump clean air into the mine shaft for those who remain trapped some two kilometres below the surface and four kilometres from the entrance.
The mining company Soma Komur issued a statement calling the mine collapse a "tragic accident".
"Unfortunately, some of our workers have lost their lives in this tragic accident," the statement said.
Turkey's ministry of labour and social security said the mine was last inspected on March 17 and was found to be compliant with safety regulations.
Turkish Prime Minister Recep Tayyip Erdogan expressed his "heartfelt condolences" to the families of those who died.
"Some of the workers have been rescued and I hope we will be able to rescue the others," Erdogan said at an event with journalists in Ankara.
Local media said there were 580 people trapped in the mine at the time of the explosion but many had escaped. Large crowds of tearful and worried family members gathered near the site and the hospital.