There were partial collapses inside the mine, he said, adding that there were no ongoing fires, and that ventilation was working properly.
Turkish President Recep Tayyip Erdogan is expected to visit the site on Saturday.
Amasra’s mayor Recai Cakir said many of those who survived had suffered “serious injuries”.
One worker who managed to escape on his own said: “There was dust and smoke and we don’t know exactly what happened.”
The mine belongs to the state-owned Turkish Hard Coal Enterprises.
Turkey witnessed its deadliest coal mining disaster in 2014, when 301 people died after a blast in the western town of Soma.