The roof of an illegal gold mine in Ghana collapsed killing at least 18 people, including 14 women, in one of the worst mining disasters to hit the African nation, police said on Thursday. Thirty miners were believed to be inside the mine in Dompoase, about 400 kilometres (250 miles) west of Accra, said police commander Kojo Antwi Tabi. Tabi said more bodies could be recovered from the privately-run mine. Ghana is the second largest gold producer in Africa. Revenues from gold, which accounts for more than 90 percent of the country's mineral exports, stood at 2.2 billion dollars last year, according to the Chamber of Mines.