News that all 28 miners trapped by a fire inside a a Waihi Gold underground mine have been successfully rescued is a "huge relief" for their families, says Hauraki District Mayor John Tregidga. He said he was "absolutely delighted'' that the miners have been evacuated safely but there are still questions about what caused the emergency. An investigation has been launched into the fire inside the mine after rescuers successfully evacuated all 28 trapped miners. A truck engine caught fire in Newmont Waihi Gold's Trio underground mine at about 5am, leaving the men trapped in three refuge chambers.