Carbon monoxide poisoning killed 23 miners who became trapped in a coal mine in southwest China on Friday.One survivor was rescued from the Diaoshuidong mine in Yongchuan district in Chongqing.Chinese media reported that the mine had been due to close two months ago after its permit expired and the owner had been selling equipment as scrap metal.The 24 miners who were trapped had been sent down to help dismantle the equipment, Southern People Weekly reported, two weeks after a group of miners…