Eight miners were killed and one seriously injured in separate colliery accidents this week in southwest China's Yunnan Province, media reports said Sunday. A gas blast occurred in a coal mine in Chuxiong city Wednesday, leaving five dead and one seriously injured. Gas leaked on the same day in the Chinahe coal mine in Xuanwei city in eastern Yunnan, killing one miner. Another miner was killed Tuesday when a shaft collapsed in the Xuekong colliery in the Dali Bai Autonomous Prefecture. A colliery worker died of the same reason in the Dachonggou coal mine of Shizong County Monday.