A file picture of rescue operations after a mine blast in Shizong county, Yunan province , last year. A gas explosion in a southwest China coal mine on Friday has killed 13 workers and injured six ... more 

A file picture of rescue operations after a mine blast in Shizong county, Yunan province , last year. A gas explosion in a southwest China coal mine on Friday has killed 13 workers and injured six others, according to the latest count less