SHANGHAI Sun Jan 26, 2014 A policy setting new minimum heating values for lignite, currently at the draft stage, would benefit Australian miners who produce low-ash coal of high calorific value, and threaten the export prospects of Indonesia's low-ranked coal miners....Enquiries for Indonesian coal with heating value of around 3,800 kcal/kg (NAR), previously popular with Chinese buyers, have already dried up, traders said, adding that buyers are now switching to coal with at least 4,700 kcal/kg (NAR).