recall reading some posts a while ago about calorific value of...

recall reading some posts a while ago about calorific value of their gas. my experience has been with many companies is look at what they don't tell you - not what they do.
We know their flow rates arent flash ( they have to report that ) but what about their methane content - is it in the high 80's to high 90's. other cbm stocks talk of the permeability measurements of the coal and even the gas content - is calorific value a good reflection of good gas content or is it clouding the issue of a few too many impurities?
I am not wanting to knock the stock as sometimes you get stocks overlooked by the market ( e.g. PES ) but esg has had a fair bit of publicity over recent years,