Fidosnos, you might have difficulty buying out the company as management own over half. But a feature of the underground coal miners is (a) they have all been listed in the past 6 years (b) they have growing earnings, even WDS (c) they have relatively low market caps, although DSB is the smallest (d) they all sell on low PE's.
Still, with a ROE of more than 25% for DSB and MYE, they have to make sense on a long term basis.