other coal companies

was just wandering why mnm with the 500mt coal resource (still very early days) is so cheap compared to some coal companies that have less resource example a coal company which has 3 mines producing about 3.6 mt at moment and targeting 15mt by 2010 sp is $16.00 and are at a superior advanced stage with the coal than mnm. and mnm have other opportunities as well just wanted to get some thoughts about it from investors on hc who know what their talking about ,unlike myself and hopefully someone could help my little mind cheers to all