Abstract
In the previous report, the authors analysed economically mineable coal resource by way of scrutinizing production and railway transportation cost with respect to horizontal and vertical annual progress, and annual removal of coal mining front line in NSW State, Australia, and concluded that the front line removal of coal mining could be extinct only in 13 years or one twenty fifth of duration in terms of demonstrated coal resources released by the State Government.
The authors therefore studied subsequently the pragmatic economic evaluation method envisaging that numerous numbers of studies covering World's potential coal fields are essential to detect actually available coal tonnages produced and supplied to the coal consuming countries particularly to Japan.
Basic analysis has been carried out in this report to compare established but complicated methodology (IRR) with newly developing conventional but ambiguous in its theoretical back ground (SC).
As the results of theoretical comparison of these methods, it was found that the SC method is suitable to study the economic potential of the World's major coal fields because
i) In principle, theoretical back ground of SC is the same as established IRR method.
ii) Data can be utilized, for the SC calculation is comparably easy to collect from the coal fields.
