As an economical evaluation is proceeded for the mine construction, not only must the income of the individual enterprise be payed to attention, but also the social benefit must be judged. Thus, the mine construction project need a comprehensive assessment. It is impossible for a reasonable investment decision to be made by emphasizing either the micro-economical effec-tiv ness or macro-one unilaterally. Evaluating from the angle of the national economics is able to guide the industry enterprises to notice not only the immediate or loacal profits but also the distant or national ones. Minding the macroeconomic effects is possiblly to let the microeconomics controled, guided and developed schedully.
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