Evidence suggests that mining projects include risk and this kind of business is complex and includes unpredictable costs and also in many cases, such as exploration evaluation, uncertainty of the mining engineering and economic uncertainty are affective. In this paper we use two scenarios for economic evaluation of project. First scenario investigates certainty of prices and operating costs and second scenario uncertainty of prices and costs. It is concluded that the mine evaluation suggests greater net present value when uncertainty is considered for both price and operating costs. The purpose of this study is investigated decision making in certain and uncertain situations. For investigate this subject binominal tree by DiverGen software and for calculating of present value of the project Excel software were used .results show that binominal tree is better device for decision making in uncertain situations.
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