One of the most important goals of a regional exploration operation is to calculate the deposit reserve. Moreover, conclusion can be made only after this stage, in which we investigate whether economic extraction is feasible. One of the issues to be considered when calculating the reserve is that since the mineral deposit reserves have been determined with regard to limited information, the estimation and evaluation of the reserves may be followed by errors. Of course, the value of different reserves will vary depending on the amount and precision of the available information. In fact, the real reserve of the minerals can be identified only when the last mineral particles have been extracted. In different stages of the exploration of a deposit, its reserve will be calculated. Therefore, it is clear that as the different stages of exploration are completed, the amount of the calculated and declared reserves will also change and be more accurate.