In this paper there is characterized the influence of closeness of mineral quality estimation over the risk of suffering a financial loss. This loss is caused by the decision based on the quality evaluation of a mineral lot according to the received determination results. There is payed attention to the importance of likelohood that the real quality parameters of mineral lot are finded aut the utmost of the permissible tolerance for determination results. This likelihood is a essential factor for the sayed risk and is directly formed by the probability that the real quality parameters are found inside the spaces corresponding to the established estimation tolerances. The forming probability is called the confidence level and in common with these spaces termed the confidence intervals, are the criterion for assessment of statistical closeness pertaining to the mineral lot multidimensional quality. This closeness is consequent upon the estimation method used. The traditional method is not agreed with the principles of the representativeness method. The practiced estimation is onedimensional while majority of mineral qualities are multidomensional and/or multivectioral. There is broached the uncertainly arrising at when the traditional method is applied to determinate a multidimensional and/or multivectorial mineral quality. In the case of arriving at the decision concerns a mineral quality class on the basis of the results represented the mineral quality obtained by the traditional method, it has proved that the uncertaintly very increases. The decision risk follows this method is adequately increased. The risk of decision based on the quality evaluation, can be decreased to the desirable level on condition of using the fit variant of the multidimensional-multivectorial method for mineral quality setimation. Then the decisions assign the mineral qualities pointed aut by determination results, as real, will be correct.