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On the basis of many years’ experience with writing and reviewing expert reports on resources and reserves of\udindustrial and construction minerals, the author points out some mistakes which have been made by the authors\udof those reports while they were calculating reserves and resources of some of those minerals. Consequently, the\udreported resources and reserves of some exploration and exploitation areas were not realistic. The miscalculations\udwere due to neglect of some correction coefficients, especially where cross-sections in which the calculations of\udresources and reserves were made were not perpendicular to beds, seams or batters in open-pits. As a result, the\udresources and reserves were rather exaggerated, which was misleading for the authors themselves, as well as for the\udinvestors. Personal responsibility in these cases is on the side of the authors of the expert reports, while objective\udresponsibility lies with their employing companies and institutes, respectively. This article is aimed to promote\udthe awareness of possible calculation mistakes in order to improve the quality of expert reports on resources and\udreserves of industrial and construction minerals in the future in such a way that they will be more realistically and\udresponsibly elaborated, regardless of different authors, reviewers and producers of those reports

The importance of using correction coefficients and some mistakes appearing in writing expert reports on industrial and construction minerals