Abstract. The Cao Son mine is located in the southern part of the Quang Ninh province. It belongs to the Hon Gai coal zone, where many coal resources have been estimated in Vietnam. Based on synthesizing and processing data of the mining geological parameters by using stable random function and statistical methods, results show that the coal reserve reliability depends on some elements such as geological conditions, system and the grid exploration density, and methods of interpolated geological documents, and estimating of mineral resources methods. The stable random function for calculating the affected range indicates that most of the exploration works satisfy the appropriate pattern grid exploration for reserve level 122 in the Cao Sơn mine. The statistic models based on the confidence probability of 0.90 are applied in this paper to estimate coal reserve reliability in the study area, resulting in ± 15.36 ÷ ± 17.36% of coal reserve errors. It indicates that calculating coal resources during the exploration process is good enough for the exploited design. Results also provide an overview of the affected elements of coal resource reliability, serving as a basis for determining the errors of coal resources in the Cao Son mine. These can be applied to other deposits occurring in similar geological settings.
Keywords: coal reserves, geomathermatic models, Cao Son mine, Quang Ninh province
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