Evaluation of Coal Reserve Reliability in the Nui Beo Mine, Quang Ninh Province Based on the Statistical and Stable Random Function Methods

The Nui Beo is a famous coal mine in the Hon Gai coal zone, Quang Ninh province, where contains many coal resources in Vietnam. In this study, synthesizing and processing data of the mining geological parameters by using the stable random function and statistical methods are used to evaluate the coal reserve reliability in the Nui Beo mine. The results show that the coal reserve reliability depends on geological conditions, especially in the distances between exploration works and parameters of calculating coal reserves (i.e., thickness, density, and declination angle on coal seams). Most exploration efforts in the Nui Beo mine satisfy the suitable pattern exploration grid for reserve level 122, according to the stable random function used to calculate the affected range. Statistical models based on a confidence probability of 0.95 are used to evaluate coal reserve dependability in the research region, resulting in ± 10.12 ÷  ± 16.46% of coal reserve errors. Estimating coal resources during the exploratory process is sufficient for the exploitation design. The findings also give an overview of the parts of coal resource dependability that have been impacted and a foundation for assessing the coal resource error in the Nui Beo mine. These can be used on other coal resources with general comparable geological and mining conditions.