Abstract:

The structure of coal seams in Vietnam is quite complex with tectonic disturbances and inseam rockpartings. Determining the geological structure, calculating reserves and especially the geological reservesof coal seams is a common but rather difficult task for mining engineers. The traditional method in Vietnamis linear interpolation and calculating reserves by parallel cross-sections. But now, with the support ofcomputers, the modeling method is being widely applied, and moreover, it also helps to accuratelydescribe the structure of the coal seam and eliminate the rockpartings located between the roofs andfloors in the seams, which is very necessary for calculating coal reserves. At the same time, new criteriafor coal reserves have also been introduced, such asT, T1, T2. This newly applied method of calculatingcoal reserves not only increases the accuracy, but also shortens the time and even increases thecalculated coal volume compared to the traditional method, has many scientific and practical meanings,and can be effectively applied to geological and surveying works such as calculating geological reservesand calculating mining excavated volume. The main content of the paper is to introduce the method of calculating reserves by combiningstructural modeling and thickness of coal seam. This method is applied to calculate all major coal seamsin large open-pit minesof Vinacomin, butthe typical case study presented in the paper is the case ofCaoSon andHa Tumines,using data from boreholes in Vinacomin's geological exploratory reports. In order to have good results of reserve estimation, the article also introduces the creation of relationalgeological databases of coal deposits for mines. The modeling results demonstrate the effectiveness ofthese PC appliedworks, including establishment of coal seam structural maps such as elevation isolinesof roof, floor and thickness of coal seams, as wel as tectonic zone planes. Thesemodeling results can beserved as the basis for mine design, mine planning, mine scheduling, mine optimization andeconomicefficiency calculation... on computers in a continuous and intergrated way.