Explosive Charge Distribution: A Parameter for evaluating the Blasting Results in Rosia Poieni Open Pit Mining

One of the simplest and most popular open pit mining procedures is drilling-blasting technology. This enables the extraction of a significant amount of rock and valuable mineral material. Open pit mining relies heavily on the action of blasting employing explosive energy, which is also the essential step in the blasting process that yields a matching granulometry. In the sense that each operation determines a certain outcome that will be a crucial component for the subsequent operation that takes place in the working face, this operation is a part of a series of interdependent operations. As a result, the explosive blasting operation shouldn't be viewed as a separate act. The entire manufacturing technology process, including blasting, needs to be viewed from a global perspective. The basic approach taken in this optimization study entails analyzing the blasting operations carried out at drilling diameters of 250 mm (the blasting technology used in Rosia Poieni open pit mining), as well as simulating the excavation of the same rock volume while optimizing the explosive charge distribution at drilling diameters of 200 mm and 150 mm. Based on observations made in the quarry, it was discovered that the length of the tamping in the mineralized rock, which results in the appearance of blocks with dimensions that are greater than those permitted in the crusher tank (1.2-1.3 m), is what causes the majority of problems in the case of holes with a diameter of 250 mm. That is why the technique that successfully reduces their number-discontinuous loads with intermediate tamping-is adopted. It is required to employ smaller drilling diameters, but with productivity levels high enough to guarantee the proper development of the extraction process, in order to get a granulometry matching the main crushing operation, which will enable to reduce crushing costs. According to the results of the study, it is advised to apply a discontinuous load in order to preserve the whole length of the explosive charge. It is advised to use an appropriate drilling diameter (150-200 mm) and intermediate tamping at 2-3 m length to limit the upper stemming area to a maximum of 7 m (to reduce or completely eradicate the occurrence of oversized blocks) in areas where the rocks have a Protodiakonov coefficient f > 6.5. The research findings will improve the operation's geometry and safety aspects, limiting the explosive effect on the massif and the environment and lowering the overall cutting operation expenses. By employing less explosive gels (12-18 kg/hole) in a dry environment and completing the difference in explosive charge length with AM-1, the cost of explosives and starting materials can be decreased.

One of the simplest and most popular open pit mining procedures is drilling-blasting technology. This enables the extraction of a significant amount of rock and valuable mineral material. Open pit mining relies heavily on the action of blasting employing explosive energy, which is also the essential step in the blasting process that yields a matching granulometry. In the sense that each operation determines a certain outcome that will be a crucial component for the subsequent operation that takes place in the working face, this operation is a part of a series of interdependent operations. As a result, the explosive blasting operation shouldn't be viewed as a separate act. The entire manufacturing technology process, including blasting, needs to be viewed from a global perspective. The basic approach taken in this optimization study entails analyzing the blasting operations carried out at drilling diameters of 250 mm (the blasting technology used in Rosia Poieni open pit mining), as well as simulating the excavation of the same rock volume while optimizing the explosive charge distribution at drilling diameters of 200 mm and 150 mm. Based on observations made in the quarry, it was discovered that the length of the tamping in the mineralized rock, which results in the appearance of blocks with dimensions that are greater than those permitted in the crusher tank (1.2-1.3 m), is what causes the majority of problems in the case of holes with a diameter of 250 mm. That is why the technique that successfully reduces their number-discontinuous loads with intermediate tamping-is adopted. It is required to employ smaller drilling diameters, but with productivity levels high enough to guarantee the proper development of the extraction process, in order to get a granulometry matching the main crushing operation, which will enable to reduce crushing costs. According to the results of the study, it is advised to apply a discontinuous load in order to preserve the whole length of the explosive charge. It is advised to use an appropriate drilling diameter (150-200 mm) and intermediate tamping at 2-3 m length to limit the upper stemming area to a maximum of 7 m (to reduce or completely eradicate the occurrence of oversized blocks) in areas where the rocks have a Protodiakonov coefficient f > 6.5. The research findings will improve the operation's geometry and safety aspects, limiting the explosive effect on the massif and the environment and lowering the overall cutting operation expenses. By employing less explosive gels (12-18 kg/hole) in a dry environment and completing the difference in explosive charge length with AM-1, the cost of explosives and starting materials can be decreased.