Arif Maulana Hadi, Mulya Gusman, Adree Octova, Tri Gamela Saldy, Rayhan Viedtaha
Blasting is the activity of breaking a material (rock) by using explosives to divide the overburden and dismantle solid rock or valuable material or ore deposits that are compacted from the parent rock into material suitable for working in the following production process. The blasting geometry was applied at PT Nusa Halmahera Minerals (PT. NHM) at heading size 5 × 5, which is 0.96 m burden × 1.10 m spacing, for fragmentation data analysis method using Kuz-ram method and image analysis using split desktop software. The top size fragmentation obtained from image analysis is 37.32 cm, and the average fragmentation of the Kuz-ram method calculation is 60.68 cm. These fragmentation results affect the performance of the feeder mill, which can still accommodate rock fragmentation with a size of 70 cm. However, the company plans to reduce the number of blast holes to reduce drilling work time and blasting costs, with the fragmentation size being below the company standard. Therefore, it is necessary to create a new drilling and blasting geometry. From the theoretical calculations, a recommendation for drilling and blasting geometry is obtained with an average burden value of 0.81 m and a spacing of 1.07 m with a total number of blast holes of 39 holes, which results in a top size fragmentation after image analysis of 43.53 cm and an average size of fragmentation Kuz-ram calculation of 56.45 cm. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Departement of Mining Engineering, Universitas Negeri Padang, Padang, 25131, Indonesia
