TY - JOUR ID - 1831 TI - A New Technical and Economic Model to Calculate Specific Charge and Specific Drilling Using Hole Diameter, Bench Height, Uniaxial Compressive Strength, and Joint Set Orientation JO - Journal of Mining and Environment JA - JME LA - en SN - 2251-8592 AU - Ghanizadeh Zarghami, A. AU - Shahriar, K. AU - Goshtasbi, K. AU - Akbari Dehkharghani, A. AD - Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran AD - Department of Mining and Metallurgy Engineering, Amir Kabir University, Tehran, Iran. AD - Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran AD - Department of Petroleum, Mining and Material Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran Y1 - 2020 PY - 2020 VL - 11 IS - 4 SP - 991 EP - 1005 KW - Specific Charge and specific Drilling KW - Hole diameter KW - Height bench KW - Uniaxial compressive strength KW - Joint set orientation DO - 10.22044/jme.2020.9527.1864 N2 - Calculation of the specific charge and specific drilling before a blasting operation plays a significant role in the design of a blasting pattern and the reduction of the final extraction cost of minerals. In this work, the information from the Sungun, Miduk and Chah-Firouzeh copper mines in Iran was assessed, and it was found that there was a significant relationship between the specific charge and specific drilling and the hole diameter, bench height, uniaxial compressive strength and joint set orientation. After finding a technical and economic model to calculate the specific charge and specific drilling, this model was tested on the Sungun copper mine. Due to the insufficient consideration during the design of a blast pattern and because of the high hardness of the rocks in some parts of the mine, lots of destructive events such as boulders, back break, bench toe, high specific charge and high specific drilling, fly rock, and ground vibration in the blast operations were observed. The specific charge and specific drilling were found to be the most important technical and economic parameters involved in designing a blasting pattern, and they were found to play an important role in reducing the blasting cost. The blasting cost could be largely controlled by the accurate examination and computation of these parameters. An increase in the rock strength and the angle between the bench face and the main joint set would increase the specific charge and specific drilling. On the other hand, a specific charge and a specific drilling would decrease when the hole diameter increased in every range of the uniaxial compressive strength. UR - https://jme.shahroodut.ac.ir/article_1831.html L1 - https://jme.shahroodut.ac.ir/article_1831_d0075c951dc9bf1bc51aed353d049dee.pdf ER -