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Field Evaluation of Air-Deck Blasting for Improving Rock Fragmentation at the Gol-e-Gohar No. 1 Open-Pit Iron Ore Mine, Iran | ||
| Journal of Geomine | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 03 مرداد 1405 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22077/jgm.2026.11319.1078 | ||
| نویسندگان | ||
| abbas khajouei Sirjani* 1؛ Farhang Sereshki2؛ Mohammad Ataei2؛ Mohammad Amiri hosseini3 | ||
| 1Faculty of Mining, Petroleum & Geophysics Eng., Shahrood University of Technology, Shahrood, Iran | ||
| 2Faculty of Mining, Petroleum & Geophysics Eng,, Shahrood University of Technology, Shahrood, Iran | ||
| 3Researcher, The Department of Mining and Geology of Research and Technology Management of Gol-e-Gohar, Sirjan, Iran | ||
| چکیده | ||
| Rock fragmentation plays a critical role in the efficiency of downstream mining operations and in the overall economics of open-pit production. This study investigates the performance of air-deck blasting under full-scale production conditions at the Gol-e-Gohar No. 1 open-pit iron ore mine, Iran, and compares its results with those of conventional fully coupled blasting. Over a two-month period, 14 production blasts were analyzed, including 7 conventional blasts and 7 air-deck blasts selected under comparable geological and operational conditions. Fragmentation was evaluated using a consistent image-based analysis procedure, and key particle-size distribution indices, namely D20, D50, and D80, were obtained from cumulative size distribution curves. In addition to fragmentation characteristics, operational performance was assessed through specific charge, specific drilling, blast-hole productivity, oversize fraction, muckpile condition, and shovel loading behavior. The results showed that air-deck blasting generated finer and more uniform fragmentation than the conventional method, with D20, D50, and D80 reduced by approximately 30.0%, 18.6%, and 20.7%, respectively. The improved fragmentation also enhanced digging and loading conditions, leading to an approximately 10% reduction in shovel loading time and a 9% increase in blast-hole productivity. Statistical evaluation confirmed that the differences between the two blasting approaches were significant for the tested field dataset, while Split-Desktop-based statistical validation produced coefficients of determination (R²) in the range of 0.71-0.73 and RMSE values between 8.9% and 10.1%. Although the findings are site-specific and should be verified under different rock-mass and operational conditions, they demonstrate that air-deck blasting is an effective and practical technique for improving fragmentation quality and operational efficiency in open-pit mining operations. | ||
| کلیدواژهها | ||
| Air-deck blasting؛ Rock fragmentation؛ Open-pit mining؛ Image-based fragmentation analysis؛ Blast design optimization؛ Gol-e-Gohar iron ore mine | ||
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