The Design of the Large Blastholes Pattern by Analyzing of Fragmentation of Blasted Rocks in Sarcheshmeh Copper Mine
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- 作者：Mehdi Hosseini ; Zahra Naderi Namvar
- 关键词：Blasting pattern ; Fragmentation ; Sarcheshmeh Copper Mine
- 刊名：Geotechnical and Geological Engineering
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：35
- 期：1
- 页码：395-402
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Terrestrial Pollution; Waste Management/Waste Technology; Civil Engineering;
- 出版者：Springer International Publishing
- ISSN：1573-1529
- 卷排序：35
文摘
Drilling and blasting are the main excavation operations in open pit mines. Proper fragmentation of blasted rocks is one of the main features of a successful drilling and blasting operation. In this study, 12 explosive events in the phyllic and potassic zone of Sarcheshmeh Copper Mine were analyzed. The common image analysis was used to investigate fragmentation of blasted rocks. The aim of the present study was to provide a blasting pattern for large holes (10.5″) and to study rock fragmentation by this blasting pattern. In addition to reduced excavation costs, the use of large blastholes will increase the production rate. GoldSize software was used to analyze rock fragmentation. The software was calibrated using the results of screen analysis on two samples taken from potassic and phyllic zones. According to size distribution curves of fragmented rocks, over 97% of rocks obtained from the 6, 8, 9 and 9 7/8″ blastholes were smaller than 20.32 cm. As a result, they passed through the crusher outlet. The burden value for the sulfur and waste regions was 8 and 7 m, respectively. A hole spacing of 10 and 9.5 m between the holes was proposed for the sulfur and waste regions, respectively. The size distribution curves of the rocks fragmented by large blastholes were obtained by image analysis. The results showed that the size distribution curve of the large blastholes was fitted to that obtained for the 9 7/8″ blasthole.