Rock Products

MAR 2013

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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Page 31 of 99

DRILLING BLASTING Lafarge Saves Big on Blasting CHALLENGE Overcoming fragmentation issues. SOLUTION Implement best practices to reduce direct and indirect costs. TIP Accurate design metrics are very important for successful blasting. Lafarge is implementing a worldwide initia��� tive to optimize drilling and blasting opera��� tions across its 600 sites globally. The initiative aims to reduce costs, increase safety and lessen the impact on the envi��� ronment. The potential savings are esti��� mated at $7.5���$18.7 million annually. Fragmentation has a large impact on quarry performance at every stage of the drilling, loading and blasting process. The initiative therefore plans to increase awareness and understanding of fragmentation and imple��� ment best practices to reduce direct and in��� direct costs. Best practices include the identification of experts, suppliers and equipment to improve the blasting process plus setting up procedures and ensuring competency of operators through training. Principles Successful Blasting New Technologies ofParameters ��� The Blast Design n n measurement, understanding and use of accurate design metrics are very impor��� tant for successful blasting. This should also include consultation with mining plans and a good understanding of the quarry geology. Blast Design Pre���requisites 1. Face preparation ��� Benches must be cleared, scaled of loose rock, and in��� spected for condition before profiling and blasting. 30 ROCKproducts ��� MARCH 2013 2. Surveying ��� Accurate bench profiling and surveying is the first stage in the manufacturing process and is critical to the efficiency of the remaining down��� stream activities. Key to this is the use of correct equipment and trained opera��� tors. Measurement of bench heights, level of crest and toe, slope angle, and maximum and minimum burden can be done using 2D and 3D laser profiling. By mapping a rock face in detail it is possi��� ble to determine actual burdens in front of each planned borehole to avoid exces��� sive burden (vibration, oversize) and in��� sufficient burden (flyrock, airblast). If neglected or if surveying is done incor��� rectly it can have a detrimental effect on the rest of the manufacturing process in��� cluding poor quality drilling and mining operations with increased safety risks and cost. Blast Design Pattern Design ��� Blast hole layout should be designed with respect to the collected sur��� vey data and hence the accuracy and inter��� pretation of this data is paramount. Safety parameters, vibration limits, explo��� sives to be used and design floor elevations must also be considered when designing the pattern. The resulting blast design plan should clearly specify the collar elevations, burden, spacing, drill���hole diameter, type

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