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24 Jun 2016
POSTED BY - MineExcellence
1. INTRODUCTION
A number of new technology applicable for drill and blast operations are now available to improve productivity and profitability of mining operations, optimise ore extraction and extend the life of mine. Blasting is an operation which affects all subsequent operations and costs. All of the activities – blast location, pattern design, selection of charge type, charge amount and distribution, mark up to drill, charge and stem, decide on initiation and tie-up and safety precautions and blast -- are linked in a sequence because they must be carried out in a certain order. While carrying out blasting process there is no measurement and control at different stages. Compliance audit of execution is often absent as only some steps are checked. However, by using new technology, in an integrated manner the drill and blasting team can alter the blast charging, initiation sequence and tie-up just before the blast in the field to improve results.
There is often difference in designed and actual drilled holes. Actual drill data can be used for predicting impact of blasting and if the environmental limits for vibration and flyrock imposed by regulatory authorities or fixed by management exceed then explosive charge distribution and initiation timing and sequence can be changed so that limits are not exceeded.
23 Jun 2016
POSTED BY - MineExcellence
ABSTRACT: Data collection: pre-blast, during the blast and post-blast is critical to the blasting process, for planning purposes, statutory requirements and/or environmental compliance. The review and analysis of past data can improve blast design, execution and help in the achievement of desired blasting outcomes, down-stream productivity and process improvement. Based on the database and its search and analysis capabilities, the system can provide opportunities for taking corrective steps by changing charge distribution, initiation timing and sequence for controlling fragmentation size, flyrock, and ground and air vibrations.
This paper shows importance of data collection and analysis. A case study has been provided where data from 1995 till date has helped a limestone open pit mine in improving drill factor from 45 tons/m to 75 tons/m, breakage of limestone from 6.5 tons/kg to 14 tons/kg thus reducing costs by 50% while improving crusher productivity from 764 tons/hour to 932 tons/hour and controlling vibration, flyrock and dust.
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