Drop Raising in Mining (VCR) Method. Under ground mechanized mining methods. Drop Raising in Mining (VCR) Methods of Stopes ( Extraction of Ore). Hindustan Copper Limited has addressed the complex ‘raising’ operation in mining and developed and implemented Drop Raising techniques at 80 meters intervals which improved safety and led to faster and higher productivity. A pattern of five (165mm) blast holes have been standardized for blasting the raises sequentially by the carater method.
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