Multiple raise round blasting technique
- Universal Blasting, Black Creek, British Columbia (Canada)
The Multiple Raise Round Blasting Technique (MRRBT) is a safe, efficient, cost effective method of blasting that will use existing mine personnel. The MRRBT, developed from the conventional drop raise method style of blasting, can be used for most raise mining applications. Current results using MRRBT indicate no upper limit for the maximum length that a raise can be blasted. To date, only small diameter holes have been used with MRRBT; undoubtedly larger diameter holes will be used with this procedure in the future. The drill pattern and hole size are typically determined by local conditions. The cost per foot/meter should be substantially lower using MRRBT, as opposed to raise bore machines and/or conventional raise miners. Drilling, loading and blasting multiple rounds in one operation is possible with MRRBT, which makes it a cost effective method of mining. MRRBT blasts, in sequence, each round before the next round starts, until the entire length of the drilled raise is blasted. Rounds are loaded individually, including the non-explosive decking and a delay system in between rounds. The process of sequentially blasting the complete raise at one time provides a significant safety benefit, as the miner does not have to re-enter the raise. Where conventional raise mining techniques are employed there is a safety risk to the worker; MRRBT is a considerably safer and more efficient process than current conventional raise mining methods.
- OSTI ID:
- 433675
- Report Number(s):
- CONF-940144--
- Country of Publication:
- United States
- Language:
- English
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