A Novel Mitigation Approach for Lightning Threat in Underground Mines with Gas Drainage

Effective mitigation of direct and indirect lightning discharges is an important aspect of the reliable operation of any mining operation. Whilst a systematic protection plan can be implemented relatively easily for above-ground operations, the circumstances are rather more complex for underground mines. In addition, underground coal mines present even greater challenges due to the risk of methane ignition. This paper outlines the main variables and transfer mechanisms of relevance to underground mines and then provides some examples of calculations carried out to quantify the dangers that lightning may pose in underground coal mines. The main factors that elevate the risk of lightning in underground coal mining operations are identified, options for mitigation are outlined and one practical mitigation strategy that may be implemented for gas drainage operations is described and verified.