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The meeting was called at the request of Inspector Marlborough to discuss the recent 27 exceedances of 2.5% methane in the LW102 TG. Reconsidering if the bleeder could be made a return. Inspector Marlborough requested a copy of the Ventsim model which was the basis for the Mine decision to discount this option

  • July 19, 2021

A further 22 Methane HPI's occur between the 18th of January and the 19th of March 2018. On Monday 19 March 2018, Inspectors Marlborough, Brown and Gouldstone held a meeting…

Following exerted pressure from the Department and greater recognition by Mines of the hazard of elevated methane levels, substantially more effort and investment had been made into methane drainage capacity and efficiency. This was clearly increasing the amount of gas drained, decreasing operational downtime by early intervention to avoid exceedances rather than cutting to trigger trip events. Most importantly risk was being reduced.

  • July 18, 2021

Between the 6th and 8th of January there were Five (5) methane HPI’s in the Tailgate of LW 102. The first when the Longwall had retreated 29m and the last…

The risk assessment does not mention the risk of an ignition of Methane as a potential hazard. This has to be a major hazard when considering Methane levels of in the TG, as the primary source of the methane is the Longwall goaf gas, which inevitably will flow in the vicinity of the chain pillar rib line. Les Marlborough Mines Inspector 13th October 2017

  • July 14, 2021

Inspector Marlborough next MRE about the Grosvenor Procedures for  GRO-750-TARP-General Body Contaminant is dated the 13th of October 2017 I found this sentence of the MRE about how the Grosvenor…

“The Level 2 and 3 triggers for Methane for the Longwall return that require the Shearer speed to be reduced by 30% or to stop the shearer do not occur when the shearer is in the TG Shuffle Zone; Has the Methane ignition risk been assessed for this in the risk assessment when developing this TARP?” Les Marlborough Inspector of Mines 12th September

  • July 14, 2021

Now Mines Inspector issues a written Section 168 Directive to Grosvenor Mine SSE on the 12th of September 2017. The mine is to review the GRO-750-TARP-General Body Contaminant and the…