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Conference Proceedings

The Australian Mine Ventilation Conference 2019

Conference Proceedings

The Australian Mine Ventilation Conference 2019

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Ventilation of waste and orepasses, tramming routes and drawpoints

Many modern metalliferous mines continue to use ore and waste passes to transfer broken material vertically through the operation. Handling broken material produces dust and any open vertical connections between levels provide opportunities for short-circuiting, unwanted low flows (dead spots), flow reversals and recirculation. As loaders and trucks have become more productive by using larger buckets and trays and can handle a larger size fraction, their loading and dumping rate is much faster, so orepasses have also become physically larger in diameter. Loaders are also now frequently used in teleremote and even autonomous operation. Reducing mine capital costs has meant vertical development for exhaust raises or other connections to ventilate orepasses has often been removed from mine designs. Ventilation controls for large headings and passes are very expensive and more easily damaged by heavy equipment impact and blast overpressures than previous smaller controls. In some cases, finger raises into the pass system have also been removed. The number of passes used for a given production rate has been reduced either because loader productivity is much higher than in the past, or to lower capital costs, and this has resulted in even more pressure to use multi-level tipping into one pass from separate levels to increase pass utilisation and productivity. At the bottom of passes, traditional rail haulage has been replaced by loader or truck haulage, and chutes at the bottom of passes have been removed due to cost and delays to commencement of production from that pass. All of these changes have resulted in much greater difficulty in providing satisfactory ventilation outcomes for mines using ore or waste passes. This paper discusses the impact of these changes on available controls for orepass ventilation and tramming routes, as well as crusher and conveyor ventilation, and offers some additional solutions for these systems. CITATION:Brake, D J, 2019. Ventilation of waste and orepasses, tramming routes and drawpoints, in Proceedings Australian Mine Ventilation Conference 2019, pp 342354 (The Australasian Institute of Mining and Metallurgy: Melbourne).
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  • Published: 2019
  • PDF Size: 1.51 Mb.
  • Unique ID: p201904031

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