Michael founded Longwall with David and Matthew. They raised their first fund, OTECF, in 2008. With a D.Phil in Mathematics from the University of Oxford, Michael had a 16 year career with Morgan Stanley as an investment banker and went on to be a successful angel investor investing in early stage technology businesses.
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Oct 19, 2018 · Underground mining using the room and pillar method leaves pillars to support the overlying strata. When longwall mining is used to extract a lower coal seam beneath the room and pillar mine, the bending of the interburden strata can induce pillar failure and roof caving. In this study, two physical model experiments with different pillar …
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Dec 1, 2018 · The longwall face had an average face airflow of 5.8 m 3 /s (12.2 kcfm) at a face velocity of 1.5 m/s (300 fpm); the scrubber capacity was 2.4 m 3 /s (5.0 kcfm). Test results indicated a 50% dust reduction at a point more than halfway along the face, and a maximum 66% dust reduction in the return (Wirch and Jankowski, 1991). However, a …
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Sep 29, 2023 · Most longwall operators want to go the extra mile to make sure that machine will operate reliably throughout the next panel.” Longwall panels have grown consistently in length and width over the last 10 years. Longer panels allow longwall operators to mine more coal between moves, which places a greater demand for extended shearer …
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These smart mining tools enable you to remotely manage your longwall from a secure location, underground or on the surface. A comprehensive suite of automation technologies and solutions is available across our entire longwall product line — shearers, AFC and Joy-designed powered roof supports (PRS).
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Feb 1, 2020 · The broken positions of the overlying strata might lead to different geometric configurations of the caving overburden and also have an impact on the coal mine pressure behaviors and dynamic mine hazards in the open face area. This paper has developed a roof failure analytical model combining the beam on the elastic foundation theory and …
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Aug 15, 2022 · The significant increase in longwall advance speed will cause the residual coal to enter the mining void faster, thus inhibiting the rapid increase of the coal temperature. Therefore, increasing the longwall advance rate can significantly reduce the risk of spontaneous combustion in the gobs. Download: Download high-res image (526KB)
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Jun 14, 2024 · Gas concentration is a pivotal parameter in assessing excavation safety within coal mines, almost all mining operations are associated with gas concentration, and it is also the primary factor to ...
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Dec 1, 2019 · The study site is located at the Pingshu coal mine operating in the Yangquan coal field, China. A plan view of the longwall panel, showing the layout of the panel and entries, as well as the locations of monitoring stations is presented in Fig. 1.The coal seam had an average thickness of 2.3 m and a depth between 368 and 502 m, was sub …
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