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Sublevel Open Stoping originated in the early 1900 s in iron ore mines in Michigan USA It was developed over the years from a method originally known as short hole bench and train a large scale open stoping method it is often referred to as long hole or blast hole stoping A Typical Sublevel Open Stoping Operation
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Most of the stratigraphy in highwall 1 is near horizontal however there is a steep west dipping reverse fault in the middle of the highwall that has drag folding on both sides of the fault Fault displacement is 13 ft 4 m down to the east which is evident on a 2 ft m thick sand horizon
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Develop remote semi automated or automated mining systems draglines excavators dozers and explosives trucks Establish selective mining techniques thin seam mining steep dip [20 90°] highwall/floor mining remote access of deep seams from
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An unvegetated evenly excavated open cut highwall creates a perfect configuration to study the effect of longwall subsidence on a steeply dipping surface Background Inclinometer monitoring adjacent to the Broadmeadow Mine LW11 panel during the start of the block confirmed that the direction of shear movement is toward the centre of the void created by the longwall panel
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ICG ADDCAR Systems LLC ADDCAR completed the manufacturing and loading onto a boat the first ever highwall mining system to be delivered to India The system was purchased by Advanced Mining Technologies Pvt Ltd AMT who will serve as a contract miner for Singareni Collieries located near Hyderabad India This system incorporates all of our latest technologies relative to steep dip
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Mining method description Example mines Multiple seam steep dip truck and loader strike cut haulback mine with truck and loader coal mining Mt Owen NSW Leigh Creek South Australia Duralie NSW Ravensworth East NSW Several seam moderate dip dragline down dip strip mine with throw blast dozer assist and truck and loader prestrip
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Compare steep dipping reef s support costs at Mine A with flat dipping reef s support costs at Mine B Scope of the study All the objectives were covered except that for mine planning and efficiencies The available information was not sufficient for a detailed analysis to be made
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mining mining Blasthole stoping When the dip of a deposit is steep greater than about 55° ore and waste strong ore boundaries regular and the deposit relatively thick a system called blasthole stoping is used A drift is driven along the bottom of the ore body and this is eventually enlarged into the shape of a trough At the end of the trough a raise is driven to the drilling
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Highwall mining is used to mine coal from underneath the inal highwall when the strip limit is reached due to economic reasons or surface conditions • Contour mining In a mountainous area the highwall mining system can follow a coal seam along the side of the hill • Trench mining The unit mines coal from both sides of a purpose prepared trench this mining method is used when an
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Highwall mining can produce thousands of tons of coal in contour strip operations with narrow benches previously mined areas trench mine applications and steep dip seams with controlled water inflow pump system and/or a gas inert venting system Mineral Processing
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Using an effective dip mining method with basic highwall mining system is an alternative for steep coal seams as shown in Considering Indonesian coal seam conditions only the auger mining system has been tried at a few open cut coal mines as shown in Fig 6
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· This is a short video to build the wireframe in MineScape in a steep dip coal seam
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· When there is a steep highwall 70 90° and a flatter seam like in the case of a few Highwall Mining sites in the US the web pillar may experience more or less uniform vertical stress In the Indian Highwall Mining scenarios discussed here the final highwall has a slope in the range of 45 50° and the coal seams are dipping at angles of −5 to 20° in the direction they are to be
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Transcurrent strike dip faults unless major do not lead to slope instability Open pit designs should attempt to avoid the presence of adversely oriented structurally controlled discontinuities in the highwall Gregg River Mine 4 in Alberta Canada had two highwall slopes 160 and m 525 and 720 ft high excavated in a dipping strata in approximately the same lithologic and
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Highwall mining HWM is a hybrid mining arrangement whereby underground mining methods are used in a surface environment using a combination of underground surface and specialised equipment Many in the Australian industry have broad views as to what constitutes HWM and relate past experiences and apply particular biases to strategic planning decisions that in some cases are
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Abstract A highwall failure at an open pit coal mine in western Alberta Canada occurred on 9 July 2017 A larger failure occurred on 5 August 2017 Radar monitoring successfully identified this second failure prior to the event The initial assessment of the failure mechanism suggested toppling of steep
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· This is a short video to build the wireframe in MineScape in a steep dip coal seam
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Most of the stratigraphy in highwall 1 is near horizontal however there is a steep west dipping reverse fault in the middle of the highwall that has drag folding on both sides of the fault Fault displacement is 13 ft 4 m down to the east which is evident on a 2 ft m thick sand horizon Near vertical fractures exist adjacent to the uppermost portion of the fault On the west
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Compare steep dipping reef s support costs at Mine A with flat dipping reef s support costs at Mine B Scope of the study All the objectives were covered except that for mine planning and efficiencies The available information was not sufficient for a detailed analysis to be made
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· Highwall mining is a technique to obtain additional coal recovery after the economic strip limit is reached in surface mining It involves the remote deployment of a continuous miner in openings beneath the final highwall with no personnel entry Many candidate areas for highwall mining have thick and steeply dipping seams
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