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Development of a Six Drilhead Roof Bolting Machine
By Bill A. Kyslinger
"In underground mining, machine design is predominantly dictated by mine conditions and individual customer desires. In partnership with Foresight Energy, J. H. Fletcher & Company was tasked to design
Jan 1, 2016
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Analysis of Coal Pillar Stability (ACPS): A New Generation of Pillar Design Software
By Zach Agioutantis, Christopher Mark
"Thirty years ago, the Analysis of Longwall Pillar Stability (ALPS) inaugurated a new era in coal pillar design. ALPS was the first empirical pillar design technique to consider the abutment loads tha
Jan 1, 2018
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Measurements of Horizontal Shear Movements Ahead of Longwall Mining and Implications for Overburden Behaviour
By Jesse Puller, Ken W. Mills, Owen Salisbury
"An underground coal mine located in New South Wales has a target coal seam located 160-180 m deep directly below a 16-20 m thick conglomerate unit that has been associated with significant periodic w
Jan 1, 2015
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Study of Energy Release Associated with Coal Burst Occurrence
By Chengguo Zhang, Bruce Hebblewhite, Faham Tahmasebinia, lsmet Canbulat
"Coal burst is a dynamic release of energy within the rock (or coal) mass leading to high velocity expulsion of the broken/ failed material into mine openings. This phenomenon has been recognised as o
Jan 1, 2016
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Axial Performance of a Modified Fully Grouted Cable Bolt Tested with a New Laboratory Short Encapsulation Pull Test
By Paul C. Hagan, Jianhang Chen, Serkan Saydam
"Modified cable bolts are commonly used in underground mines due to their superior performance in preventing bed separation when compared with plain strands. To better test the axial performance of a
Jan 1, 2015
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Introduction to Rock Strength Borehole Probe (RSBP) for Estimation of Rock Strength in Roofbolt Drill Holes
By I. Sedat Buyuksagis, Jamal Rostami, Ali Naeimipour
"Improving the safety of underground openings and optimizing ground support systems requires reliable ground characterization. This includes understanding the joints, discontinuities, and rock strengt
Jan 1, 2016
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Highwall Stability Implications from Longwall Mining at Broadmeadow Mine
By Bob Coutts, Matt Martin, Dan Lynch, Dan Payne
"The Broadmeadow punch longwall coal mine in Central Queensland Australia has experienced significant highwall movement associated with the effect of longwall subsidence when the longwalls approach th
Jan 1, 2018
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Calibrating LaModel for Subsidence
By Keith A. Heasley, Jian Yang
"LaModel uses a laminated overburden boundary-element model and can calculate not only seam-level stresses and displacements but also surface subsidence for thin tabular deposit such as coal seams (He
Jan 1, 2016
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Development and Evaluation of Corrosion Resistant Coating for Expandable Rock Bolt against Highly-Corrosive Ground Conditions
By Kevin J. Ma, John Stankus, Dakota Faulkner
"Expandable rock bolts are widely used in hard rock mines as an efficient ground control product. However, capacity and service life can be significantly reduced if the metallic body is subjected to c
Jan 1, 2017
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Considerations for Effective Ground Support in Evaporites
By C. A. Vining, J. R. Nopola
"Evaporites, such as salt and potash, pose unique problems to ground-support designs not encountered in other rock types. Evaporites are subject to continual creep and no amount of ground support can
Jan 1, 2018
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Rock Slope Stability Comparison Between Deterministic and Probabilistic Block Theory Analyses for An Open Pit Mine
By Pinnaduwa H. S. W. Kulatilake
A new formulation is given to conduct a probabilistic block theory analysis. A new computer code (BTAC) has been developed to perform both deterministic and probabilistic block theory analyses. The va
Jan 1, 2014
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Development of a Numerical Model for the Approximation of Stress Distribution for a Single Vertical Backfilled Stope
By Christopher Newman, Zach Agioutantis, Gabriel S. Esterhuizen
"As conventional underground deposits are continuing to be depleted, mining operations have been forced to produce at greater depths and in more geologically and geometrically challenging conditions.
Jan 1, 2018
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The Potential of Using Coal Washing Plant Waste As a Backfill in Room and Pillar Mines
By Anthony (Sam) J. S. Spearing
Backfilling using coal waste is not a novel means for waste disposal throughout the world; yet, backfilling using a high density (paste) backfill is relatively new, except in Germany and Poland. One o
Jan 1, 2013
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Tekcrete Fast®: Fiber-Reinforced, Rapid-Setting Sprayed Concrete for Rib and Surface Control
By Stephen C. Tadolini, Minova USA Inc., Peter S. Mills, David R. Burkhard
"Fiber-reinforced spayed concrete has been used for several years in civil and tunneling operations. Research conducted to reduce cure times and increase compressive and flexural strengths resulted in
Jan 1, 2017
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Design of Roof Bolt Based Breaker Line Support in a Mechanised Depillaring Panel
By Sahendra Ram, Arnn Kr Singh, Dheeraj Kumar, Rajendra Singh
"Inherent existence of different rooms (openings) along the extraction line in a depillaring panel provides an easy path for the goaf to encroach the working area. Each of these openings in a mechaniz
Jan 1, 2016
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Key Technologies of Integration of Coal Mining–Gangue Washing–Gob Backfilling
By Wei Yin, Yu Wu, Xiexing Miao
"For engineering problems of “three under” coal (coal trapped under buildings, waters-bodies and railways) exploitation, environment protection and gangue separation from raw coal underground exist in
Jan 1, 2015
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Sandy Creek Waterfall?Case Study of Successful Management of the Potential Impacts of Longwall Mining on a Sensitive Natural Surface Feature
By Bruce K. Hebblewhite
BHP Billiton Illawarra Coal operates Dendrobium Mine in an area 10-20km west-northwest of Wollongong in the Southern Coalfield of New South Wales, Australia. The mine recently completed longwall mini
Jan 1, 2014
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Application of Regional Subspace Detection to Identify Mining Related Seismicity
By Keith D. Koper, Kris L. Pankow, Derrick J. A. Chambers, Michael K. McCarter
"In a mining environment, high quality seismic event catalogs are often useful in interpreting local stress states and identifying areas with elevated ground control risk. Installation, operation, and
Jan 1, 2015
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Development Process for a Greater Capacity Propsetter® System
By Christopher J. Brown
"Proper ground stability in gate roads has been a critical aspect of success in longwall mining. In particular, the tailgate has proven to be one of the more active mine areas that needs to be managed
Jan 1, 2017
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Biaxial Horizontal Swelling Strains in West Virginia Coal Mine Roof Rocks in Response to Moisture Adsorption
By Monte R. Hieb
Study of moisture-induced swelling strain in Pennsylvanian Period rocks of the Appalachian Plateau in West Virginia shows a 2:1 biaxial horizontal anisotropy which trends NW-SE. Oriented in-situ slabs
Jan 1, 2013