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Surface Subsidence. in Longwall Mining--A Case Stud
By R. D. Yancich
A case study of longwall mining surface subsidence was performed at a mine in Southwestern Pennsylvania. The mine operated in the Pittsburgh coal seam which averaged 70-72 inches with 6-8 inches draw
Jan 1, 1984
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Subsidence Misconceptions And Myths
By Richard E. Gray
Subsidence due to coal mining is poorly understood by non-specialists. This has led to numerous misconceptions and myths based on limited observations and lack of knowledge. The three most common are:
Jan 1, 1996
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Comparison of the Performance of Active and Passive Roof Bolts in An Illinois Basin Coal Mine
By Anil K. Ray
This paper discusses in situ studies conducted at an Illinois Basin room-and-pillar coal mine to evaluate the performances of three different types of bolts under similar geologic conditions. The bolt
Jan 1, 2012
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Advancements in the Use of High-Modulus Polymer Mining Grids to Speed Longwall Recovery
By Thomas A. Bailey
Since the advent of longwall mining, various methods and materials have been used during relocation to control the intrusion of the gob in the shield/panline area. (figure 1) Controlling this gob is c
Jan 1, 2006
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Electrical Measurements of Coal Measure Rocks for Electromagnetic Applications in Mining Industry
By Nikolay Boykov
Subsurface imaging technologies are part of the electromagnetic (EM) geophysical methods. EM technologies such as radio imaging method (RIM), ground penetrating radar (GPR), and drill string radar (DS
Jan 1, 2006
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Innovation in Rock Mechanics: Iced Tailings As Structural Backfill for the Citronen Mine, Ironbark Zinc Ltd., Greenland
By Andrew P. Schissler
The Citronen Zinc-Lead Project is one of the world?s largest undeveloped zinc-lead resources, containing more than 13 billion pounds of zinc and lead metal. The project is located in northern Greenlan
Jan 1, 2012
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Characteristics of Coal Bursts in the North Fork Valley of the Gunnison River Valley, Colorado
By Christopher Mark
A coal burst is defined as the sudden, violent ejection of coal or rock into a mine opening. Coal mines in the North Fork Valley (NFV) of Colorado?s Gunnison River have a long history of coal bursts i
Jan 1, 2012
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Seismic Studies Over Active Longwall Mines
By Thomas H. Wilson
Common offset and refraction seismic data have been collected over four longwall panels at two different locations within West Virginia. Surveys prior, during and after mining were made in both areas.
Jan 1, 1988
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Cost Preventive System To Control Unstable Roof In Main Line Haulage Entries
By John Popovich
The MICON RokLok binder system including component and consolidation processes and safety and its first aide are described. The implementation procedures and selection of injection parameters are disc
Jan 1, 2001
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Behavior of Welded Wire Mesh Used for Skin Control in Underground Coal Mines
By Murali M. Gadde
Welded wire mesh is the most commonly used skin control technique in the United States underground coal mines. Currently, selection of the mesh is based on trial and error rather than any rigorous des
Jan 1, 2006
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The Design And Selection Of Powered Supports For Application In 4.5 Metre Extraction At Daw Mill Colliery
By Clive Chadbourne
Investigations of world wide coal face strata control practice, the study of theoretical calculations and detailed engineering analysis have been combined to design and select a powered roof support s
Jan 1, 1994
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Relationship between the clay fabric of roof shales and roof collapse in mines of the Herrin cod, southern Illinois
By Theresa M. Bodus
The strength of roof shales is, in part, a function of the preferred orientation of clay minerals within them. Therefore, analysis of clay fabric under both air-dried and hydrated conditions should be
Jan 1, 1989
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The Extraction of Main Heading Pillars with a Longwall at Nre Wongawilli Colliery
By Ry Stone
To maintain longwall continuity, NRE Wongawilli Colliery extracted the approximately 20-year-old Thompson Mains and in doing so, 20 roadways were holed into during longwall retreat. The orientation of
Jan 1, 2012
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Nonlinear Approach For Determining Design Criteria For Yield Pillar Performance
By W. Smith
The U.S. Bureau of Mines (USBM) is using laboratory and computer-based techniques to investigate the post- failure behavior of yielding pillars and pillar reinforcement techniques to control entry def
Jan 1, 1995
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Pillar Design Issues For Underground Stone Mines (5c6602ba-4b85-4ec3-ad15-c1c321c1afcd)
By A. T. Iannacchione
Underground stone mining represents an emerging sector for the U.S. mining industry. As this expansion takes mines under deeper cover and as more efficient mining methods are utilized, adequate stone
Jan 1, 1999
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Think Like a Roof Bolt ? Then Make It Scream ?
By Greg Smith
This paper documents the use of bench testing equipment developed to enhance the understanding of, and improve upon, common roof bolt support systems. Most roof bolt systems consist of components that
Jan 1, 2012
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Roadway Strata Management in the New South Wales Underground Coal Mining Industry
By Rob Thomas
Strata management is a critical and now necessary requirement in the New South Wales underground coal mining industry. As a formal and structured process, strata management allows ground supp
Jan 1, 2007
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Optimizing Pillar Design In A Multi-Seam Environment
By R. Kanniganti
The primary problems of pillar design in seams subject to interaction are due not only to difficulties in predicting loading, but also to the often unsymmetrical nature of the stress fields. The effec
Jan 1, 1995
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Beyond Coalbrook: Critical Review of Coal Strata Control Developments in South Africa
By J. Nielen van der Merwe
Rock engineering research and technology development in South Africa only received serious attention in reaction to the Coalbrook disaster in 1960. At the time, a number of gaps in knowledge of rock r
Jan 1, 2006
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Three-Seam Interaction: A Case Study
By N. P. Kripakov
Results of a complex three-seam interaction analysis in a western U.S. coal mine are presented. The physical situation simulated by the models represents the development of a set of entries underneath
Jan 1, 1996