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Feasibility Study And Design Of A New Underground Coal Mine Developed From Open Cut Highwall In Indonesia (25d3d094-fa9d-4970-a166-6a4fe20badce)
By Takashi Sasaoka
About 200 M tons of coal were imported into Japan in 2007 and Indonesia was its second largest exporter, accounting for about 30 M tons (12% of the total imported coal). Indonesia produced about 200 M
Jan 1, 2009
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Application of Chain Conveyor Cutter (Ccc) to Highwall Mininig System
By Takashi Sasaoka
Chain Conveyor Cutter (CCC) is a chainsaw-type machine and originally developed for the construction of underground walls and/or ground improvements. CCC was developed from the accumulated technology
Jan 1, 2012
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Development of Timedependent Surface Subsidence Over the Total Extractions Areas of the Potash Beds Stoped with Interchamber Yield Pillars
By M. P. Nesterov
The method of predicting the time-dependent surface subsidence for gently-inclined potash deposits where total extraction using various sizes of yielding bamier pillars was discussed.
Jan 1, 1998
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Global Trends in Coal Mine Horizontal Stress Measurements
By Christopher Mark
Knowledge of in situ stresses is fundamental to many studies in earth sciences, and coal mine ground control is no exception. During the past 20 years, it has become clear that horizontal stress is
Jan 1, 2008
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Longwall Mining in Illinois: A Controversy over Planned Subsidence of Flat Farmland
By Daniel Barkley
Underground coal mining in Illinois has a lengthy history dating back to the early 1800?s. High extraction underground mining has played a significant role in production through out this time. Mode
Jan 1, 2007
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Application Of Short-Term Time-Dependent Plate Loading Tests For Estimation Of In-Situ Elastic And Viscous Parameters Of Weak Floor Strata
By Gang Chen
This paper explores the possibility of using short-term time-dependent plate loading tests to estimate the elastic and viscoelastic parameters of the weak floor strata typically associated with coal s
Jan 1, 1990
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Geologic Conditions Affecting Mineability in the Jane Mine.
By Stephen J. Harven
Geologic conditions in eight northern operating sections of Jane Mine, Keystone Coal Mining Complex. Armstrong County, Pennsylvania are defined by utilizing drillhole data and underground geologic map
Jan 1, 1987
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Effects of Rock/Coal Interface Property on Coal Pillar Strength
By Jun Lu
There are many factors affecting the strength of pillar, including width-to-height (W/H) ratio, mechanical properties of coal and surrounding rocks, property of partings in the coal, and the interface
Jan 1, 2008
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On Rock Failure Criteria for Coal Measure Rocks
By Murali Gadde
Design of underground excavations in coal mines involves two major tasks: estimation of stresses and determination of rock mass strength. Owing to the complicated nature of rock mass, progress in its
Jan 1, 2007
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Correlation of Acoustic Emission (A.E.) with Physical and Mechanical Properties of Different Types of Rock and Coal Specimens
By Brijes Mishra
This paper presents a correlation of acoustic emission (A.E.) with physical and mechanical properties of different types of rock and coal specimens which were tested under aegis of a consultancy proje
Jan 1, 2006
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Rock Mechanics Investigations on Seismic Events Around Two Longwall Coal Operations
By Michael Alber
Coal mining by the longwall method typically causes seismic events. This paper describes the research on mining induced seismicity around two specific longwalls at 1100m depth under several old longwa
Jan 1, 2008
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Convergence And Load Measurements In An Underground Mine In [Türk±ye]
By A. G. Pasamehmetoglu
This paper describes the conver¬gence and load measurements carried out in inclined seams at five longwall faces, two of which were supported by hydraulic props and the other three by conventional tim
Jan 1, 1992
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Multiple Seam Mining Interactions: Case Histories from the Harris No. 1 Mine (b50cab1b-ba36-4377-a652-1d452c62f433)
By Frank E. Chase
The Harris No. 1 Mine, located in Boone County, WV, has been longwalling the Eagle Coalbed for over 30 years. Harris has experienced numerous interactions associated with the extensive room-and-pillar
Jan 1, 2005
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Progressive Hangingwall Caving And Subsidence Prediction At The San Giovanni Mine, Italy
By R. Balia
The upper part of the "Contatto Ovest" orebody, at the San Giovanni Pb-Zn sulphur mine (Sardinia, Italy), is mined by a sublevel caving method. With increasing mining depth, a progressive caving of th
Jan 1, 1990
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"Void Fill Techniques for Stabilizing Roof Conditions during LongwallShield Recovery"
By Rusty Mchenry, Craig Dickerson, Robin L. Oldham
"It has been proven that longwall faces can be moved safely and efficiently. However, abutment pressures and poor ground control conditions can halt operations and be hazardous to coal miners. Recentl
Jan 1, 2015
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Roof Bolter Rocker Pad Deflector Systems (6ff5d1f9-2211-4169-8a90-2ad9493ee24a)
By Arnold Hammons
Automated temporary roof support (ATRS) systems have been incorporated into roof bolters since the 1970?s. During roof bolting, many injuries have occurred from large pieces of draw rock falling inby
Jan 1, 2009
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Strata Mechanics Of Pillar Extraction Goaf Edges (001afab8-c7ac-48fa-af96-b8de57c1318e)
By John Shepherd
Pillar extraction carried out using various methods (split and lift, Wongawilli and old Ben) involves the formation of narrow fenders (commonly 7 m of coal) formed by driving "splits" for lifting off
Jan 1, 1992
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Ground Control in the Underground Coal Mines of Colombia
By Christopher Mark
Colombia is 11th largest coal producing nation in the world, and the world?s fifth largest coal exporter. But while most of Colombia?s coal is mined at large modern surface mines located near the Cari
Jan 1, 2014
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Three?Dimensional Ground Stability Study Around a Mine Tunnel in a Highly Discontinuous Rock Mass under Significant in Situ Stress
By Pinnaduwa H. S. W. Kulatilake
To exploit an underground mine effectively and safely, it is important to have a good understanding of the geotechnical behavior of the rockmass surrounding the underground mine excavation. The aim of
Jan 1, 2013
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Application of the Coal Mine Roof Rating, Derived from Drill Core, in the Roof Support Design of a Coal Belt Conveyor Tunnel
By John Rusnak
The Coal Mine Roof Rating (CMRR) is a practical rock mass classification system for use in design of mine openings. Data can be obtained for this purpose from exploration drill cores if simple geotech
Jan 1, 1998