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Short-encapsulation Pull Tests for Roof Bolt Evaluation at an Operating Coal Mine (d859e8fa-c0f1-49be-9743-84926e16279e)
By James Pile
The San Juan Coal Mine, located near Farmington, New Mexico, supplies the San Juan Generating Station with more than 6 million tons of coal annually. To replace dwindling surface mine production, San
Jan 1, 2003
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Underground High Resolution Seismic Method As A Low Cost Alternative For Mapping Sandstone Replacement Channels In Coal Mines
By Rene Rodriguez
Sandstone paleo-channels encountered during coal mining operation can significantly slow down the advance in mining, and often completely shut-down coal mine production, with consequent extensive econ
Jan 1, 1994
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A Case Study Of Grouted Roof Bolt Loading In A Two-Entry Gate Road
By Stephen P. Signer
A field test was conducted by the U.S. Bureau of Mines at the Cyprus Plateau Starpoint No. 2 Mine. near Price. UT. to study the support rock interaction mechanics. Twelve instrumented. fully grouted r
Jan 1, 1990
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Numerical Modeling of the Gob Loading Mechanism in Longwall Coal Mines
By Khaled Morsy
Longwall mining is one of the most widely practiced underground coal mining method. The behavior of the longwall gob is very critical in the understanding of the complex ground response to longwall mi
Jan 1, 2002
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Systems Used In Coal Mining Development In Long Tendon Reinforcement
By Brian Clifford
A wide range of different cablebolt systems are available and in use in hard rock and coal mines around the world. The birdcaged cablebolt was initially used in UK coal mines in conjunction with ro
Jan 1, 2001
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Investigation Of Seam Thickness And Seam Splitting Within A Longwall Panel By An In-Seam Seismic Survey
By Wolfgang Schott
The propagation velocity of in-seam seismic (ISS ) waves depends on frequency which is also known as dispersion. This dispersion is not only determined by the thickness of the coal seam and its dirt h
Jan 1, 2003
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Current Trends In Roof Truss Hardware
By C. P. Mangelsdorf
The success of the Birmingham roof truss (Figure 1) in supporting some difficult roof conditions, particularly in the Illinois coal basin, has given impetus to the development of a number of alternate
Jan 1, 1982
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Determination Of The Stopline Subsidence Profile Of Phalen 2 West Panel From Within A Near Horizontal Borehole Over The Panel Stopline
By William D. Gallant
This paper presents the results of a joint cooperative research project between the CANMET Cape Breton Coal Research Laboratory and the Cape Breton Development Corporation to observe the subsidence pr
Jan 1, 1990
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The Influence Of Certain Geologic And Geotechnical Factors On Coal Mine Floor Stability - A Case Study - Introduction
By Robert C. Speck
Floor heave or deformation of the mine floor into the mine opening is a problem which has plagued coal mines in this country and others. In mining areas where room and pillar mining is practiced, floo
Jan 1, 1981
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Roof Sounding Device - A Loose Rock Detector
By Richard C. Repsher
The U.S. Bureau of Mines has developed a method and device designed to detect lose rock material in underground mines. The technology is designed to be an aid to mine workers in detecting hazardous ro
Jan 1, 1990
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Case Studies Of Progressive Pillar Failure In Two Mines Using Wide Pillars
By Hamid Maleki
Results of geologic investigations, in-mine instrumentation, and numerical modeling are presented for two longwall mines in which pillars with large width-to-height ratios (8 to 9) are used. These inv
Jan 1, 2000
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Constraint Is The Prime Variable In Pillar Strength
By Clarence O. Babcock
Since Vicat in 1833, the width to height ratio of a mine pillar has been taken as the fundamental variable in pillar design. From work in the laboratory by many investigators testing rock, Coal and co
Jan 1, 1984
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SOMA: A New Method to Calculate the Operative Stress Field: Results from the Laurel Mountain Mine, Russell Co., Virginia
By Craig Byington
The stress-field orientation mapping and analysis (SOMA) technique for determining the operative stress field near mine workings and its relationship to various fracture sets is described using Dicken
Jan 1, 2004
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Prediction Of Shearer Cutting Performance (2d8ef98a-f84a-4c60-8ac8-2edff3e8f14f)
By D. L. Price
This paper presents a method of measuring field power consumption of shearers and deriving specific energy consumption versus shearer haulage speed performance curves. A description of a computer prog
Jan 1, 1992
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Use Of Automated Resistivity System To Locate Potential Subsidence Areas Over Old Mines
By Richard G. Burdick
The Bureau of Mines', Denver Research Center has been conducting research for the past few years on the use of resistivity methods to locate abandoned mine workings. As this work has progressed,
Jan 1, 1982
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Mining Under Rivers In Fuxin Coal Mines
By Liang Yin-Huai
In Fuxin Coal Mines, there are more than 20 million tons of coal buried under seasonal streams. The coal seams are mostly shallow. We have mined more then 50 mining blocks distributed in 5 coal mines.
Jan 1, 1990
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The Utilization Of Rockbolting Technology And Monitoring Techniques In The German Coal Fields
By Thomas Lautsch
After a short description of geology and gateroad roof support technology in the German coalfields the development of roof bolting as primary roof support is presented. Based on geotechnical parame
Jan 1, 2000
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Ground Control In Multiple Seam Mining
By Robert A. Stansbury
The No. 14 Mine of United States Steel Corp- oration is located at Munson, West Virginia, in &Dowell County. The mine was originally assigned 7,530 acres of Pocahontas 3, 4 and 5 Seams. Production beg
Jan 1, 1981
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An Approach To Identifying Geological Properties From Roof Bolter Drilling Parameters
By Gerald I. Finfinger
Identifying the properties of overlying rocks in underground mining operations is important to ensure the appropriate roof support design is used to maintain stability of the mine entries. Recently J.
Jan 1, 2000
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Underground Application Of Optimization
By S. J. Jung
The goal of this research is to demonstrate how optimization methodology can be coupled with the finite element method for greater stability of underground mine openings. As a result of increasing min
Jan 1, 1993