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Estimation Of Long-Term Stability Of Mine Pillars In Underground Pit
By S. Yamashita
Recently in Japan, unexpected degradation (surface subsidence) at old underground quarry sites, such as 'Ohya-Ishi' (pumice tuff) pit field has often been occurred. At these quarry sites, th
Jan 1, 1996
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Study Of Coal Fragmentation Under Conical Bit Indentation (151fd177-8c94-4b7d-bb78-001df228dd2a)
By S. J. Jung
A fundamental study of fragment size distribution and characteristics of fracture pattern is presented for the dynamic penetration of a conical bit into coal block. In this paper, damaged zones during
Jan 1, 1989
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Geostatistical Methods For Hazard Assessment And Site Characterization In Mining
By Jennifer Riefenberg
Ground control hazards, coal quality, ore reserve estimation, and pollution modeling seem unrelated topics from most mining perspectives. However, geostatistical methods can be used to characterize ea
Jan 1, 1996
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Effect of the Interchamber Pi Yield on the Surface Strains in the Movement Trough Edges
By Mikhail P. Nesterov
The paper presents the results of the research that can forecast the development of subsidences and deformations of the earth surface with time in the permanent marginal areas of the movement troughs
Jan 1, 1997
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Clay Veins: Their Physical Characteristics. Prediction, and Support
By Frank E. Chase
Clay veins, also referred to as clay elastic dikes, have been responsible for numerous underground injuries and fatalities. These hazardous structures are also responsible for increased production cos
Jan 1, 1984
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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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Pillar Reinforcement or Rib Support?
By André C. Zingano
The coal pillars in room-and-pillar mining method are subjected to vertical stress due to overburden rock mass and horizontal stress relieve due to entries excavation around them. Some coal mining com
Jan 1, 2006
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Donut Cribbing--A Hew Heavy-Duty Roof Support Concept
By Nicholas Chlumecky
One of the oldest mine supports in use today is timber cribbing. In many mining operations material, installation and maintenance costs for timber cribbings are substantial. Their performance characte
Jan 1, 1986
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Coal Mine Ground Control in Western Europe; Past, Present and Future
By D. N. Bigby
This paper concentrates on ground control innovation in Europe since the first Morgantown conference, mainly from a UK perspective. In particular, it describes the rock engineering and ground control
Jan 1, 2006
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Investigation of Some Alternatives to Timber Posts and Cribs
By Gavin J. Faulkner
This paper presents an investigation of some alternatives, and improvements to timber posts and cribs. The purpose is to find a cheaper, better, easy to install, and effective means to replace or impr
Jan 1, 1986
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Rock Mechanics Issues In The Trona Patch
By Archie Richardson
The trona mines in the Green River Basin, commonly known as the "trona patch," present an interesting set of rock mechanics issues stemming from mining in a unique underground environment. Like other
Jan 1, 1999
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The Design And Application Of Hercules Cribs For Underground Mining
By Mike Faure
Hercules cribs make use of timber loaded parallel and perpendicular to the grain. Maximum use is made of the orthotropic properties of timber resulting in crib- having superior strength, high initial
Jan 1, 1993
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Control Of Roadway Closure In Underground Coal Mines By Sidewall Weakening Technique
One of the problems associated with the maintenance of roadways in underground coal mines is that of dealing with roadway closure. Sidewall weakening technique is based on the transference of the h
Jan 1, 1990
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In-Seam Seismic Tomography Mapping Application To Coal Mining Problems
Continuing with the effort of providing new and more effective exploration methods to the mining industry, where direct methods (drilling, cross-cutting, etc.) are not applicable, either for logistica
Jan 1, 1996
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Catastrophic Failures of Underground Evaporite Mines
By Jeff Whyatt
Deformation of underground salt, trona and potash mines is generally time dependent, providing for gradual adjustment of strata to mining induced stresses. Time dependence can allow for higher extract
Jan 1, 2008
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Drainage Of Water From Abandoned Mines By Horizontal Drilling
By Alan J. Zeni
Drainage of water from abandoned underground mines has become important in recent years because of safety concerns when mining near abandoned works or reentering abandoned mines for further developmen
Jan 1, 1990
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Bi-Directional Shield Recovery in a Wide Face Longwall Move with a Pre-Driven Recovery Room under Weak Roof Conditions
By Peter Zhang
Shield recovery in a longwall move is normally conducted from tailgate to headgate. However, if the face is wide and the immediate roof is weak, difficult conditions with considerable roof sag, excess
Jan 1, 2007
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An Improved Technique of In-Situ Measurement Of Fracture Zones Surrounding Gateroads
By B. G. D. Smart
An understanding of the nature of yield zones surrounding coal mine excavations is fundamental to the design of mine support systems. Various methods have been designed for investigation of undergrou
Jan 1, 1984
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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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Historical Perspective And Future Projection Of Longwall Mining In The United States (19eaaffe-326c-46a4-9a81-dc104b2df560)
By Thomas M. Barczak
This report chronicles the historical development of longwall mining in the United States and speculates on future developments to the turn of the century. Five eras of technological development durin
Jan 1, 1992