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Analytical Investigation of Shaft Damages at West Elk Mine
By Tim Ross
Several shear failures were observed in Shaft #1 at the Mountain Coal Company, LLC, West Elk Mine, after mining longwall Panel 23, 1,100 ft to the east of Shaft #1. It was speculated that this shear
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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Calibrating the Lamodel Program for Site Specific Conditions
By Keith A. Heasley
The LaModel program has been used successfully in the United States for many years to design pillars to ensure global stability of pillar recovery operations. However, the recent Crandall Canyon Mine
Jan 1, 2012
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CISPM-MS: A Tool to Predict Surface Subsidence and to Study Interactions Associated with Multi?Seam Mining Operations
By Yi Luo
Multiple-seam mining operations induce surface subsidence basins different from those caused by mining in a single coal seam, and also disturb the mining operations in the other coal seams. A computer
Jan 1, 2012
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The Estimation of Ground Control Risk By Real?Time Quantitative Visual Assessments
By Alexander Garcia
Roof and rib falls are the basic ground control hazards associated with underground roadways during development, stand up and, if applicable, retreat. Falls of ground can happen following the deterior
Jan 1, 2012
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Passive Seismic Imaging for Determination of the Longwall Rear Abutment Location
By Erik Westman
Few studies have been conducted regarding the location, movement, and relative magnitude of the rear abutment of a longwall coal mine. The rear abutment, or the abutment pressure arch in the gob area,
Jan 1, 2012
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Overburden Subsidence Characteristics When Mining in Weak Rocks and Subject to Special Mining Conditions
By Wenquan Zhang
Based on the mining and geological conditions of Wadong Mine, Longkou City, Shandong Province, China, a viscoelastic model with proper creep parameters was established. The 3-D ANSYS was used to simul
Jan 1, 2006
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Roof Control Under Conditions of Shallow Depth and High Horizontal Stress Field -A Case Study
By Yajie Wang
Traditionally, roof falls are usually attributed to bad roof strata and high vertical stress related to the overburden depth. However, roof falls under shallow overburden depth are oflen caused by a h
Jan 1, 1998
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Coal Bumps And Odd Dynamic Phenomena - A Numerical Investigation (70cea8ce-38a7-4c88-a596-77cf801d31b0)
By Jeffrey K. Whyatt
The Crandall Canyon accident investigation included an interesting and unexplained observation by rescuers that the ?barrier rib had shifted northward as a unit, as much as 10 feet.? This is not the
Jan 1, 2009
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Rockburst Prevention in the German Coal Industry
By Rudiger Baltz
The sudden failure of bodies of rock is a serious problem commonly experienced in the international mining industry. These explosive releases of energy are referred-to as ?bumps?, ?outbursts? and ?roc
Jan 1, 2008
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Geology, Ground Control, and Mine Planning at Bowie Resources, Paonia, CO
By Collin Stewart
Bowie Resources maintains one of the most pro-active ground control programs in the U.S. mining industry today. Its guiding philosophy is that everyone in the organization, from the miners at the fac
Jan 1, 2006
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Massive Pillar Collapse: a Room?and?Pillar Marble Mine Case Study
By Sandin E. Phillipson
The Mine Safety and Health Administration?s Roof Control Division responded to a massive ground failure at an underground marble mine in northern Georgia. The ground failure occurred in a benched area
Jan 1, 2012
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Practical Strata Management, Beltana No. 1 Mine, Australia
By Shane McDonald
Australia produces approximately 84 million tonnes of coal per annum from 30 longwalls in New South Wales and Queensland, operating at an average depth of around 300m. Industry trends and expectations
Jan 1, 2008
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Towards an Improved Stone Mine Pillar Design Methodology: Observations from a Mistake
By Francis Kendorski
The mining engineering design professional has limited practical and reliable tools for planning successful room-and-pillar stone mines using readily-available and collectible information. Three tech
Jan 1, 2007
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Strata Movement of Protective Seam Mining with Large Interburden ?? A Case Study
By Changsheng Song
With increasing depth of coal mining in China, the number of coal and gas outbursts has been increasing for years. By means of destressing the protective seam, the gas in the protected seam is drained
Jan 1, 2008
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New Developments In Headed Rebar Ground Support (e1369dc5-cd64-41ac-8b6d-861d8d628824)
By Roland C. Walker
Traditional headed rebar has existed in the mining industry as a ground support product for many years. The head of a rebar bolt is most commonly produced by hot upset die forging. Upset die forging
Jan 1, 2009
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Determination of the Strength of Powered Roof Supports According for Fatigue Life
By Monika Patrycja Polak - Micewicz
This paper presents an approach for estimating the fatigue life for the base of powered roof supports (shield) manufactured by the FAZOS roof support company. FAZOS?s powered roof supports are designe
Jan 1, 2012
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Coal-Mining-Induced Seismicity in Utah?Improving Spatial Resolution Using Double-Difference Relocations
By Kristineq Pankow
The August 2007 Crandall Canyon mine disaster raised national awareness of mining-induced seismicity (MIS) in Utah as well as general interest in how seismic monitoring might improve mine safety in th
Jan 1, 2008
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Effects of Specimen Age on the Uniaxial Compressive Strength and Moisture Content of Weak Coal Measure Rocks
By Timothy Barton
The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine design. While there are standardized procedures for how to conduct UCS
Jan 1, 2008
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Development of Low Profile Remote Roof Bolting Module
By Bill Kyslinger
In underground mining, machine design is predominantly dictated by mine conditions and individual customer desires. In partnership with Boart Longyear Poland and KGHM, J. H. Fletcher & Company was ta
Jan 1, 2006