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|Barrier pillars created during mine development provide additional reserves during mine closure and can be the sole access to reserves previously abandoned because of mining height or out of seam dilution limitations. The safe and successful mining of barrier pillars requires a thorough knowledge of the magnitude and distribution of the vertical stress field in addition to the strength and physical properties of the coal, immediate roof, and immediate floor strata. Quantifying the vertical stress field is complicated by the combination of the overburden stress, abutment stresses transferred onto the barrier pillar from adjacent gob areas, and in multiple seam mining, stresses transferred from abandoned subjacent mines. These variables make the extraction and development of barrier pillar reserves a site specific consideration. Three case histories are presented in which barrier pillar development and extraction provides; i) an access point and the means to ventilate a large area of low seam reserves left by a prior operator after developing only the thicker areas of a multiple split reserve, ii) the means to increase total recovery of a deep, thick seam longwall reserve, and iii) opportunities for the development and retreat mining of a two mile long barrier pillar in thick seam reserves.|
Additional chapters/articles from the SME-ICGCM book Proceedings of 14th International Conference on Ground Control in fining
|Truss Systems For Longwall Tailgate Support - Update||Cable Support Systems For Longwall Gate Road Stability||Innovative Tailgate Support For Heavy Ground: 11 Left Longwa||Parameters Affecting Resin-Anchored Cable Bolt Performance:||Roof Support Performance In High Stress Conditions||Regional Horizontal Stress And Its Effect On Longwall Mining||Deformation Development Around Mine Roadways And Simulation||Monitoring Mobile Roof Supports||Analysis Of Retreat Mining Pillar Stability||Planning And Design For Barrier Pillar Recovery Three Case H||Influence Of Partings In A Coal Seam On Long Term Pillar Sta||A Cooperative Study Of Gate Entry Designs Welbeck Colliery (||Comparative Case Study Of Yielding And Critical Coal Pillar||Comparison Of Empirical, Analytical, And Numerical Methods O||Nonlinear Approach For Determining Design Criteria For Yield||In-Situ Coal Strength Determination - Case Studies||The Design And Application Of Propsetter? In Underground Coa||Renewed Interest In Prop Supports As A Replacement For Wood||Improved Intersection Design And Monitoring In The Sydney Co||Drivage System In Retreat Longwall Gateroad||Case Study Of Stability Investigations Related To Shallow Un||Analysis Of Rockbolt Performance At The Waste Isolation Pilo||Continuous Improvement In Cuttable Coal Rib Support In Austr||Floor Failure Induced By Lateral Stress Ahead Of Longwall Su||Towards A Method Of Determining Floor Quality In An Undergro||Chinese And North American High-Extraction Underground Coal||Integration Of CAD-Based Mine Planning And Subsidence Engine||Development Of A Subsidence Database And Determination Of Su||Statistical Regional Calibration Of Subsidence Prediction Mo||Subsidence Monitoring Results, Thick Seam Longwall Mining In||Application Of Mechanical And Groundwater-Flow Models To Pre||The Application Of Underground In-Seam Seismic Methods (UISS||Vertical Stress Redistribution Around A Retreating Longwall||Entry Stability Monitoring & Analysis For Longwall & Continu||A Case Study Of A Deformation Mechanism Around A Two-Entry G||Multiseam Mining On South African Collieries||Design And Planning Of Lower Seam Longwall Gateroads||Optimizing Pillar Design In A Multi-Seam Environment|