Underground High Resolution Seismic Method As A Low Cost Alternative For Mapping Sandstone Replacement Channels In Coal Mines

Rodriguez, Rene
Organization: International Conference on Ground Control in Mining
Pages: 6
Publication Date: Jan 1, 1994
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 economic losses to the mine operator. Definition of the encountered channel usually involves intensive drilling; vertically from the surface and/or horizontally from underground vantage points. Coal operators with limited resources often resort to exploration by extending mine faces toward the channel. Both drilling and underground mining exploration are prohibitively expensive and usually provide only partial information about the location, size and shape of the sandstone channel. A low cost alternative which can also provide a more comprehensive picture of the channel is the application of Underground High Resolution Seismic Methods (UHRSM) developed and successfully tested by GECOH Exploration. UHRSM applies surface seismic reflection technology rotated as needed (usually 90 degrees) to accommodate the faces of the exposed channel, coal rib, or coal in front of the inclusion (sandstone channel, etc.). This entails placing high frequency seismic sources and geophones horizontally across these exposed faces. Refraction and reflection events from the front and back of the channel are isolated, analyzed and inverted, to calculate the channel's location and geometry. This paper presents a summary of the geophysical exploration technique and two case history examples where it was applied. In the first case, the accuracy of the technique was verified through subsequent mining. Mining is yet to commence in the second case. Both cases were applied to room-and-pillar nines where the irregular rib lines significantly extended the data processing effort. This suggests that UHRSM will find the easiest application when used along straight rib lines, but that is not a requisite to the application. The UHRSM should find ready application in longwall mining to delineate sandstone channels and other non-coal inclusions in the middle of the panels or ahead of the gate road faces.
Full Article Download:
(1462 kb)

Additional chapters/articles from the SME-ICGCM book Proceedings of 13th International Conference on Ground Control in Mining

Cable Bolting - Potential Applications For Variable Strata C
Evaluation Of Support Performance In A Highly Stressed Mine
Operational Experience With FLEXIBOLT Systems In Australian
Roofbolting In The Cape Breton Development Corporation'
Some Factors Influencing Stability Of Longwall Gateroad
Design Of Roadway Support Using A Strain Softening Model
Automation Of A Progressive Failure Procedure For Analysis O
The Massive Collapse Of Coal Pillars - Case Histories From T
Time Dependent Strength Of Coal Strata For Long-Term Pillar
Yield Pillar Behavior At Jim Walter No. 7 Mine Stress And St
A Comparison Of Overburden Response Due To Longwall Mining
Longwall Ground Behavior Characteristics In The Illinois Coa
Cavability Study Of A Competent Roof - A Case Study
Roof Pressure Monitoring Using The Integrated Longwalt Autom
Longwall Production, Maintenance, And Roof Control System
The Design And Selection Of Powered Supports For Application
Tailgate Support Practice In U.S. Longwall Mines - A Survey
Influence Of Support Capacity And Geometry On Tailgate Suppo
Innovative Concept In Tailgate Entry Support: Elimination Of
Resin-Grouted Cables For Longwall Tailgate Support Stability
Tailgate Roadway Convergence: A Key Indicator Of Potential G
Assessment Of Wood And Alternative Materials For Supplementa
Experience With The Boundary Element Method Of Numerical Mod
The Fault At The End Of The Tunnel
Microseismic Monitoring In The Sydney Coalfield
Realistic Design Of Ground Control Based On Geotechnical Dat
Underground High Resolution Seismic Method As A Low Cost Alt
Pillarless Longwall Mining For Multiple Seams
Stable Entry Design In A Multi-Seam Environment
Evaluating Roof Control In Underground Coal Mines With The C
Hazard Mapping Combining Geostatistical Modeling Of Coal Min
Stereological Sampling And Analysis For Characterizing Disco
Determining Horizontal Stress Direction Using The Stress Map
Stability And Stress Evaluation In Mines Using In-Seam Seism
Hydrogeologic Effects Of Subsidence At A Longwall Mine In Th
Monitoring Railroad Response To Mining Subsidence And Assess
Study On The High-Pressure Grouting Of The Overburden For Su