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Geophysical detection of outbursts. ... As with the in-seam seismic method, coal seams act as a waveguide and electromagnetic waves launched into a coal seam are guided by it. Changes in the conductivity of the coal, or the surrounding rocks change the propagation characteristics of the wave. ...
In coal mining: Geophysical exploration. In geophysical exploration, the seismic, electric, magnetic, radiometric, and gravitational properties of earth materials are measured in order to detect anomalies that may be caused by the presence of mineral deposits. Their form of exploration may begin with airborne methods in regional and. Read More
Geophysics is one of the leading business with long history, covers mainly highly efficient investigation of coal resources, fine investigation of mining geological conditions, detection of the hidden disaster-inducing factors, monitoring and early warning of mining dynamic hazard in coal mines, production and manufacturing of mining geophysical instruments, etc.
Get this from a library! Detection of abandoned underground coal mines by geophysical methods.. [Wilson Fisher, Jr.; HRB-Singer, Inc. Environmental Sciences Branch.; United States. Environmental Protection Agency.; Pennsylvania. Department of Environmental Resources.] -- Acid drainage produced by abandoned coal mines continues to cause serious water pollution problems.
The 2D microtremor profiling technique can be applied to effectively locate the discarded goaves and their associated fracturing and caving zones. The reliability of the goaf detection method has been validated by previous drilling data. Undoubtedly, the 2D microtremor profiling technique provides us a new geophysical method for goaf detection.
Coal mining - Coal mining - Prospecting and exploration: The fundamental objective of coal prospecting is to discover coal resources through a search. In areas where coal mining has not been previously practiced, the search process should result in obtaining coal samples that give reasonable evidence of the existence of a coal seam. Once a seam has been discovered, considerable further work is ...
Exploration geophysics is the applied branch of geophysics which uses surface methods to measure the physical properties of the subsurface Earth, along with the anomalies in these properties, in order to detect or infer the presence and position of ore minerals, hydrocarbons, geothermal reservoirs, groundwater reservoirs, and other geological structures.
A. 1 meter thick coal seam was present at a depth of approximately 9 meters and had been mined in the early 1900's by both the strip and "room and pillar" methods, leaving many "rooms" in the subsurface.
The results show that the electrical characteristics and low-resistance anomaly reflected by the two geophysical methods are in good agreement with each other. Finally, the borehole detection method is used to verify the goaf range obtained from comprehensive geophysical prospecting, and the results show good consistency.
SURFACE GEOPHYSICAL METHODS FOR DETECTION OF UNDERGROUND MINE WORKINGS By ... 1000 feet and it is difficult and expensive to characterize a coal seam with borings. The method .
Coal mine fire is a serious problem in Jharia coal field, India. The coal mine fire can be detected with different techniques such as borehole temperature measurement, thermo-compositional analysis, remote sensing techniques, thermo-graphic measurement and geophysical methods. In this study, various geophysical methods were used to detect ...
underground coal mine void detection by using the in-seam seismic (ISS) technique. This technique refers to methods that utilize artificially generated channel waves trapped in coal seams to locate geologic disturbances and mine voids. ISS is one of the basic geophysical methods for underground survey. The advantage of ISS is that seismic
Detection of Underground Voids in Ohio by Use of Geophysical Methods By Jens Munk and Rodney A. Sheets ABSTRACT Geophysical methods are generally classified as electrical, potential field, and seismic methods. Each method type relies on contrasts of physical properties in the subsurface. Forward models based on
Jul 30, 2013· Highlights I review applications for geophysics in support of coal mining operations. I discuss techniques used for mapping coal seams and geotechnical characterisation. Methods for void detection and monitoring the ground response are also discussed. Future applications for geophysics are also considered.
Abstract Within the framework of the Sino-German research initiative "Innovative technologies for exploration, extinction and monitoring of coal fires in Northern China" a number of different geophysical methods have been applied to determine their use on coal fire detecting, accompanying the extinguishing processes, controlling of the extinction and finally monitoring the extinction success.
Apr 13, 2016· The method of detecting Top of Coal while drilling brings significant benefits to surface mining operations, including: Providing a reliable indication of approach to Top of Coal that will enable drilling to be stopped before touching coal or at a minimum standoff distance. Increase production by reducing damage to coal from blasting.
GEOPHYSICAL VOID DETECTION DEMONSTRATIONS Kanaan Hanna, Bart Hoekstra, Jim Pfeiffer and Brandy Uphouse ZAPATAENGINEERING, Blackhawk Division ABSTRACT This paper describes the results of geophysical field demonstrations conducted at a known abandoned underground coal mine, eastern Illinois. This investigational program, in cooperation
Geophysical Technologies for Detecting Underground Coal Mine Voids, Lexington, KY, July 28-30, 2003 APPLICATIONS OF THE ELECTRICAL RESISTIVITY METHOD FOR DETECTION OF UNDERGROUND MINE WORKINGS by William J. Johnson – D'Appolonia, Monroeville, PA Introduction The need to understand the location of abandoned workings has recently been high-
ISS methods were used because, unlike surface geophysical methods, they are independent of surface conditions such as rough topography and directly target the area of interest. Reflected seam waves can be used to map the coal-void interface. The seam wave will propagate through the coal seam, strike the void interface, and travel back to the ...
Accurately detecting the top of a coal seam before blasting is a key factor to effectual coal recovery. Depending on local site geology and seam conditions, up to 12% of the marketable coal resource is estimated to be unrecoverable due to coal loss and dilution during the mining process.
Goaf badly affects coal mine production safety; therefore, accurate geophysical exploration method to ascertain the goaf is urgently needed. Channel wave seismic technology is suitable for coal mine goaf detection because it has many advantages, such as long transmission distance, high resolution.
SURFACE GEOPHYSICAL METHODS FOR DETECTION OF UNDERGROUND MINE WORKINGS By William J. Johnson and Robert E. Snow – D'Appolonia, Monroeville, PA John C. Clark – Bay Geophysical Associates, Traverse City, MI Abstract Efforts to delineate underground mine workings in the vicinity of tailings impoundments has
A Guide for Applying Geophysics to Coal Mining Problems in South Africa ... • There is no universal geophysical method that can solve all mining problems. ... a method for detecting faults in ...
The geophysical technologies demonstration at the site has verified the effectiveness of the.. RVSPRVSP When Complemented by Sonar or Laser Mapping Combined with Engineering Practices – the most viable geophysical method to. Accurately and Economically Detect Mine Voids ¾Conclusions and Recommendations
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