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geophysical methode for detecting coal

GEOPHYSICAL METHODS FOR COAL FIRE

01-12-2009  It is known that the heating of coal resp. coal host rocks changes its electrical resistivity and magnetic susceptibility. Hence the methods of choice are airborne magnetics and frequency electromagnetics (AEM) for surveying large and inaccessible areas and ground based magnetics, transient electromagnetics (TEM), ground penetrating radar (GPR) and temperature measurements to

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Overview on the application of geophysics in coal

30-07-2013  Since their introduction to the coal mining industries of the United Kingdom and West Germany in the 1970s, geophysical methods are now utilised in coal mining around the world. The range of applications in both surface and underground mining is extensive. Applications include coal seam mapping and geological fault detection, lithological mapping, ...

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SURFACE GEOPHYSICAL METHODS FOR DETECTION OF

the electrical resistance. Mine voids in coal mines are usually encountered as resistiv-ity lows because of the presence of acidic mine water. Other Methods, such as magnetics and ground penetrating radar have been used for detecting subsurface cavities, but can be subject to precision, interference, or depth

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(PDF) A Guide for Applying Geophysics to Coal

Geophysical methods, including gravity, electrical resistivity, ground penetrating (GPR), and airborne thermal imaging methods (e.g. Breytenbach and Bosch 2011;Van Schoor 2002; Van Schoor and ...

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Geophysical Methods, Exploration Geophysics »

02-04-2019  The method involves the propagation of time varying, low frequency electromagnetic fields in and over the earth. An alternating voltage is introduced into the earth by induction from transmitting coils and the amplitude and phase shift of the induced potential generated in the subsurface are measured by detecting coils and recorded.

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Geophysical Method - an overview ScienceDirect

IV.B Geophysical Exploration. Geophysical methods have been used for many years in the search for metallic ore bodies and petroleum fields and are increasingly being applied to coal exploration

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Surface Geophysical Methods SpringerLink

Geophysical technologies for detecting underground coal mine voids form, 28–30 July 2003, Lexington, KY Google Scholar Reynolds JM (2011) An introduction to applied and environmental geophysics. Wiley, New York Google Scholar

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GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ...

Some geophysical methods, such as gamma-ray spectrometry and remote sensing, measure surface attributes; others, such as thermal and some electrical methods are limited to detecting relatively shallow features but may help identify features at greater depth. Secondary effects of deeper features, ...

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Geophysical Methods Applications

Subsurface Surveys, an applied geophysics company, uses a variety of geophysical methods to solve engineering, geological, environmental and forensic problems. The methods and instruments we use are chosen to meet the specific needs of our clients and accommodate the existing field conditions. Geophysical Areas Covered • Seismic Refraction

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Keys to Successfully Using Geophysics to Detect Mine Voids ...

Geophysical Methods for Void Detection Electromagnetics (EM) Radio Detection Magnetics Very Low Frequency EM (VLF) Ground Penetrating Radar (GPR) Electrical Resistivity Imaging (ERI) Induced Polarization (IP) Spontaneous Potential (SP) Liner Leak Detection (LLD) Seismic Refraction / Reflection / Crosshole Surface Wave Methods

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GEOPHYSICAL METHODS FOR COAL FIRE

GEOPHYSICAL METHODS FOR COAL FIRE DETECTION AND ... of coal fires in Northern China" a number of different geophysical methods have been applied to determine their use on coal fire detecting

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geophysical methode for detecting coal

geophysical methode for detecting coal; Overview on the application of geophysics in coal mining ... The range of techniques that can be employed is also extensive and includes geophysical borehole logging, the potential field methods, seismic reflection (2D and 3D), resistivity, electromagnetics and microseismic monitoring using active and passive sources.

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GEOPHYSICAL VOID DETECTION DEMONSTRATIONS

geophysical technologies for detecting mine voids To ... – Known abandoned coal mine adjacent to an active UG room-and-pillar mine, Georgetown, IL. 8 ¾Geophysical Methods – An Overview ... Performance Evaluation of Geophysical Methods. 27 Have these geophysical technologies met

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A New Method for Detecting Goaf Area of Coal

A goaf area is referred to as a cavity where coal has been removed or mined out. These cavities will change the original geostress equilibrium of stratigraphic system and cause local geostress focusing or concentration. Consequently, the surrounding rock of a goaf may be deformed, fractured, displaced and caved resulting from the combined effect of gravity and geostress.

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Review of geophysical prospecting application of

Yang J M, Wei Z Z, Gao X W. 2014. The application of the methods of high density resistivity method and transient electromagnetic to detecting coal mining goaf and to inspect grouting effect [J]. Progress in Geophysics, 29 (1): 362–369, doi: 10. 6038/pg20140151 (in Chinese). Zhang J Q, Zhang Q L, Tang Y

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Surface Geophysical Methods SpringerLink

Geophysical technologies for detecting underground coal mine voids form, 28–30 July 2003, Lexington, KY Google Scholar Reynolds JM (2011) An introduction to applied and environmental geophysics. Wiley, New York Google Scholar

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GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ...

Some geophysical methods, such as gamma-ray spectrometry and remote sensing, measure surface attributes; others, such as thermal and some electrical methods are limited to detecting relatively shallow features but may help identify features at greater depth. Secondary effects of deeper features, ...

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Methods of fault detection with geophysical data

The more information, the better. All these methods are mutually complementary. Potential-field geophysical methods for fault detection. Gravity and magnetic methods are of great value in the detection of faults and fractures. In the mining industry, potential-field methods are used for this purpose very commonly on a prospect scale.

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Geophysical Method - an overview ScienceDirect

Geophysical methods are indispensable for the recognition and interpretation of structures in Earth's crust and mantle. Among the numerous geophysical methods suitable to explore structure and composition of the lithosphere, seismic techniques provide the best tools for detailed crustal and upper mantle investigations (see SEISMIC SURVEYS).In explosion seismology, the use of deeply, nearly ...

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Geophysical Methods to Detect Stress in Underground Mines

GEOPHYSICAL METHODS TO DETECT STRESS IN UNDERGROUND MINES . By Douglas F. Scott, 1. 1. Geologist, Spokane Research Laboratory, National Institute for

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A Review of Geophysical Exploration Technology

Geophysical exploration can be effective in detecting and monitoring potential sources of coal mine water in-rushes and underground watercourses. Generally, in-mine seismic, DC resistivity, and transient electromagnetic methods are used for such purposes in China. However, such technologies can be influenced by many factors, such as roadways, fissures in the surrounding rocks, and various ...

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Application of In-mine Geoelectric Methods for Detecting ...

However, there are geophysical methods for which the necessary measurements are carried out within the mine, and by which even smaller disturbances of the coal series can be detected: the in-seam seismic reflection and transmission methods (Krey, Arnetzl and Knecht 1982) and in-mine geoelectric methods (Csókás et al., 1986)

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Detecting top of coal - Mining3

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.

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Coal Exploration and Geophysical Logging, with

Coal seams can also be evaluated insitu by geophysical means for their coalbed methane content. All of this work can be accomplished by geophysical tools that run inside the drilling rods. page 3. In-situ Coal Deposit Evaluation Methods. Coal deposits occur in sedimentary strata that have some lateral extent.

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Geophysical Technologies to Image Old Mine

Thus, there is a need to utilize geophysical imaging technologies to accurately locate old mine works. Several surface and borehole geophysical imaging methods and mapping techniques were employed at a known abandoned coal mine in eastern Illinois to investigate which method best map the location and extent of old works.

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GEOPHYSICAL VOID DETECTION DEMONSTRATIONS

geophysical technologies for detecting mine voids To ... – Known abandoned coal mine adjacent to an active UG room-and-pillar mine, Georgetown, IL. 8 ¾Geophysical Methods – An Overview ... Performance Evaluation of Geophysical Methods. 27 Have these geophysical technologies met

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Geophysical Intrument For Coal Mine

Geophysical technologies for detecting underground coal mine voids lexington ky july 2830 2003 applications of the electrical resistivity method for detection of underground mine workings by william j johnson dappolonia monroeville pa introduction the need to understand the location of abandoned workings has recently been high. Online Chat

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Exploration geophysics - SEG Wiki

Electric-resistance methods such as induced polarization methods can be useful for directly detecting sulfide bodies, coal and resistive rocks such as salt and carbonates. The data collected from every source is processed and bring into intelligence for further analysis. This helps in rig monitoring and prescriptive analysis.

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(PDF) GEOPHYSICAL TECHNIQUES AND THEIR

Table 1: Classification of geophysical techniques as per signal generation Classifi Method Principle Depth of Survey Source cation penetration method Passive Magnetic Measures variation in 0-20 km Ground, sea, (Kamil, 2008; susceptibility of (ground data usually airborne Reynolds, mineral deposits gives lower depth) 1997) Gravity Measures density Entire earth (ground Ground, sea, (Kamil, 2008 ...

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Use of an automatic resistivity system for

@article{osti_6287233, title = {Use of an automatic resistivity system for detecting abandoned mine workings}, author = {Peters, W R and Burdick, R G}, abstractNote = {A high-resolution earth resistivity system has been designed and constructed for use as a means of detecting abandoned coal mine workings. The automatic pole-dipole earth resistivity technique has already been applied to the ...

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Geophysical Intrument For Coal Mine

Jul 30 2013 since their introduction to the coal mining industries of the united kingdom and west germany in the 1970s geophysical methods are now utilised in coal mining around the world the range of applications in both surface and underground mining is extensive applications include coal seam mapping and geological fault detection lithological

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Application of In-mine Geoelectric Methods for Detecting ...

However, there are geophysical methods for which the necessary measurements are carried out within the mine, and by which even smaller disturbances of the coal series can be detected: the in-seam seismic reflection and transmission methods (Krey, Arnetzl and Knecht 1982) and in-mine geoelectric methods (Csókás et al., 1986)

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Detection and delineation of coal mine fire in Jharia coal ...

geophysical methods were used to detect the surface and subsurface coal mine fires. Geophysical techniques used in the present study are apparent resistivity, self-potential (SP), magnetic method and thermography. Geophysical anomalies such as low SP value of −60 mV, high negative magnetic response and low apparent resistivity value helped us to detect and delineate the fire and non-fire

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Geophysical and Image Processing Methods for

(1989). Geophysical and Image Processing Methods for Detection of Fireholes in Brown Coal, Latrobe Valley. Exploration Geophysics: Vol. 20, No. 1-2, pp. 153-158.

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Coal Exploration and Geophysical Logging, with

The other kind of insitu analysis program that can be run during a coal exploration program is one for insitu coalbed methane (CBM). This is done using a "Quad Neutron" geophysical tool. All coal deposits contain coalbed methane. This tool can detect the insitu potential for coalbed methane in the coal and/or the sedimentary strata enclosing the coal.

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Geophysical Void Detection Demonstrations

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

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(PDF) GEOPHYSICAL TECHNIQUES AND THEIR

Magnetic technique is the most commonly used geophysical tool in gold exploration, as it is in exploration for other metals (Doyle, 1990). Successful use of magnetic technique for gold exploration in South Africa and Canada was reported by (Hugh, 1990). Magnetic method has been used in coal

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REVIEW: GEOPHYSICAL METHODS FOR DETECTION AND

Fmre 1 Shallow seismic reflection section showing bedrock surface anddissolution features associated with mapped faults (from Dobeck et al.. 1989). bireftinsence (splittins into fast and slow components) which ate 1) shallow, 2) large and3) air-fined The first two when such a wave passes through a fractured rock mass points are valid for any geophysical method; the latter is

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Use of an automatic resistivity system for

A high-resolution earth resistivity system has been designed and constructed for use as a means of detecting abandoned coal mine workings. The automatic pole-dipole earth resistivity technique has already been applied to the detection of subsurface voids for military applications.

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Exploration geophysics - SEG Wiki

Geophysical methods. The main techniques used are: Seismic methods, such as reflection seismology, seismic refraction, and seismic tomography. Geodesy and gravity techniques, including gravity gradiometry. Magnetic techniques, including aeromagnetic surveys. Electrical techniques, including electrical resistivity tomography and induced polarization.

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