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Apr 26, 2012· The Use of Geophysical Methods to Detect Abandoned Mine Workings. Prior to the mid 1900s, significant coal mining was conducted in the Front Range of Colorado. Most of the mines extracted coal from relatively thin seams located at shallow depths using room and pillar mining techniques. Subsequent to mine abandonment, the remaining coal pillars ...
A gamma ray log is the most versatile of the geophysical logs for the following reasons: (1) it does not require fluid in the hole; (2) it is not sensitive to small variations in hole diameter; and (3) it can be used to detect coal beds through well casing. In fact, near-surface gamma ray logs of cased oil and gas wells are a prime source of ...
Geophysical and image processing methods for detection of fireholes in brown coal, Latrobe Valley G.R. Pettifer, N. Djordjevic, D. Heislers, J. Schaeffer and J.A. Withers Exploration Geophysics 20(2) 153 …
Jan 01, 2019· Then, the borehole detection method is used to verify the goaf range obtained from comprehensive geophysical prospecting, and the results show good consistency. In addition, based on the results of borehole exploration and the comprehensive analysis of the borehole image, the instantaneous water level elevation in goaf and the development ...
In order to realize fine comprehensive geophysical detection for coal mine goafs,based on the analysis of type classification,characteristic and applicabl e conditions of the mature surface geophysical methods,comprehensive geophysical cases,the optimization of surface comprehensive geophysical methods was carried out.The results showed that in order to achieve accurate comprehensive surface ...
Sep 24, 2021· A coal mine in Datong is an integrated mine. At present, there is goaf in the upper and lower part of the mining coal seam. There is a lot of ponding in the goaf, which has great potential safety hazards for production. In order to find out the scope and location of ponding in goaf, the comprehensive geophysical exploration method combining transient electromagnetic method and high-density ...
Dec 31, 2015· The geophysical characteristics of coal and rock (such as magnetic susceptibility, remanent magnetization, self-potential and resistivity) in coal-fire areas will be changed dramatically at high temperature, which constitutes the foundation of corresponding geophysical methods to …
Abandoned mines are often difficult to locate. Detailed mine maps may be unreliable or missing. Conventional exploration (drilling) can easily miss targets as small as a mine entry. Nevertheless, geophysical methods are seldom employed to help map abandoned mines, possibly because geophysics surveys are perceived to be too expensive or will not help to solve the problem at hand.
Dec 06, 2018· (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.
Sep 01, 1995· OSTI.GOV Journal Article: Remote detection of underground coal mine fires using geophysical methods Title: Remote detection of underground coal mine fires using geophysical methods Full Record
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.
Historically, geophysical technique (magnetic) was first used in Sweden in the 17th century for prospecting iron ore (Reedman, 1979). Geophysical techniques gained more acceptability in the early 1923 (Gupter, 1986) because of exploration for crude oil. Relevance of Geophysics across the world is as a result of oil and solid mineral exploration.
Aug 08, 2019· 2.2. Geophysical Characteristics. In order to avoid the multisolution of the single geophysical exploration method, improve the accuracy of exploration, and have a qualitative understanding of the geophysical characteristics of the exploration area, the resistivity logging method [24, 25] is used to study the resistivity distribution law of different depth strata in the exploration area.
Geophysical and intrusive site investigations to detect an abandoned coal-mine access shaft, Apedale, Staffordshire, UK ... relict mineshafts by geophysical methods have been successfully ...
Nov 11, 2020· Deep-Mine Void Detection through Electrical Imaging. Electrical imaging can be an effective geophysical method for locating subsurface voids, specifically for deep-mine void detection. Publication Abstract: In the late 1800s, shallow subsurface mining of a local coal bed beneath a 25-foot thick sandstone resulted in mine voids in the Akron.
The invention provides a method for detecting a whole field with an electrical source transient electromagnetic method. The method concretely comprises the following steps of: carrying out deep exploration on a deep geologic target body by adopting a detecting method of an electrical source transient electromagnetic method under the condition of a near field source to obtain observation data ...
Request PDF | Detection of Coal Spontaneous Combustion Using the TEM Method: A Synthetic Study | Spontaneous coal combustion is a serious hazard that affects mining safety. Since the coal seams ...
character of the earth, the geophysical method can be classified into electrical method, magnetic method, seismic method, geothermal method. In fact, there are no differences between common geo-physical methods and coal mining geophysical method in the principle. However, the coal mining geophysical methods are restricted in the coal mining tunnel.
Aug 23, 2019· Detection of water yield property is one of the most important tasks for mine water control. Because of low reliability of a single water detection method, it is necessary to find an effective water detection system. In this study, we established a circulatory system for water detection (CSWD) and analyzed working principles of each module of the system. The system was then tested in a China ...
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
Jul 01, 2018· High-density electrical method is a rapid, economical and efficient method for detecting goaf water in coal mines. In this paper, firstly, the high-density electrical method was used to perform forward and inverse calculations on the numerical model of the old mine goaf, and the characteristics of geoelectric response were analysed. It can provide scientific basis for on-site detection ...
Dec 18, 2018· ABSTRACT Derelict coal mine workings at Apedale in Staffordshire, United Kingdom were the focus for a multi‐disciplinary geophysical and intrusive site investigation. Objectives were to: 1) locate the surface entrance to a coal mine access shaft, 2) determine the inclined shaft's changing depth below present ground level, 3) determine if it was open, partly or fully filled, 4) locate it ...
Jan 15, 2007· 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.
Application of Bore-hole Transient Electromagnetic Method to Advanced Detection of Underground Coal Mine, Coal Geology & Exploration, 2004,32(Suppl.): 98-99 Mine DC Electrical Exploration(in ...
Dec 01, 2009· 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.
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 ...
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 ...
Non-invasive geophysical techniques are excellent tools to detect cavities and voids on different scales and therefore help remediate negative effects caused by such features from the beginning of a project. Electrical resistivity tomography (ERT) is one geophysical method used for …
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.
popular geophysical method [4]–[7] for exploring geological structure in the coal tunnel, it has a blind zone of 20 meters near the transmitter area [8].