Coal Operators' Conference Faculty of Engineering and Information Sciences 2006 Airborne Geophysical Techniques M. Armstrong Illawarra Coal, BHP Billiton A. Rodeghiero Illawarra Coal, BHP Billiton Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library:
The mine design production capacity of 0.6 Mt/a. strike long wall coalmining method. What is a single coal bed without parting, distribution of coal was to the west andmostly flat terrain exploration area, wellhead elevation+194.4m, the current mining levelelevation-258.9m, geophysical area 5.6km2.By underground mining impact and local surfacesubsidence.
This project investigated three geophysical methods of detecting underground mines or tunnels. The three methods are magnetic, seismic, and radioactive decay (of radon). The magnetic method aims to detect mines from the magnetic anomalies generated by
Applications of Microgravity. With the increase in demand for the redevelopment of brown field sites, the determination and location of subsurface features is of considerable importance. Microgravity can and has been applied in the detection of such features (usually combined with other geophysical methods).
Use of geophysical methods in construction proceedings of sessions of Geo-Denver 2000 : August 5-8, 2000, Denver, Colorado / Bibliographic Details; Detection of Coal Mines Using Apparent Conductivity -- Characterization of a Reclaimed Site and Its Seismic Vertical Amplification
coal in those panels. Early detection of geologic anomalies can aid in the development and coal extraction of longwall panels. One of the more promising methods of investigating coal seam geologic anomalies is the Radio Imaging Method (RIM). RIM is a geophysical technique that uses electromagnetic waves in the radio frequency range.
Gravity and magnetic geophysical methods are passive. They rely on no controlled sources but seek out naturally occurring variations in the earth's gravity and magnetic fields. For this reason, some military uses of these surveys have long included quiet detection of submarines and
Aeromagnetic and Surface Seismic Surveys for Dike Detection in Illinois Coal Seams, Saline County, Illinois. We conducted tests integrating two high-resolution geophysical techniques in an effort to detect the dikes and map their locations. First, we acquired high-resolution magnetic data in the area where we suspected the dikes to be present.
Mining techniques / Coal extraction methods Due to different geological formations different techniques were developed and improved to extract coal. From the earliest bell pit method to modern drift, opencast, and deep mining extraction methods .
geophysical methods used in search of minerals, groundwater and geothermal resources A layman's summary Geophysical techniques are routinely used in exploration programs to help delineate and map areas favorable for the target being pursued, determine or rule out drill locations, and maximize extraction over the lifetime of a mining or development project.
CT technology with DC electricity is used to analyze two-dimensional point source current field by employing the forward calculation, inverse iteration, model correction and other methods. On the basis, inverted resistivity image of the detecting zone is obtained, which can help to determine damage law and damage depth of coal seam floor.
Many U.S. coal beds are very near the ground's surface, and about two-thirds of coal production comes from surface mines. Modern mining methods allow us to easily reach most of our coal reserves. Due to growth in surface mining and improved mining technology, the amount of coal produced by one miner in one hour has more than tripled since 1978.
Application of Geophysical Methods in Detecting Coal Mined-out Areas Li Juanjuan1,Pan Dongming1,Hu Mingshun1,Zhang Weiqiang2(1.The School of Resourcse and Earth Science,China University of Mining and Technology,Xuzhou 221008,China;2.Geophysical Exploration Team Bureau of Coal Geology of Shandong Province,Taian 271021,China)
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
Coal mining methods . There are two methods used to extract coal from the abyss of the earth or the surface of the earth. The two methods are pretty self explanatory. Surface mining is in reference to the coal deposits being closer to the surface. While underground mining means, It's tunneled for rather then more or less scraped off the top
Coal Industry Basics . 1-Day Training Course: THE Essential Overview of Coal. As a newcomer to the coal industry, build your confidence understanding of its basic concepts, methods technical language, spanning exploration, geology, mining methods, production industry issues
Mar 07, 2018The Guardian NG from Edinburgh Sensors. Designed as an easy-to-use, standalone gas sensor, the Guardian NG series can constantly monitor and log methane concentrations in situations where the gas is present between 0 and volume, with the most sensitive sensor capable of detecting leaks between 0 and 1%.
AP11374 -7- ------- SECTION IV SELECTION OF TECHNIQUES The primary objective of the research program was the application of existing geophysical methods and techniques to the detection and de- lineation of abandoned, underground coal mines and associated water
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 obtain
We have developed a novel method to detect and locate geophysical events that makes use of any sufficiently dense sensor network. This method is demonstrated using acoustic sensor data collected in 2013 at the USArray Transportable Array (TA).
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. This research was financially supported by the Chinese Academy of Sciences (KZCX2-EW-107) and National Natural Science Foundation of China (Grants No. 40874025) to P. Xu.
Geophysical Exploration is an applied branch of geophysics that uses physical methods to measure the physical properties of the subsurface, along with the abnormalities in those properties at the surface of the earth. It is commonly used to detect the presence and position of geological deposits that could be economically used.
Geophysical methods • Passive: Method using the natural fields of the Earth, e.g. gravity and magnetic • Active: Method that requires the input of artificially generated energy, e.g. seismic reflection • The objective of geophysics is to locate or detect the presence of subsurface structures or bodies and determine their size, shape,
A bstract. Three-component seismic and geoelectrical in-mine surveys were carried out in Lyukobanya colliery near Miskolc, Hungary to determine the in situ petrophysical parameter distributions and to detect inhomogeneities in the coal seam. The seismic measurements comprise an underground vertical seismic profile, using body waves,
Mar 01, 2019The accurate and effective detection of underground goafs and their water abundance is the key to ensure the safety of mine production. On the basis of the relevant research, this paper defines different goaf types from the perspective of geophysical exploration and discusses the geophysical prerequisites for goaf detection.
Ground-penetrating radar is the most rapid and cost-effective method for collection of subsurface data in areas associated with voids under roadways. Electrical resistivity, gravity, or seismic reflection methods have applications for direct delineation of voids, but data-collection and
Unknown mines can also present a threat to structures, such as waste disposal impoundments. The mining industry must address the serious safety concerns associated with abandoned mines using a variety of methods and techniques. This PIB is intended to increase industry awareness of additional methods for detecting adjacent mine workings and voids.
Traditionally, airborne geophysical surveys have been used for the detection of conductive ore bodies and geologic mapping. However, in recent years, studies have demonstrated the effectiveness of airborne geophysics and remote sensing for environmental purposes. King and Hynes (1994) used geophysical methods to monitor acid mine drainage at
The paper presents selected results of geophysical surveys carried out in the "Polkowice-Sieroszowice" copper mine in Lower Silesia, Poland. The aim of complex geophysical measurements was the analysis of the usefulness of selected electromagnetic methods for
Environmental Geophysics. Rarely, are geophysical methods capable of direct detection of the contaminants; however, free product in the form of LNAPL or DNAPL can sometimes be imaged with the right subsurface conditions and the right application of
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