Initially a coal seam can be core-drilled and the core recovered for study. After a hole is drilled and the core is recovered, the hole is geophysically logged using a gamma/gamma (slim density) geophysical tool. This geophysical tool is small enough to be lowered down the center of the drill rods.
GEOLOGY Vol. V Coal Exploration and Mining Geology - Colin R. Ward Encyclopedia of Life Support Systems (EOLSS) Coal exploration programs typically involve the following components Obtain legal title to explore the area Evaluate the geological
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
Geophysical methods have been used for many years in the search for metallic ore bodies and petroleum fields, and are also useful at different scales in many coal exploration programs. If the coal basin is underlain by rocks that are denser than or have different magnetic properties from those associated with the coal seams, maps showing the pattern of variation across the area in the earths
Geophysical methods now play a critical role in many coalfield investigations .The techniques used at an early stage in the exploration program are normally those that give broad-scale information on a large area at relatively little cost.
In fact, near-surface gamma ray logs of cased oil and gas wells are a prime source of data for identifying and measuring the thickness of shallow coal beds in the Northern Great Plains region. The gamma ray logs can detect shale partings in a coal bed, but generally the thickness of thin partings is exaggerated.
ISBN0-86499-863-5 Pub.No.T/254 Disclaimer Thecontentsofthispublicationarebasedonthe informationanddataobtainedfrom,andtheresults andconclusionsof ...
Coal exploration projects are focused to accurately predict the geology of a coal field in a cost-effective manner. More geologic data gene rally yields a better geological model of the coal field. Advances in geophysical methods may provide tools to supplement traditional methods of coal exploration.
Geophysical method of exploration of coal Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Geophysical method of exploration of coal, quarry, aggregate, and different kinds of minerals.
Jul 30, 2013 Despite this favourable situation for geophysics, exploration for coal in many countries mainly relies on drilling. The main reason for this is that when compared to petroleum exploration, coal exploration is concerned with much shallower targets (typically less than 2300 m for open pit mining and less than about 1000 m for underground mining).
Advances in geophysical methods may provide tools to supplement traditional methods of coal exploration. Two seismic methods 1) multi-channel analysis of surface waves (MASW), and 2) shear wave (SH-wave) analysis were evaluated to determine their usefulness as coal exploration tools.
Geophysical and remote sensing technologies have become essential to the discovery and assessment of gold and silver, base metal, coal and uranium, and strategic mineral deposits. Airborne geophysical methods are employed to map large areas and increase the efficiency and success of the exploration program. Ground and borehole geophysical methods are deployed to map the subsurface geology
Geophysics applicability matrix for pertinent coal mining and exploration problems Exploitable property Typical required Typical required Most applicable Workable survey contrast range resolution geophysical methods geometry Delineation of old workings Air-filled density, 050 m Accuracy 5 m TDEM Grid surveys on surface
There are several surface geophysical methods that are applicable to detect subsurface ... ies are more expensive than the deep surveys conducted for oil and gas exploration be-cause of the need to make closely spaced measurements. ... 1000 feet and it is difficult and expensive to characterize a coal seam with borings. The method has also been ...
Integration of Downhole Geophysical and Lithological Data from Coal Exploration Drill Holes . Brett J Larkin . GeoCheck Pty. Ltd. Forresters Beach, NSW, Australia . brettgeocheck.com.au . SUMMARY. The primary variable of interest in a coal resource study is the volume of coal as estimated from the coal thicknesses in eac. h drill. hole.
Geophysical Methods Applications SubSurface Surveys Associates, Inc., established in 1988, specializes in near-surface geophysics and utility locating services and is dedicated to establishing strong client relationships. SubSurface Surveys extensive education and experience
carbonaceous material such as coal (Figure 7). ... R.E., 1991. Encyclopedic Dictionary of Exploration Geophysics, Society of Exploration ... Geophysical methods also have the potential to map this ...
There are many ways to derive coal quality parameters from geophysical logs. A common method is to establish the relationships between laboratory derived proximate analysis and multiple geophysical logging parameters so that future coal parameters can be directly estimated from the geophysical logging measurements through established relationships.
AGS can provide a number of surveys for the geothermal, coal and gas industries such as surface TEM, Magnetotelluric and resistivity surveys. Information on Geophysical Methods Active member of
Mining and Mineral Exploration. Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an ore body, lode, vein, seam, reef or placer deposit. These deposits form a mineralized package that is of economic interest to the miner. Non-invasive geophysical methods such as seismic reflection and ...
articleosti_5382423, title Geophysical applications in coal exploration and mine planning electromagnetics, author Bartel, L C and Dobecki, T L, abstractNote Geologic features such as structure (faults, folds, fractures, etc.), water bearing zones, aquifers, permeability variations, and porosity variations are important for mine planning and in situ energy recovery processes.
The focus of these coal exploration projects are to accurately and cost effectively predict the geology of a coal field. More geologic data generally yield a better geological model of the coal field. Advances in geophysical methods may provide tools to supplement the traditional methods of coal exploration.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda) Coal exploration projects are focused to accurately predict the geology of a coal field in a cost-effective manner. More geologic data generally yields a better geological model of the coal field. Advances in geophysical methods may provide tools to supplement traditional methods of coal exploration.
Jun 12, 2017 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,
exploration techniques. The survey in no way will replace good drilling information or detailed geologic mapping. Combined with these and other exploration methods it is a way for us to provide our clients with accurate reserve numbers in a timely manner. At this time I wish to thank Energy Fuels Coal, Inc. and Geophysics International for their
SURFACE GEOPHYSICAL INVESTIGATIONS Introduction Surface geophysical surveys have been applied to mineral and petroleum exploration for many years. A magnetic compass was used in Sweden in the mid-1600s to find iron ore deposits. The lateral extent of the Comstock ore body was mapped using self-potential methods in the 1880s. A
Coal reserves are discovered through exploration. Modern coal exploration typically involves extensive use of geophysical surveys, including 3D seismic surveys aimed at providing detailed information on the structures with the potential to affect longwall operations, and drilling to
Coal is a low-cost commodity and coal miners profit margins are slim, such that mining companies must maintain tight cost control to achieve acceptable returns. The challenge to coal geophysics is to adapt to these economic constraints and provide cost-effective, reliable methods for exploration and mining requirements. The geophysical methods which have been used in the reconnaissance, pre ...
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.
GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ENVIRONMENTAL INVESTIGATIONS by Donald B. Hoover, Douglas P. Klein, and David C. Campbell INTRODUCTION In the following discussion, the applicability of geophysical methods to geoenvironmental studies of
Mine geophysical prospecting is an important means for geological exploration of coal seam working faces, among which the mine radio wave tomography is one of the most common and effective methods.
Geophysical logs can be used not only for qualitative interpretation such as strata correlation but also for geotechnical assessment through quantitative data analysis. In an emerging digital mining age, such a use of geophysical logs helps to establish reliable geological and geotechnical models, which reduces safety and financial risks due to geological and geotechnical uncertainty for new ...
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.
Feb 23, 2012 Airborne geophysical methods for mineral exploration are means to collect geophysical data that can be used to prospect directly or indirectly for economic minerals that are characterized by anomalous magnetic, conductive or radiometric responses.
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 ...
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