ISBN0-86499-863-5 Pub.No.T254 Disclaimer Thecontentsofthispublicationarebasedonthe informationanddataobtainedfrom,andtheresults andconclusionsof ...
The company is planning to conduct further exploration to measure additional coal reserves. Reserves. Initial exploration in 2007 revealed that about 156.2ha of the mine area contained 460mt of coal reserves. About 181mt of these reserves is premium coking coal. Further analysis revealed that the mine has about 149mt of joint ore reserves ...
We have come so far with exploration methods in the last 100 years. Cable-tool drilling was an economical breakthrough over exploratory shafts and drifts. Rotary drilling using water or drilling mud was of great benefit to the exploration budget. Portable air compressor packages opened other drilling doors. In recent decades geophysical logging,
Sep 01, 2009 In the stage of coal geological exploration, the method of packing and sealing is often adopted to measure gas pressure in prospecting boreholes 3. Bright spots of seismic exploration relative amplitude-preserve are also a reflection of high content of coalbed gas. Peng Su-ping 2006 attempted to detect adsorbed gas using AVO technology ...
With coal, only a certain percentage of the holes drilled into a deposit need to be cored and assayed. The rest need only to be drilled and geophysically logged. Accurate coal quality determinations for mining purposes can be determined from the geophysical logs once
Jul 22, 2020 The mining work in high-density coal mining areas has gradually extended to deep strata, and 3D seismic exploration technology plays a key role in the exploration of deep coal resources. Collecting high-quality 3D seismic exploration signals is the prerequisite for
Sep 24, 2015 Although drilling and exploration are not performed during the CBM target selection phase, the amount of CBM resources can still be inferred from geological parameters obtained from coal mine exploration data, such as the coals rank, thickness, depth, pressure, and gas content Zhang et al. 2002 Liu et al. 2001, and the amount of recoverable resources can be determined using geological
Advances in geophysical methods may provide tools to supplement the traditional methods of coal exploration. In this study, two seismic methods, multi-channel analysis of surface waves MASW and shear wave SH-wave analysis, were evaluated to determine their usefulness as coal exploration tools.
miscetde6273902, title Coal petrology - its principles, methods, and applications author Bustin, R M, Cameron, A R, Grieve, D A, and Kalkreuth, W D abstractNote This book consists of short course notes designed for participants of the 1983 Geological Association of Canada Annual Meeting held in Victoria, British Columbia, May 8-10 1983. . After a brief introduction and historical ...
Mud-rotary drilling this method is used for drilling through soft rocks, sand and clay layers especially in the search for coal, oil or gas. A special mix of clay and water is forced down the drill hole turning a rotary bit, with rock chips returning in the mud slurry.
A suite of logs run in a coal exploratory drill hole at slow speeds of 15 feet or less per minute and recorded at 1 inch equals 10 feet or less, with a standard mineral probe and recording instruments set for coal identification, can measure coal beds as thin as -0.5 foot.
The efficient mining of hard coal in deep coal mines using highly mechanized longwall techniques requires information on the geological structure ahead of the operating face. Even minor tectonic
The application of in seam seismic methods for coal seam exploration in connection with longwall mining is evaluated. The present exploration practice is reviewed. With the introduction of the relatively expensive high production longwall mining technique, in seam seismic methods are important to successful mining operations.
With reflection method one can locate and map such features as anticlines, faults, salt domes and reefs. Many of these are associated with the accumulation of oil and gas. Seismic refraction method In refraction method, the detecting instruments recorded the arrival times of the seismic waves when refracted from the surface of discontinuity.
Borehole logging is the one method which is highly utilised for both surface and underground coal mining exploration, although seismic methods mainly high-resolution reflection, and in-seam, are also frequently applied in underground coal-mining investigations.
First, we collected a large number of coal and noncoal samples such as sandstones, shales, and coal gangues. Second, we measured the actual spectral data of these samples using a spectrometer. For coal mines, we used the chemical analysis method to quantify coals fixed carbon and categorize the coal mines into three types based on the fixed carbon content present in coal.
At present, many geophysical methods have been adopted to prospect coal mining goaf. However, each method has its own disadvantage which limits thevalidityforprospecting coal mining goafs, particularly for multilayer goafs. In this paper, a borehole electromagnetic
Mineral and coal exploration guideline Department of Resources March 2021, Version 6.04. 1 . Mineral and coal exploration guideline . The department has developed a series of guidelines to assist existing and prospective resource authority holders understand the legislation around the issue or resource
The goal of mineral and coal exploration is to locate large, high-grade reserves with minimal disturbance to the ground and the environment. Technological advances, including GPS surveying, airborne technologies and down-hole seismic imaging, have enabled companies to locate new deposits previously beyond discovery using traditional methods.
This method is used in soft rock materials to about 25m deep, or to drill through the top layer of decomposed rock and soil to get a fresh rock sample from the bedrock below. Air-percussion drilling this method is used for penetrating hard rock types to a depth of around 300m. Rather than a rotating bit, a hammer bit is forced through the rock by compressed air.
Jun 18, 2012 precision 3D seismic exploration in 2007. By using the multi-attribute analysis method, we achieved a very good result in identifying the minor faults with throws of 2-3 meters. After about four years of coal mining, the predicted faults with high-precision 3D seismic data have been verified in the actual coal mining operations.
The measurement of thickness of coal beds on geophysical logs requires the identification of the top and base of the coal beds by either of the following methods 1 point of inflection method the points where curves change direction, or 2 midpoints of inflection method arbitrary points located midway between the points of inflection.
Ex situ coal sampling is carried out on moving streams of coal, from rail wagons, trucks, barges, grabs or conveyors unloading ships, from the holds of ships and from coal stockpiles.
How is coal seam gas extracted Coal seam gas is extracted by drilling a well vertically through rock strata until reaching the coal seam, at which point the well may also be drilled out horizontally to increase access to the methane gas. Coal seams contain both water and gas.