geophysical methods led to the discovery of a new localized iron ore deposit in the hilly parts of the area as the source of the magnetite. The study indicates that these deposits are part of a potentially extensive resource. The ore occurs in two forms; fine grained deposits that are mixed with the alluvial

Apr 24, 2019· We propose a method of predicting fractures in a coal seam using multicomponent seismic data, which was applied to coal seam 131 of the Huainan coalfield, China.

A comparison of loop timedomain electromagnetic and shortoffset transient electromagnetic methods for mapping waterenriched zones — A case history in Shaanxi, China Weiying Chen, Guoqiang Xue, Afolagboye Lekan Olatayo, Kang Chen, Muhammad Younis Khan, Weichang Chen, Linbo Zhang, .

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This information was used in combination with the geophysical data, obtained during the current study, to attain results about the state of the ground and to create general implications for the suitability of geophysical investigations of old nearsurface coal mines. The used geophysical methods are the ground penetrating radar (GPR), geoelectric prospection, and seismic refraction.

permeable coal reservoirs, which is very common in anthracite coals. Different from the three methods mentioned above, the geophysical logging method is more economic and convenient. It can measure the coal permeability in arbitrary sites of a coal reservoir around the borehole, but itrequiresa reliablepermeability estimationmodel that

In order to tunnel safely, efficiently and economically, we carried out the study on geostatic stress characters and optimizing bolting support parameters in 2# coalbed of Zijin Colliery. Based on the surveys of geological conditions, original rock stress, broken rock zone measurement and analysis of roadway deformation, characters and mechanism of roadway failure is figured out.

PROCEDURE FOR SAMPLING DRILL CORE. The drill core should be the most representative type of sample of a coal bed. However, in some cases, coal is lost during coring, and the complete bed is not represented by the recovered drill core. In any case, geophysical techniques, such as gamma and gammagamma (density) logs,...

method for deep mineral exploration. The Lalor deposit was chosen as a test site as it provided an intact, wellcharacterized 29 Mt deep ore deposit with a rich catalogue of geological and geophysical data, as well as extensive drillcore, and drill hole geophysical and geological logs that would contribute to .

Approximately 60% of the coal mining works are conducted with a mining depth of over 800 m in China . Mining works in deep strata are facing the challenges of high ground stresses and complex geological conditions . These emerging problems have resulted in large deformation and failures of surrounding rocks and roadway collapse which seriously threaten the safety of miners and limit output capacity of .

seam. This seam is one of the most important strata of coal located near the top of the PennsylvanianPeriod Carbondale Formation and averaged six feet thick at a depth of approximately 235 ft. The abandoned mine operated from 1917 to 1947 and used roomandpillar methods to .

The methods developed can be applied to valleyfill aquifers in the rest of the state. The enhanced bedrock topography data will also provide hydrologists and health department officials with better tools to investigate the geologic constraints on naturally occurring arsenic in groundwater in deep wells.

Nov 27, 2018· Abstract. In order to reveal mining pressure in the workface using a gangue backfilling method and a caving method in Pingdingshan No. 12 coal mine, this paper establishes a numerical analysis model for different advance lengths of workface based on geological conditions.

LANEWAY RESOURCES LIMITED ANNUAL REPORT 2014 6 Geology and Mineralisation The Agate Creek Project is situated within the historic Etheridge Goldfield where gold, silver, copper and lead along with minor amounts of tin, tantalum and niobium have been historically produced from placer and hard rock (mostly vein) sources.

On the basis of core holes described in this study, however, most of the coal beds are less than 2 ft thick. At single localities, multiple coal beds having thicknesses of 1 to 2 ft may provide good targets for development of coalbed methane. A core test drilled by the .

Department of Energy Invests 39 Million to Improve Existing CoalFired Fleet Projects will develop advanced technologies that improve the overall performance, reliability, and flexibility of .

Nov 01, 2018· A causal mechanism for anomalous electromagnetic radiations from coal and rock failure. Dexing Li ... Threedimensional geosteering coherence attributes for deepformation discontinuity detection. ... Nonsplit complexfrequency shifted perfectly matched layer combined with symplectic methods for solving secondorder seismic wave equations ...

Application of seismic methods to a groundwater problem in northeastern Ohio Richard Ellsworth Warrick. Richard Ellsworth Warrick. Search for other works by this author on: GSW. Google Scholar ... Ohio geophysical methods United States. You do not currently have access to this article.

Aiming to prevent serious deformation of a large section roadway along a fault in response to drivage, combined with specific geological conditions and supporting engineering practice of the panel of a coal mine, UDEC polygonal methods are used to compare and analyze the fracture development, stress distribution and deformation of roadway surrounding rocks and the bearing force of the supporting .

Coal and gas outbursts are dominated by ground stress when the depth is more than 750 m, and below 900 m, the coal and gas outburst is combined with rock burst. During the outer section excavation process of the F 15 ‐24080 machine laneway, coal and gas outburst occurred at 38 m before the 8010 position on 2006. 3.

The intensification of mid‐level vortex usually corresponds to the weakening of low‐level vortex except for the deep convection phase. Mid‐level vortex favors convection by enhancing local baroclinity and acting as a pouch in early and late pre‐genesis stage, respectively.

The combined results where used by the client to design a well field to enhance the city water supply. Environmental For the Army Corps of Engineers, developed the exploration strategy and the corresponding work plan for geophysical surveying in a number of abandoned buildings slated for demolition. The buildings were to be razed in place, and the resulting rubble compacted for use as a .

Advanced detection technology was urgently needed because of the frequent happenings of driving working face water inrush,coal and gas outburst accident,etc. The reflection seismic method was an important means of geological structure prediction in mining geology advanced detection. The wave field separation and migration imaging was the key of reflection seismic advanced detection technology.

Designed for both shallow and deep hole drilling, you can deploy the DE712 for a wide range of applications, including mineral exploration, directional drilling and geotechnical drilling.