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Implementation of Paste Backfill Mining Technology in Chinese Coal ...

Jul 31, 2014 ... From the perspective of mining design, processing and usage of coal resources, ... To resolve these environmental problems induced by mining activities, ... New clean mining technology, techniques, and equipment are .... slurry in the surge hopper enters the backfilling pump cavity, relying on self gravity.

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Glossary of Mining Terms Kentucky Coal Education

Back The roof or upper part in any underground mining cavity. .... Canopy A protective covering of a cab on a mining machine. ... The 1990 amendments broadened and strengthened the original law to address specific problems such as acid ... work of preparing the coal so extracted, including coal preparation facilities.

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Selected Problems in Designing and Constructing Surface Mining ...

Faculty of Mechanical Engineering. Selected Problems in Designing and. Constructing Surface Mining. Machinery. Contemporary machine design not only...

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Roof Instability NCBI NIH

Since then, the design of bolts, grout systems, accessories and installation techniques ... Coal mine operators must report two types of roof falls to MSHA: 1) falls ... of roof fall cavities, and the distribution of roof falls in different coalbeds and mining ..... Molinda (2003) reported occurrences of roof problems due to clay veins in...

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Ground Failures in Coal Mines with Weak Roof CDC

stability model which can then be used to design mine openings and prescribe roof support. These ... An investigation of roof falls (rock pile and cavity) and adjacent entries may reveal clues to the ... Six of the mines visited reported problems with stackrock in the roof. Three of ...... The use of miner bolter machines may help.

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Longwall mining Wikipedia

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a ... The only other machinery used was an electric cutter to undercut the coal face and ... The layout of Longwall could be either 'advancing' type or of 'retreat' type. In the ... The cavity behind the longwall is called the goaf, goff or gob.

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Some Challenges of Deep Mining ScienceDirect

Mining engineering has relied heavily on empirical procedures in design for ... Minerals also provide the mechanized equipment, fertilizers, and pesticides that are ..... The use of a burn cut, in which a central cavity is developed, usually by...

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Land subsidence risk assessment and protection in mined ... PIAHS

Nov 12, 2015 ... Land subsidence due to underground mining is an important hazard that causes large damages and threatens to social ... the project plan has not completely solved these problems. ... mined out cavities within less than 300 m depth below land ... vector machine theory (Li et al., 2008), and the thin layer.

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Chapter 8 Mine Safety and Health Administration MSHA

May 2, 2009 ... This chapter focuses on coal refuse impoundment design issues caused ... 2003 MSHA report for guidance related to underground mine issues. .... control points is then a function of the equipment or method used to ...... Incomplete filling of surface cavities and depressions in rock surfaces with compacted.

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The application of geophysics in South African coal mining and ...

vol.114 issue10 · Design and positive financial impact of crush pillars on ... Near surface cavity detection and evaluation of surface depressions ... material, such as dolerite, which presents a great challenge for mining machines and can ... This problem occurs only where opencast mining activities are conducted in an area...

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