steep seam coal mining in spain

  • Europe’s coal legacy – in pictures | Environment | The ...

    Sep 07, 2021 · Europe’s coal legacy – in pictures Children play on the beach by Sines coal power plant, Portugal. Since this photo was taken, the

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  • Movement and Protection for Random Shape Rockfalls in ...

    Oct 12, 2021 · While the research on steep seam mining mainly focuses on mining equipment, especially hydraulic supports and shearers [21–30], and technical management of longwall working faces, only few studies have been carried on the motion mechanism of rockfalls in steep seam mining [9, 10]. In 2015, Tu et al. comprehensively review the fully mechanized ...

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  • Probabilistic analysis of subsidence-induced strains at ...

    Oct 01, 2000 · 1.. IntroductionFor many years, the profile function method has been successfully applied to predict subsidence induced by workings in horizontal or moderately dipping coal seams , , , , , , .Even profile functions for the case of steep coal seams have been developed .But subsidence induced by workings in very steep (70–90°) coal seams is so complex that none

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  • Reduced Coal Loss and Dilution - Orica

    Maximising coal recovery in challenging geologies represents a significant efficiency opportunity for most coal mining operations to increase the value of their resource. As the easy coal is mined out, mine operators need to become more skillful at mining thin, steep, deep and undulating seams productively and without sacrificing coal quality.

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  • Underground methods of extraction of thick coal seams—a ...

    Dec 01, 1984 · The state of the art of hydraulic mining in the USSR. Gl~ckauf+Translation 117 (1981) (4) 98-100. 66 L.J. Mills. Hydraulic mining in the USSR. The Mining Engineer (June, 1978) 655-663. 67 V.M. Kolesnikov. Hydraulic mining of the thick and steep coal seam in the Soviet Union. Proc. First Int. Symp. on Thick and Steep Seam Coal Mining.

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  • (PDF) Risk mitigation for rockfall hazards in steeply ...

    ground steep coal seam with a mining height of 4.5 m in Xinjiang Province, north- western China. The mesh parameters were a mesh size of 100 mm 100 mm and a

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  • Final Report - Fatality #5 - May 28, 2015 | Mine Safety ...

    May 28, 2015 · The road provides access from the Lower Alma coal seam level to the Elkhorn No. 2 coal seam level, with an elevation change of approximately 120 feet. This was the last steep section of road just prior to reaching the level area on the Elkhorn No. 2 seam mine bench where the highwall miner was to be assembled.

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  • Hypothesis of the multiple subsidence trough related to ...

    Coalfields in the north of Spain (Asturias) are mainly steeply dipping and at considerable depth. There is widespread use of caving mining methods at the present time. This paper describes a theory developed to predict the subsidence related to very steep and nearly vertical coal seams (70°–90°). This ‘theory of the multiple subsidence trough’ is applied through a new profile

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  • New developments in steep seam mining (Journal Article ...

    The technical progress that has been made in recent years in the more » area of support, coal cutting, and coal clearance has allowed the mechanization of steep and semi-steep seams. A new method was started in 1981 at the Simon colliery. A caving longwall mining method is used. The dip of the seam averages 33/sup 0/.

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  • Coupled mechanism of compression and prying-induced rock ...

    Steeply inclined coal seams occur widely in many coal-producing areas, including China, Spain, ... layer was reduced after the steep coal seam had ...

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  • "КБ "ГАРНІ МАШИНИ" ("KB "HARNI MASZYNY") // Rozrobky i ...

    Cutter-loader coal combine for working on steep and steeply inclined coal seams. Information for mining mechanical engineers in Colombia, Spain, India, Vietnam. We repair, complete with any spare parts, assembly units cutter-loader coal combine «TEMP-1». This coal combine are used for coal mining on steep and steeply-bent coal seams.

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  • Underground mining of steep seams in India

    [email protected] Thick Seam Mining and Strata Mechanics Department 4 Mining technology Steep coal seams with competent rock mass formations adopted different Mining methods like inclined slicing, horizontal slicing, cross slicing by lonwall mining method in single/multi-lift working with stowing experienced limited success.

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  • Probabilistic analysis of subsidence-induced strains at ...

    International Journal of Rock Mechanics and Mining Sciences. Volume 37, Issue 7, October 2000, Pages 1161-1167. Technical Note. Probabilistic analysis of subsidence-induced strains at the surface above steep seam mining. Author links open overlay panel J Toraño R Rodrı́guez a P Ramı́rez-Oyanguren b.

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  • Modeling and response analysis of the attitude angles of ...

    Jul 12, 2021 · Over decades, the mining depth of coal seam keeps increasing in China’s coal industry, which has exceeded 1000 m in many coal mines. Due to constantly mining, the coal resources in many mines are exhausted. As a result, mining of some steep coal seams is getting more and more attention .

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  • Hydraulic Traction Drive Prevails at Steep Inclines | Coal Age

    Sep 14, 2012 · Typical room-and-pillar mines in steep seam mining applications advance in the dip direction of the seam [AUSIMM 2009, pp.325] instead of the uphill direction. This performance is proof of the CM2’s engineering and hydraulic system, and how an operator can rely on it when it comes to challenging mining conditions.

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  • Subsidence Management System for Underground Mining

    Potash mining is an important economic activity in the north-east of Spain. However, one of the main environmental issues produced for such type of mining is subsidence, which generates horizontal and vertical ground displacements. A Geographic Information System (GIS)-based model is proposed as a management system in a case study with two mines.

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  • Surrounding Rock Movement of Steeply Dipping Coal Seam ...

    May 12, 2021 · The movement of the overlying strata in steeply dipping coal seams is complex, and the deformation of roof rock beam is obvious. In general, the backfill mining method can improve the stability of the surrounding rock effectively. In this study, the 645 working face of the tested mine is used as a prototype to establish the mechanical model of the inclined roof beam

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  • Glossary of Mining Terminology - Miners' Museum

    Coal - A solid, brittle, stratified, combustible rock-like material formed by decomposition of plant vegetation that has been submitted to compaction and induration. Coal Analysis - The determination by chemical methods of the amounts of various components of coal. Coal Ash - Non-combustible material in coal. Coal Bank - Exposed seam of coal.

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  • Subsidence control method by inversely-inclined slicing ...

    Nov 04, 2021 · For ultra-thick steep seams, fully-mechanized horizontal or inclined slicing top-coal caving method are specially used , .Mining-induced ground subsidence is governed by a number of factors, such as dip angle and thickness of seam , , , , mining method and roof control mode.Viewed as a whole, the ground subsidence is large in magnitude and is accompanied

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  • Selecting Methods of Extraction of Steeply Dipping Coal Seam

    Majority of the steep seam consist good quality of coal . Problems 1.Steeply dipping coal mass is observed to be fragile due to their vicinity Of the faults and under the influrnce of folds. 2.Poor mechanisation and automation. 3.Complex rockmass behaviour steep coal seams with competent rock mass formations adopted different mining methods

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  • Frontiers | Mechanism of Rock Bursts Induced by the ...

    The model is established according to the actual size of the coal seam mining area. The B3+6 coal seam is 48 m wide, the B1+2 coal seam is 37 m wide, the middle pillar is 100 m wide, the vertical direction is 600 m high, the coal seam inclination is 87°, and the coal seam strike direction is 2,500 m long.

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  • Hypothesis of the multiple subsidence trough related to ...

    Oct 09, 2004 · Coalfields in the north of Spain (Asturias) are mainly steeply dipping and at considerable depth. There is widespread use of caving mining methods at the present time. This paper describes a theory developed to predict the subsidence related to very steep and nearly vertical coal seams (70°–90°). This ‘theory of the multiple subsidence trough’ is applied

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  • Water outbursts in underground mining with steeply dipping ...

    In a steep coal seam, ... forces exerted on the hydraulic supports proved the characteristics of the roof’s behaviors during the mining of a steep seam. ... Coalfields in the north of Spain ...

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  • Using experimental measures in elaboration and

    2 Model #l: Subsidence induced by mining steeply dipping coal seams Mines at Europe are quite often beneath inhabited areas, therefore much care must be taken to ensure that mine workings do not affect surface structures such as houses, roads, railways, etc. In the case described, a fairly steep seam was to

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  • French thick seams mining practices (Conference) | ETDEWEB

    @misc{etde_8536089, title = {French thick seams mining practices} author = {Adam, R} abstractNote = {In very steep seams in a dense deposit where stowing is necessary to avoid spontaneous combustion, surface subsidence and water problems, a rising horizontal slice method is used, the coal being hard enough and the seams regular (Lorraine). In very thick

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  • Steeply Inclined Seam Longwall Mining Method

    Nov 15, 2016 · 1. Introduction of Steeply Inclined Seam Longwall Mining Projects According to the angle size, Chinese coal industry could be divided into the following stype: nearly-horizontal coal seam if the ...

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  • v118n1a3 Ground control in mining steeply dipping coal ...

    rather than steep, strata. For steep coal seam mining, Kulakov (1995a, 1995b) argued that Ground control in mining steeply dipping coal seams by backfilling with waste rock by T. Zhao*, Z. Zhang†, Y. Yin*, Y. Tan*, and X. Liu† 13'-6-The mining of steeply dipping coal seams involves significant safety risks

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  • Study of Top Coal Partition and Key Delayed-Action Region ...

    Horizontal sublevel caving is the unique way to mine the steep and extra thick coal seams. We aim to determine reasonable height of horizontal subsection, which is crucial to ensure the output and safety of mining. For this aim, a theoretical model is established to determine the theoretical solution of elastic stress distribution in deeply inclined coal seam, and first principal stress ...

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  • (PDF) Subsidence Management System for Underground Mining ...

    Potash mining is an important economic activity in the northeast of Spain. However, one of the main environmental issues produced for such type of mining is subsidence, which generates horizontal and vertical ground displacements. A Geographic

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  • UNDERGROUND COAL MINING: FACTORS, COST, AND TIME ...

    • Until the early 1970's, the majority of coal production in the U.S. was via underground mining methods. • Advancements in technology (primarily hydraulics and explosives) and expansion of mining activities in the west (particularly in the PRB), have shifted mining trends from underground to surface production over the past 40 years. Year

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  • Gas Drainage Technology in Fully Mechanized Caving Face ...

    CU2 coal seam is the main mining coal seam, the thickness of coal seam is 22 - 35 m, the average thickness is 28 m, seam dip is 80˚ - 90˚, the gas content of CU2 coal seam is 7.35 m 3 /t, gas content gradient is 1.65 m 3 /(t.hm), the gas pressure of coal seam is 0.85 Mpa. At present, the working face is W1091, the prepared working face is ...

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  • Glossary of Mining Terminology - Miners' Museum

    Coal - A solid, brittle, stratified, combustible rock-like material formed by decomposition of plant vegetation that has been submitted to compaction and induration. Coal Analysis - The determination by chemical methods of the amounts of various components of coal. Coal Ash - Non-combustible material in coal. Coal Bank - Exposed seam of coal.

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  • Frontiers | Mechanism of Rock Bursts Induced by the ...

    The model is established according to the actual size of the coal seam mining area. The B3+6 coal seam is 48 m wide, the B1+2 coal seam is 37 m wide, the middle pillar is 100 m wide, the vertical direction is 600 m high, the coal seam inclination is 87°, and the coal seam strike direction is 2,500 m long.

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  • coal mining - Underground mining | Britannica

    Underground mining. In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata.Access to the coal seam is gained by suitable openings from the surface, and a network of roadways driven in the seam then facilitates the installation of service facilities for

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  • A Medley of Potpourri: Mining

    Apr 23, 2019 · Spain was one of the most important mining regions, ... Highwall mining is another form of surface mining that evolved from auger mining. In Highwall mining, the coal seam is penetrated by a continuous miner propelled by a hydraulic Pushbeam Transfer Mechanism (PTM). ... previously mined areas, trench mine applications and steep-dip seams

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