Coal Mining TechnologiesCoal mining employs surface and underground methods to extract coal. A number of alternative technologies are associated with each method.tiga pilar and mining coal,[INFOGRAPHIC] 3 Types of Coal Mining | Operations | Mining GlobalOct 21, 2014 . [SLIDESHOW] The Life of an Iranian Coal Miner. The methods for mining coal depends on the location of the deposit. The three primary types are surface, room & pillar and longwall mining. The following infographic breaks down the purpose of each method and what its recovery rate. Surface/Opencast.Coal pillar loading in shallow mining conditions - ScienceDirectMonitoring of the nature and amount of mining-induced stresses over pillars was undertaken at different coal seams with shallow depth cover and varying overlying strata and goaf treatment. The development of abutment loading on the coal pillars facing goaf line is visualised by analysis of the in situ observations at.
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