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On the basis of physical inspection of exposed area in a gallery, the coal mass near an igneous intrusion band is divided into four zones; called as (1) normal, (2) pulverized, (3) Jhama and (4) mixed zone excluding the dyke/sill. Some simple field and laboratory studies were carried out to visualise the nature and extent of variation of strength and cuttability across these zones of igneous intrusion...
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