Crown Pillar definition

Crown Pillar means a rock mass of variable geometry that is situated above the uppermost underground workings of a mine and that serves to ensure permanently or temporarily the stability of surface elements and underground workings.
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Examples of Crown Pillar in a sentence

  • The thickness of crown pillar is about 48 meter from (-) 22 mRL to (-) 60 mRL and (-) 380 mRL to (-) 370 mRL) of 10 meter is kept for Band-I and Crown Pillar (+) 140 mRL to (+) 120 mRL, (-) 120 mRL to (-) 130 mRL) for Band-II for safety and stability of Underground working.