FIELD: mining. SUBSTANCE: provides for increased intervals between relief holes as advancing towards axis of working. In this case longitudinal axis of interholechain pillar of maximum width is oriented in same vertical plane with longitudinal axis of development working. Holes are drilled on both sides of longitudinal of development working successively, beginning from holes located on boundary of relief zone, and finishing with holes which outline interhole pillar of maximum width. EFFECT: reduced expenses for support of working. 2 dwg
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