Experienced Geotechnical Contractors helitechccd.com 1-800-246-9721 EARTH SHORING GROUND IMPROVEMENT DEEP FOUNDATIONS VIBRATORY STONE COLUMNS MICROPILES GROUTING PROJECT CASE STUDY Sector: Coal Mine, Bleeder Shaft Description As any Coal Mine expands, bleeder shafts are required for ventilation and mine safety. A long mine wall at a mine facility required a bleeder shaft approximately 16 feet in diameter, to a depth of 900 feet. The new bleeder shaft would be installed through a few major aquifers that would add significant cost and delay to the construction of the shaft due to the infiltration rate of the water at these aquifers. Solution Helitech was contracted to construct a grout curtain wall to divert the water at the bleeder shaft location. Primary and terti

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