Projects: Coals, Mineral & Metals

Ledcor, along with its partners Thyssen Mining and Redpath, was awarded the construction of permanent concrete/steel liners and related works for two potash mine shafts, both approximately eight meters in diameter and  one km in depth. Our scope of services included: 

•  Construct the Service and Production Shaft final liner composed of:  
  - ½ inches thick outside welded steel plate liner (OWL) 
  - 70 MPA steel fibre reinforced concrete 200 mm – 900 mm thick  
  - 65 mm thick inner welded liner (IWL)
  - 50 mm-200 mm thick grout

• Equipping of the Service Shaft and establishment of temporary hoisting facilities and utilities in the Production Shaft

• Engineer, procure, and fabricate all construction aids (Galloway, slip form, ropes, sheaves, etc.) 

• Modify, operate, and maintain the Construction Plant (temporary hoisting plant, headframe modifications for lining and/or equipping, temporary ventilation system, work platforms, storage facilities, offices, winches, formwork, concrete buckets, pumps, pipework, cranage and tools) 

• Supply, installation, commissioning, operation, and maintenance of a wet concrete batch plant 

• Modify, operate, and maintain all plant facilities related to the work, structures, and systems (freeze plants, collar house, hoist house, standby diesel generator, transformer, switchgear, mechanical and electrical workshops, stages, hoists, winches, compressor building, compressors, headframe, steel plate preparation building, chillers, heaters ventilation, ground support, in shaft instrumentation, permanent materials, forms, equipment, tools and primary liner for each shaft)

• Approximately 28,000 m3 (98,881 ft3) of concrete was used to construct the concrete liner, and 6,700 MT of steel was used to construct the steel liner