Mine Workings & Mine Shaft Treatment

Our capability and expertise in this field covers;

• Drilling & grouting shallow coal, ironstone, limestone, chalk, sandstone and fireclay workings
• Using rotary percussive steel casing drilled to rockhead, or to full hole depth if required, to case-off overburden, ensure hole integrity and allow grout pressurisation to be achieved
• Drilling with water flush as standard
• Grouting collapsed workings with pfa/cement or pfa/sand/cement grouts, clay (bentonite) based grouts and use of thixotropic or polymeric additives
• Completing major shallow coal workings treatment contracts with over 10,000 drill holes, up to 250,000 tonnes of grout and resourcing up to 20 rigs
  
  
• Creation of perimeter barriers to treatment grids in open or collapsed workings
  
• Compaction grouting of mine workings and solution features  in chalk, limestone or other strata with sand/cement/pfa/bentonite grout mixes
• Infilling both dry and flooded mine workings
• Location of mineshafts by probe drilling, trial excavation or geophysics
• Treatment of mine shafts up to 400m deep including filling open shafts with granular material, stage grouting, grout caps and reinforced concrete caps
• Use of fully designed drilling platforms for safe mine shaft treatment
• We also have a wide range of bespoke grout mixing and pumping plant much of which is designed and manufactured in-house;
  • Grout mixing equipment from 0.5m³ including high shear mixers for clay based grouts
  • Continuous grout batching plants with outputs of up to 150m³/hr used for central batching on large mine workings treatment sites ensuring control of deliveries, quality, and environmental risks, reduction of material storage and access requirements
  • Mobile grout agitation/pumping units which can be strategically placed or moved as work proceeds, capacity up to 9m³
  • Full range of grout pumps including Gardner-Denver duplex pumps, screed pumps, diaphragm pumps and trailer mounted concrete pumps