Mine Workings & Mine Shaft Treatment

Often referred to as 'stabilisation', 'treatment' or 'consolidation', we have been involved in drilling & grouting shallow mine workings for over 45 years. Forkers is considered a specialist in this field and we are in the unique position of being able to resource large mine workings stabilisation schemes from our in-house resources.


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 including dealing with artesian water conditions
  • 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 0.5mincluding 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

Project Profiles

To see our Project Profiles for Mine Workings & Mineshaft Treatment, click here.

  • ISO 9001:2015 Quality Management System
  • ISO 14001:2015 Environmental Management System
  • ISO 45001:2018 Health and Safety Management Systems
  • Investors in People
  • Member of CECA Midlands Region The Civil Engineering Contractors Association
  • Achilles UVDB (Utilities Vendor database) and ‘Verify’ audit
  • Achilles Building Confidence
  • CHAS Contractors Health & Safety Scheme
  • Construction-line
  • Railway Industry Supplier Qualification Scheme
  • Network Rail ‘Principal Contractors Licence’
  • SAFEcontractor
  • Exor Management Services accreditation
  • Member of the BDA British Drilling Association