Interlocks Surveys is quite unique in that two of its Directors are Statutory Certified Mines and Quarries Surveyors.

Richard Todd was the Mine Surveyor during the life of Birch Coppice Coal Mine.

Graham Millward was the Mine Surveyor and Planning Engineer for a number of North Nottinghamshire Coal Mines.

Due to the contraction of the mining industry both men moved into the commercial sector with Richard forming Interlocks Surveys in 1995 and Graham joining later from a multi-disciplinary consultancy.

The company has been the Principle Consultant for the design for entry into a new seam at a UK Minerals Mine with the remit to make the entry from existing workings and allow for maximum extraction of the new seam without sterilisation. The remit also included to design the layout plan for future working which took account of predicted surface subsidence and workings interaction.

The company has also been a Member of a consortium team based in Hyderabad, India which designed and detailed a Project Report for a new Drift Mine in Kapuria, India.

Working on behalf of AMR Construction (India) the report comprised all aspects of mine design from exploration interpretation and geological mapping to the requirements for manpower, materials, machinery, engineering, scheduling etc to cover a 20 year extraction program. It included surface subsidence and tilt predictions for the take along with setting out of cautionary zones for the protection of both mine workings and surface features.

Since 2013 Interlocks Surveys have been a principle consultant for safety inspections of disused/historical coal mine shafts and adits throughout the UK. Reporting to a government body on the effect to public safety regarding access, gas and the potential for mine water contamination.