Geophysical survey enjoys widespread application within brownfield studies and over the years we have located many bellpits, costeaning / trial pits and shafts of various sizes and dates across both coal and the metalliferous mining areas of Cornwall, Devon and Wales. We work to assist invasive investigation and remediation, augmenting and providing context for the work of drilling and engineering contractors.
Geophysical detection of former mine workings, followed by targeted truthing, provides a more reliable and comprehensive result than trenching alone and benefits include:
Rapid magnetic and electromagnetic techniques can identify pithead structures, collars, caps and voids as well as indirect indicators like debris scatters, pipework and tramway remains. For deeper targets electromagnetic and radar methods can search to about 5m and for large voids, e.g. stopes, micro-gravity can be used.
While drilling can identify a void, sometimes a non-invasive approach is more appropriate, e.g. to explore the context of subsidence. The use of radar can be invaluable for a 'first look' and / or to target subsequent drilling or excavation.
We can bring key skills including geological assessment of strata to determine whether disturbed or natural and identification of rock fragments as surface or from depth. Many years experience of landscape survey across the UK, combined with detailed knowledge of surface mining structures from late medieval times onwards means we can effectively target methods and areas.
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