The Land Consultancy Limited has recently completed shallow mining site investigations in Newcastle, Burnley, Bolton, Wigan, Stoke-on-Trent and Birmingham.
The potential for a site to be affected by shallow coal (or other) workings is usually highlighted at the desk study and site walkover phase, following the study of geological and historical plans and a Coal Authority mining report. Mine abandonment plans are often obtained from the Coal Authority if the presence of shallow coal seams is suspected. As well as shallow workings, bell pits, mine shafts or adits may also be present on or adjacent to some sites. Mine entries may or may not have been treated; and, unrecorded entries may also be present which may only become apparent after construction works have started.
The extent of the site investigation works undertaken to determine whether the consolidation (by drilling and grouting up) of shallow workings is required is determined by the findings of the desk study and the nature of the proposed developments. Mine entry locations should also be investigated to confirm whether or not they have been adequately treated. Even if treated and capped, it is not normally advised that buildings are sited over or in the immediate vicinity of mine entries.
Exploratory techniques frequently utilised to undertake shallow mining investigations include: to look for mine entries – soil stripping (with an excavator), rotary sprial drilling and geophysics; and to determine whether workings are present – open hole rotary drilling used a water flush. Monitoring for mining gases is undertaken during the site investigtaion works.
No intrusive investigations are undertaken by The Land Consultancy Limited until permission has first been received from the Coal Authority.
Please click on the case studies link to read about some of the shallow mining site investigations which The Land Consultancy has recently undertaken.