Home / News & Insights / Blog / Don't fall into the pits of despair

Don't fall into the pits of despair

06 Jul 2018

Developers can no longer rely on coal mining searches as a result of recent guidance from the Coal Authority.

Given a recent subsidence case in the North-East of England, Isabel Alderton-Sell of DMH Stallard’s Property Development Team looks at a recent call by the Coal Authority to ensure that coal mining legacy issues are not overlooked.

The Facts

The Coal Authority was contacted by the National House Building Council in July 2016 after extensive subsidence at a housing development in North Tyneside came to their attention.   A subsidence zone of around 150 metres x 70 metres affected 35 properties on a housing estate.

Ground investigations subsequently carried out by the Coal Authority revealed historic coal mine workings which were not recorded on the historical mining plans held. The plans actually showed an area of solid coal when, in fact, the Coal Authority’s ground survey showed extraction rates in this area at over 70%, which led to the subsidence. 

The Point

In light of this subsidence event, the Coal Authority has issued the following guidance:

  1. Caution must be adopted in assuming that the absence of a record of coal mining means the absence of mining. The historic plans might not give a true representation of the coal workings on the ground.
  1. Both desk based and ground investigations are necessary to confirm:
  1. potential for unrecorded shallow workings
  2. accuracy of the shallow coal old working plans
  3. competence of the strata overlying the coal
  4. potential effects of groundwater, including assessment of recovering levels post mining which are still taking place today
  5. appropriate ground investigations should always be undertaken to confirm site specific conditions, and local geology also needs to be considered

For more information on this or similar issues, please contact Isabel Alderton-Sell in the Property Development team.

Further reading

  • Brighton Office

    1 Jubilee Street


    East Sussex

    BN1 1GE

  • Crawley Office

    Griffin House

    135 High Street


    West Sussex

    RH10 1DQ

  • Guildford Office

    Wonersh House

    The Guildway

    Old Portsmouth Road



    GU3 1LR

  • Horsham Office

    Ridgeland House

    15 Carfax


    West Sussex

    RH12 1DY

  • London Office

    6 New Street Square

    New Fetter Lane


    EC4A 3BF

  • Get in touch