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Haggs mine water treatment scheme

Information and updates on the Nent Haggs mine water treatment scheme in Cumbria, England.

The River Nent is the second most metal polluted river in England. This pollution, by cadmium, lead and zinc, comes from several different sources and the effects on water quality and aquatic life can be seen for 60km along the River South Tyne and in the Tyne Estuary.

One of the most significant sources of pollution is the Haggs adit, an abandoned mine water drainage tunnel.

To improve the environment for people and wildlife, the Coal Authority and Environment Agency are developing a treatment scheme to remove the metals from the Haggs adit mine water before they get into the river.

Following discussions with the public and other stakeholders, we submitted a planning application to build the treatment scheme on land between Blagill and Nentsberry in Cumbria.

Planning permission was granted by Cumbria County Council in June 2019. You can look through the planning application on the Cumbria County Council website, using the reference: 3/18/9001.

Search the Cumbria County Council website

The mine water will be captured at the adit portal in Nentsberry and taken to the treatment site in an underground pipeline.

The metals will be removed using 3 treatment ponds, then the water will pass through a new wetland before being put back into the River Nent.

We have now appointed a contractor to build the scheme, I&H Brown Ltd.

We have also completed all of the land agreements we need to build and operate the scheme

The first stage of construction started in July 2020 and continues through to Christmas 2020.

This includes:

  • construction of pumping station, open water channels and associated works to Site 38

  • installation of gravity main to A689 carriageway from Site 38 to Haggs adit

  • installation of rising main to adjacent field west of A689 from Site 38 to Nent Bridge

  • installation of rising main to A689 carriageway/verge from Nent Bridge to A689/B6294 junction

  • part installation of gravity main to B6294 carriageway from Site 4 towards A689/B6294 junction

2020 work schedule

Works
July Set up compound to Site 38. View Nent Haggs mine water treatment scheme maps
End of July to end of August Installation of gravity main and open water channels to Site 38.
End of July to end of September Construction of pumping station to Site 38.
Mid August to mid October Installation of rising main to adjacent field west of A689 from Site 38 to Nent Bridge. View Nent Haggs mine water treatment scheme maps.
September to December Installation of a pipeline under the A689 from Site 38 toward Haggs adit. View Nent Haggs mine water treatment scheme maps. The main will be installed to the eastbound carriageway and the works will require 100m sections of 3-way temporary traffic signals, which will be maintained 24 hours a day, 7 days a week. The carriageway will be reinstated as works proceed and surface drainage improvements will also be carried out.

If the weather allows, we may continue work between January and March 2021 to try to shorten the overall time to build the scheme. We will provide information about this work and the construction programme from April 2021 before it starts.

View past updates relating to the Nent Haggs mine water treatment scheme

Read more about the work of the Water and Abandoned Metal Mines programme

Reports

Maps

Maps and drawings relating to the Nent Haggs mine water treatment scheme.

Published 25 February 2016
Last updated 25 June 2020 + show all updates
  1. Added schedule of works, with more detailed plans for the initial 12 weeks between July and October 2020

  2. Building contractor details added to the page.

  3. Updated to include information about anticipated construction date and to remove out of date information

  4. Link for the interactive map of proposals for cleaning up mine water discharges into the River Nent added

  5. Removed information about out of date proposals

  6. First published.