Case study:Gategill Beck: Abandoned Metal Mines

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Location: 54° 37' 15.38" N, 3° 2' 44.44" W

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Project overview

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Status	In progress
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Monitoring, Water quality
Country	England
Main contact forename	Hugh
Main contact surname	Potter
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	The Coal Authority (UK)
Parent multi-site project
This is a parent project encompassing the following projects	No

The Wood End low level adit

Project summary

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The Threlkeld mines were worked for lead and zinc between 1661 and 1928. The mines have a long history of causing pollution and fish kills, and the owners were first prosecuted in 1890. The mines are a significant source of heavy metal pollution, particularly cadmium and zinc, in Gategill Beck and the River Glenderamackin, which fails to achieve 'Good' status for the North West River Basin Management Plan. The metal pollution also affects the River Derwent and Bassenthwaite Lake Special Area of Conservation (SAC) and Site of Special Scientific Interest (SSSI). The main source of metals is the Woodend Low Level but there is also diffuse pollution from waste spoil heaps.

Please search for Threlkeld mines pollution to find out more.

Monitoring surveys and results

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district North West River basin Derwent (NW) Subcatchment River name Glenderamackin (Greta) Area category 10 - 100 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 863863 m <br />0.863 km <br />86,300 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Acid Grassland Waterbody ID GB112075070460 Site Edit site Name WFD water body codes GB112075070460 WFD (national) typology WFD water body name Glenderamackin (Greta) Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 16km16,000 m <br />1,600,000 cm <br /> Project started 2010 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Pollution incident, Mine drainage metal concentrations Hydromorphology Biology Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Deculverting, Sealing the culvert Floodplain / River corridor Dam lowering Planform / Channel pattern Lowering of impoundment, Pipe through dam for mine water to travel to future treatment scheme Other Non-structural measures Management interventions Clean up pollution with Defra funding, research on how to capture mine water, reviewed treatment technologies, Passive treatment, potential locations for a treatment system to be constructed Social measures (incl. engagement) Other Improving water quality Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information