Case study:Carnon River: Abandoned Metal Mines

This case study is pending approval by a RiverWiki administrator.

Approve case study

 

0.00

(0 votes)

To discuss or comment on this case study, please use the discussion page.

Location: none specified

Edit location

Project overview

Edit project overview

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

This case study hasn’t got a picture, you can add one by editing the project overview.

Project summary

Edit project overview to modify the project summary.

The Carnon River catchment is located in a region of Cornwall historically renowned for tin and copper mining activities. It flows through an area described in the 19th century as ‘the richest square mile anywhere on earth’ and is now part of the Cornish Mining World Heritage Site http://www.cornish-mining.org.uk/areas-places-activities/gwennap-kennall-vale-and-perran-foundry). Mining in the catchment started with simple tin streaming to exploit the alluvial tin deposits along the river. By the early 18th century, the area became one of the most heavily mined, with deep workings across the region exploring the rich mineral lodes for tin, copper, arsenic, silver and lead. Some of the workings associated with Wheal Jane and Mount Wellington mines were extended underneath the river itself at a very shallow depth – just a few metres below the surface.

The entire length of the river is impacted by historic mining, as are both major tributaries, with numerous individual sources. The headwaters around Chacewater contain several historic mining and processing sites, notably Wheal Daniell. Further downstream at Twelveheads, the St Day Stream joins, carrying drainage from the Wheal Maid mine and tailings dam as well as other mineworkings in the Poldice Valley. Below Twelveheads, the County Adit discharges into the Carnon. This is not associated with one particular mine, rather it drains a huge heavily mined area to the west of the river. Construction of the Great County Adit started in 1748, and it is made up of a network of tunnels nearly 40 miles in length, draining over 100 individual mines. Recent data suggest County Adit contributes 70-80% of downstream loadings of cadmium, nickel, copper and zinc, and effectively 100% of arsenic and iron. The average annual loads from the adit are:

Cd 20 kg
Ni 570 kg
As 1,500 kg

Cu 1,600 kg

Zn 13,700 kg
Fe 80,000 kg

There are large areas of mine spoil along the river valley sides which are almost certainly causing diffuse impacts in wet weather. Further downstream, the biggest tributary, the Hicks Mill Stream, enters the main Carnon. This drains a very heavily mined area on the outskirts of Redruth and contributes 20-25% of loadings of cadmium, copper and zinc. Also here at Bissoe is the Wheal Jane mine site and tailings dam. Wheal Jane was the last operating mine in the area, but when it finally closed in 1991, the dewatering pumps were removed and the workings flooded. In January 1992 a massive uncontrolled release of highly acidic minewater occurred through the Nangiles adit portal. This became one of the most notorious pollution incidents in South West history with a large area of the Fal Estuary stained bright orange by the resultant plume. Although the effect was determined to be short-term, options for long term treatment of the Wheal Jane minewaters needed to be explored. Passive treatment was trialled but ultimately found to be inadequate and since 2000, a full scale treatment plant has operated at the mine site, discharging treated minewater into the Carnon via the Clemmows Stream.

WFD Compliance The whole river length from headwaters to tidal limit is non-compliant with Water Framework Directive Standards to varying degrees for cadmium, nickel, arsenic, copper, zinc and iron. The WFD monitoring site at Bissoe is below all the main impacts and most recent mean levels here are:

Cd 1.72ug/l (EQS = 0.09)
Ni 35ug/l (EQS = 20)
As 80ug/l (EQS = 50)
Cu 123ug/l (EQS ~2)
Zn 1054ug/l (EQS ~12)
Fe 2578ug/l (EQS = 1,000)

All of these are non-compliant, but copper and zinc concentrations are approximately 80-90 times the standard for good status, whilst cadmium (a Priority Hazardous Substance under the WFD) concentrations are about 20 times the level needed to achieve good status. Invertebrate surveys here have also exhibited ‘poor’ or ‘bad’ status. The river is effectively dead in terms of ecology.

Remediation Treatment and management of the Wheal Jane minewaters will continue under the Coal Authority with funding from Defra. However, because of the extent, number and nature of other abandoned metal mines impacting the catchment, we do not currently know if it will be technically feasible to clean up the river at an acceptable cost.

Monitoring surveys and results

This case study hasn’t got any Monitoring survey and results, you can add some by editing the project overview.

Lessons learnt

This case study hasn’t got any lessons learnt, you can add some by editing the project overview.

Image gallery

Edit Image gallery

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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) Project started 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other 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