Wheal Jane - Operation and Maintenance

In partnership with Defra and The Environment Agency, The Coal Authority delivers the 'Water and Abandoned Metal Mines Programme' (WAMM) to help tackle the problem of metal mine pollution and deliver the objectives of the Government's 25 Year Environment Plan and statutory River Basin Management Plans.

The Coal Authority seeks to let an operation & maintenance contract for the Wheal Jane mine water treatment scheme near Truro, Cornwall. The existing operating contract ends in October 2020.

The Wheal Jane mine water treatment scheme treats mine water pumped from below ground using a high density sludge process. The resultant sludge is pumped to a dam and the treated water is discharged to a stream.

In a typical year approximately 6 million cubic metres of mine water is abstracted, 600 tonnes of metal contaminants (predominantly iron and zinc) are removed and 2,000 tonnes of hydrated lime, 7,000 kg of anionic flocculant and 3,000 MW-h of power are consumed.

In addition to the operating plant, the plant infrastructure includes a workshop, storage facilities and office space. The plant is fully manned 8am - 4pm Mon-Fri, with an out-of-hours emergency on-call roster in operation. During peak periods, skeleton weekend coverage is sometimes necessary.

The service required under the contract is the operation of and planned & preventative maintenance to the mine water treatment plant including:

Additional services may be instructed and may include:

The operating contract will be let under the NEC4 Term Service Contract.

Additional information: This procurement will be conducted in the Coal Authority procurement portal InBye where technical supporting information and the tender questionnaire can be found.

See the attached document for information on the freely available access to this portal

Site visit - All interested parties are invited to undertake an escorted visit of the site on

26. November 2019

Those wishing to participate are required to confirm the names and mobile contact numbers of attendees (maximum of three) by way of the messaging function on the procurement portal.

Upon receipt of these details more information regarding the visit will be provided.

Additional Technical Information

There is additional technical information that will support your understanding of the requirements of the site which could not be provided within the procurement portal owing to the size of files.

We will provide this information by way of an encrypted memory stick to any interested parties who provide a postal address to which it can be sent, by way of the messaging function on the procurement portal.

This information is provided on condition of its return to the Coal Authority once the procurement process has been completed.