The Wheal Jane tin mine was closed and the pumps stopped in 1991, allowing the mine to flood.
According to the company, over ten million gallons of polluted water containing iron and other metals was released into Restronguet Creek, Carnon River and Falmouth Bay in 1992 because of a faulty plug in the underground Nangiles Adit.
A bespoke treatment plant was built to meet the discharge limits set by the UK Environment Agency, which was in charge of finding a long-term solution for treating the water, for discharge to the local water course.
Veolia will work for the UK Coal Authority which has recently taken over the role of client from the environment agency.
Veolia is a provider of technology solutions and design-build services in water treatment.
