Sustainable natural remediation of abandoned tailings by metal-excluding heather (Calluna vulgaris) and gorse (Ulex europaeus), Carnon Valley, Cornwall, UK
posted on 2023-05-17, 08:56authored byBernd Lottermoser, Glass, HJ, Page, CN
This study was conducted to determine the uptake of elements (Ag, Al, As, Ca, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, P, S, Sb, Tl, U, W, Zn) by native gorse (Ulex europaeus) and heather (Calluna vulgaris), growing on abandoned tailings, Carnon Valley, Cornwall, UK. The metalliferous tailings are particularly As-rich (0.11–0.59 wt% As) and contain acid-generating sulfides (pH 3.36–6.59). Since abandonment three decades ago, gorse and heather have colonized much of the exposed tailings surface. Biogeochemical analyses demonstrate that gorse and heather are opportunistic, pioneering metallophytes that have the ability to exclude metals and As from their above-ground biomass. Concentrations of trace elements in gorse and heather were evaluated in terms of maximum tolerable levels in the feed of rodents and horses. The analyses revealed that gorse and heather do not accumulate large quantities of trace elements (Al, As, Cd, Co, Cu, Ni, Pb, Zn) in their tissue, preventing harmful effects on rabbits feeding on them and transfers of trace metals and As into the developing wildlife food chains. This study demonstrates that (a) biogeochemical examinations of abandoned mined lands can reveal pioneering, metal-excluding plants; and (b) abandonment and benevolent neglect of mined lands can lead to the successful development of sustainable vegetation covers over mine wastes in the long term.
History
Publication title
Ecological Engineering: The Journal of Ecotechnology
Volume
37
Issue
8
Pagination
1249-1253
ISSN
0925-8574
Department/School
School of Natural Sciences
Publisher
Elsevier Science Bv
Place of publication
PO Box 211, Amsterdam, Netherlands, 1000 Ae
Rights statement
copyright 2011 Elsevier B.V.
Repository Status
Restricted
Socio-economic Objectives
Management of solid waste from mineral resource activities