Former Galmoy Mines tailings restoration Cora Devoy1, Linda Wrong1, Kevin Collins2 1Environmental Manager, Lundin Mining Corporation,
[email protected] 1Director of Sustainability and Regulatory A airs, Lundin Mining Corporation,
[email protected] 2Bird Watch Ireland - Tipperary Branch,
[email protected] Abstract Galmoy Mines completed the restoration of a tailings management facility (TMF), in- corporating an engineered wetland, returning the site to a land use compatible with the surrounding countryside, while e ciently treating surface water runo and creating an enhanced environment for local and migratory bird species. Increased breeding density of Curlews (IUCN Red List), in addition to nesting Little Ringed Plover and a Glossy Ibis were observed, demonstrating biodiversity support. e wetland system improved post-closure water quality. Ammonia in the revegetated caps of the TMF has stabilised and reductions in the sulphate were noted as the TMF remediation matures. Keywords: Mine Closure, Wetland, Biodiversity, Little Ringed Plover, Ammonia, Sul- phate Introduction of the progressive rehabilitation of Phase 1 Galmoy Mines zinc-lead deposit, located in (9.36 Ha) and Phase 2 (14.02 Ha) of the TMF south-central Ireland, discovered in 1986 was completed during mine operation. TMF (Doyle 2016), was owned and operated by drainage design allowed for the safe discharge the Lundin Mining Corporation since 2005. of water during the operational and post-clo- Most of the underground mine workings sure stage. e three main sources of water were between 100 m and 160 m below sur- identi ed were seepage water from the inter- face, hosted in extensively dolomitized and nal drainage within the cells (potentially con- brecciated basal Waulsortian (Lower Carbon- taminated), tailings surface water discharged iferous) “Reef” mudbank limestones Produc- from the TMF (potentially contaminated), tion of concentrates at Galmoy commenced and clean surface water reporting to the pe- in early 1997, with mine production carried rimeter drains (Golder 2011).