Gwynedd Archaeological Trust
Regional Historic Environment Record

Dyffryn Adda Copper Furnace and Precipitation Pits, Amlwch

Primary Reference Number (PRN) : 6789
Trust : Gwynedd
Community : Amlwch
Unitary authority : Ynys Mon
NGR : SH438913
Site Type (preferred type first) : POST MEDIEVAL FURNACE
Status : Scheduled Monument

Description :
Dyffryn Adda furnace is the only identified reverberatory furnace for copper smelting surviving in Wales, which was the most important region in the world for copper production. Such furnaces were once common features in the copper processing industry of Wales. The associated precipitation ponds are the best surviving example of a method of extraction practised extensively on Mynydd Parys but nowhere else in Britain. They are believed to have been used from c.1818 to c.1958. <1>

Sources :
Cooke, N. , 2014 , Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. ( © Wessex Archaeology)
Hadley, A. , 2016 , Proposed Wind Turbine at Nant-y-fran, Cemaes, Isles of Anglesey. Cultural Heritage Impact Assessment. ( © Archaeology Wales)

Events :
45013 : Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. (year : 2014)
45130 : Proposed Wind Turbine at Nant-y-fran, Cemaes, Isle of Anglesey. Cultural Heritage Impact Assessment. (year : 2016)

Related records

Compiled date : 02-10-2000


The above data are supplied by GAT in partnership with its Local Authorities (Anglesey, Conwy and Gwynedd County Councils, and Snowdonia National Park Authority), © GAT 2025 (and in part © Crown, 2025 - as indicated)
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