The NLW's People's Collection Wales site has material for this parish, use the onsite search box
Cwmystwyth Mine , planning application for safety work Response on behalf of the Welsh Mines Society.
"The Cwmystwyth Mine is probably the most important non-ferrous metal mining site in Wales. It is certainly the premier example of mining heritage in Ceredigion..........."
Cwmystwyth Mine . During the summer of 1989, a survey was made of the building remains on the area of Copa Hill covered by the Kingside Lode workings of Cwmystwyth Mine (NGR SN805748)...............Since we now know that Cwmystwyth was worked at a date of 1500BC, it seems difficult to believe that 3,000 years passed until the Elizabethan miners "discovered" the mine in the 16th century. Where are the Roman remains? ..........."
Cwmystwyth - on the Spirit of the Miners site
William Lewis Evans and son Lewis, Dolau Ceunant, Llanfihangel y Creuddyn [with hay gambo] - on the People's Collection Wales site
Davies, O. Cwm Ystwyth mines. Arch Camb (1946/7)
Hughes, Simon J. The Cwmystwyth Mines, (2nd edn., Talybont, 1993). For a comprehensive account of the mine during the historic period. For the prehistoric period, see Timberlake, S. and Mighall, T., 'Historic and Prehistoric Mining on Copa Hill', Archaeology in Wales, 32 (1992), pp. 38-44.
Hughes, Simon J S. The decline of mining at Cwmystwyth (NLW's site) Ceredigion, viii 4 : 419-38 (1979)
Rees, D Morgan. Industrial Archaeology in Cardiganshire. Ceredigion : Journal of the Cardiganshire Antiquarian Society. Vol V/2, 1965. Mentions; Cwmystwyth Mine.