Overview of mining in West Cork, commencement of copper mining, Allihies 1813, Ballycumisk and Horse Island 1814, Balllydehob 1820, Cappagh 1820, Gortavallig Kilrohane pre 1854 and 1890, Barytes Bantry, Scart, Derryinagh, Dereenlomane, Mount Gabriel, Dunbeacon Lead in Ballydehob, Gortycloona/Hollyhill (Bantry), Letter, Skeagh.

This a State Report 1922 and presumably accompanies a map. Some of the sources quoted like Griffith are interesting and would reward further study.

http://www.geologicalmaps.net/IrishHistMapsDownload/B02138.pdf

https://durrushistory.wordpress.com/2014/11/19/irish-geologist-1853-lieutenant-colonel-portlock-royal-engineers-on-rocks-bantry-bay-rev-joseph-galbraith-on-slates-of-whiddy-island-w-l-williams-geology-survey-on-geology-of-southern-co-cork/

https://durrushistory.wordpress.com/2014/06/09/slate-quarries-drimoleague-sea-lodge-durrus-kilcrohane-west-cork-skibbereen-and-west-carbery-eagle-or-south-western-advertiser-18656-and-lead-mine-1310-belamire-durrus/