Do a Google search for Raasay Iron mine - quite a few pages of info come up.
Inverarrish Ironstone Mine [=Raasay Iron Mine] NGR NG 553 340-NG 569 371 Landranger 32
Draper, Laurence and Pamela. Supplemented edition 2003 The Raasay Iron Mine 1912-1942 / Where enemies became friends 79 pp, 22 plates, 10 tables, 6 plans, 4 figs. Contrary to the Geneva Conventions, German Prisoners of War mined iron ore just off the coast of Skye in Scotland. SB Dingwall: The Authors.
Fabian, Derek John 1989 The Islands of Scotland including Skye. Scottish Mountaineering Club District Guidebook, 364
Gribble, C D 1983 Mineral resources of the Inner Hebrides. Proc Roy Soc Edin, 83B 611-625. 613 Raasay iron. 613 Islay lead.
Boyd, J Morton and Boyd Ian L 1990 The New Naturalist The Hebrides. 349 Raasay iron. 350 Islay lead.
Haswell-Smith 131 iron mining by Baird & Co using German prisoners of war [a war crime?] closed 1919. 132 location map.
Industrial Heritage - Industry People Transport. 27 (1) Spring 2001 Iron Mining on the Isle of Raasay, Scotland by Rota. The massive iron deposits were discovered during surveys carried out before the Great War. During the 1914-18 war they were worked by Baird Ltd who mined 140,000 tons underground and 12,000 tons opencast. The mine was entered by the main adit at 330 feet above sea level. From here the ore was lowered down an incline for 1¼ miles to a 4,000 ton ore bin, where it was taken by steamer to Glasgow for smelting. The mine closed in 1919 and in 1941 all available scrap metal was recovered for armaments. The headings were 12 feet wide by 8 feet wide and until recently one was still open. The article is illustrated by 8 fine photos and 3 maps.
Warwick, Chris 2005 Some Caving Notes. GSG Ser 4 2 (4) 25 Raasay Iron Mine. Gated, but can easily climb over. Three hour trip hundreds of metres of passage.
WL Oban 1936/7 100 Raasay Iron Mine
Cutting coal in my spare time.