Found a couple of references:
Omand, Donald 1984 The Ross and Cromarty Book. The Northern Times. 38 Veins of silver-bearing galena, zinc blende, barytes and calcite are found in the Moine schists in Strath Glass. Lead mine operated in the first half of the 19th century. Copper and iron ores (haemitite) occure in the Durness Limestones at Rassal (Loch Kishorn). Casserite occurs in the magnetite-rich bands in granite gneiss around Carn Chinneag intrusion. A vein of graphite was once worked in the Moine schist in Glen Strathfarrar. [Phemister 1960 and Duff 1983]
Phemister 1960 Phemister J 1960 Scotland: The Northern Highlands. Department of Scientific and Industrial Research Geological Survey and Museum
Duff 1965 Duff , P McL D 1965 Economic Geology 🇮🇳 Craig, G Y, (ed) Geology of Scotland (1st ed) Oliver and Boyd, Edinburgh 506-543
Cutting coal in my spare time.