Reports, 1874-1926, drawn up by William Galloway and others (including his son, Christian) relating to the mining of coal and other minerals in Wales and elsewhere around the world, examining matters including mining engineering, geology, the economics of working minerals (sinking shafts, mineral extraction, mineral quality, labour, maintenance, transport and selling prices) and the history of mineral working; the reports comprise examinations of mines, mineral fields, mineral seams and other geological strata, as well as statistics, maps, plans, diagrams, photographs, sketches, correspondence, inventories, itineraries and notes; the archive also includes related material, 1957.

Seven diaries (1845, 1847, 1849, 1850, 1854, 1855, 1858) and two notebooks (1857 and 1858) of William Southern Clark.