Mining leases and agreements for the extraction of lead and copper in Llanfrothen, particularly at Bwlch y Plwm, 1726, 1810, 1837, various minerals in Llanfihangel-y-pennant, Beddgelert, Penmorfa, Llanystumdwy and Ynyscynhaearn, 1757, 1823, and stone from a quarry in Penmorfa, 1840; and a detailed, illustrated report on the mineral mines and slate quarries belonging to William Ormsby-Gore in Caernarfonshire and Merionethshire, 1853.