Leases mainly by members of the Ormsby Gore family of Brogyntyn, of lead, copper, manganese and sulphur mines, and of slate quarries in the parishes of Llanaber, Llandanwg, Llandecwyn, Llanddwywe, Llanelltud, Llanfihangel-y-traethau and Llanfrothen in the county of Merioneth, 1837-1947. The sites include Bwlch-y-Plwm, Pant y maesudor and Pant-y-Maesydd, 1837-1875, Rhosiger, Farchynys and Sylfaen, 1859-1888, Lletty Fwyalch and Llechwedd Du, 1867-1872, Hafod Ucha, 1872-1873, Rhosydd, 1890-1891, and others. One file (ref. 55/8) contains a lease by Queen Victoria to William Richard Ormsby Gore of coal, metals, metallic minerals and ores, limestone and slate on or under land in the parishes of Llanenddwyn, Llanddwywe and Llanelltud, Merioneth, 1894.