Documents relating to lead, coal and copper mines in Denbighshire and Merionethshire, including: a copy of a lease, 18 February 1703, to Sir Richard Myddelton of copper, lead and coal mines in the manor of Denbigh; a lease, 18 May 1704, by Richard Myddelton of copper, lead and coal mines in Eglwys Fach and Llansanffraid Glan Conwy in the lordship of Denbigh; articles of agreement, June 1707, between Richard Myddelton, John Roberts and Johanna Griffiths relating to lead and copper mines in a field called Y Coitie in the township of Nant, parish of Abergele; a copy of a lease, 26 February 1726, of lead mines at Cywarch Hill, Ceunant Du and Brynamlwg in the manor of Mawddwy, by Richard Mytton to John Meredith; a lease, 2 February 1743, of lead mines under Cwmhisan tenement in the parish of Llanfachreth; articles of agreement, 1755, whereby William Lloyd agrees to lease to Isaac and John Wilkinson coal mines under two parcels of land in Bersham, and also covenants to grant them a further lease of Bersham furnace; a lease, 26 October 1758, by William Lloyd of lead mines in the township of Minera, including a plan; a report, [1747x1816], by John Lloyd concerning the effect on William Lloyd's coal trade of new collieries in neighbouring areas; and an opinion, 1783, as to Lord Grosvenor's right to lead ore under enclosures in the lordship of Bromfield and Yale.