Letters relating mainly to Esgair Hir (the Welsh Potosi) and Esgair Fraith, but also referring to Allt y Crib, Darren, Eaglebrook, the Island and other mines, 1697-1918. For main content see series description. The earliest letters are to Edward Pryse of Gogerddan, Thomas Pryse, David Morgan of Tal-y-bont, John Lewes of Carmarthen, Lewis Pryse, and Edward Loveden Loveden of Buscot Park, written by George London of Royal Garden, discussing an action for debt [by Martin de Carbonell], 1696/7, Rev. Thomas Jones of Llanasa, mentioning Mr Pennant’s colliery, and Thomas Pryse’s parliamentary business [at the time of Walpole’s downfall], 1741-1744, Thomas Burton of Brynmoyle, 1753-1757, Richard Richardson of Chester, 1755-1757, Evan Rogers, 1771, 1780, John Jones of Aberystwyth, 1776, Thomas Slaughter of Chester, 1777, Edward Hughes of Aberllolwyn, 1779-1780, and Philip Tangye of Knenock (?Cyneiniog), 1800, and a copy of an outgoing letter to Henry Bowdler, 1766. Later correspondents include James Reed of Penrhyn-coch, 1852, Samuel Williamson of Holywell, 1852-1853, Richard Griffiths of Machynlleth, 1852, John M. Davies, of Antaron [Aberystwyth], 1852-1853, J.B. Higgs, 1853, Matthew Francis, 1853, Thomas William Wilkinson, 1853-1857, John Henry Murchison, 1858, 1864, all of London, Pryse Loveden, 1853, Edward Lewis Pryse, [c. 1853], James Paull of Goginan, 1855-1858, James Willyams of Llanelli Copper Works, 1856, ? T.H. Rickard of Esgair Hir, 1859, James Lofthouse of Manchester, 1857, James Sanders of Willow Bank Mine, 1858, Joseph Fell of London, 1885-1894, J. Phillips of Goginan, 1888; William Northey of Esgair Hir, 1898-1908, M. Engledue of Byfleet and Tunbridge Wells, 1898-1901, Arthur E. Northey of Esgair Hir, 1900-1902, W.H. Bartlett and J. Whittall of the Welsh Copper Mining Syndicate Limited, 1902-1908, George W. Haywards of Sota and Aznar, London, 1905, Thomas W. Ward Limited of Sheffield, 1908-1909, and E. Llewelyn Davies of Ynyspenllech estate office, 1918. The file also contains a notification of ore-weighing by Evan Rogers at Esgair Fraith, 1778; evidence of Morgan Morgans, sent by Oliver Lloyd [of Cardigan], an account of Welsh Potosi ore bought by Mr Eyton of Holywell, 1855; royalty returns, 1857; a printed report on Esgair Fraith by J. Noel Sparks, 1898; and an inventory of machinery at Esgair Hir and Esgair Fraith [1908],