A report by J. J. Evans on the Moel Faban Slate Quarry, 1887, and on the Capel Curig Slate Quarry, 1889; papers relating to schemes for working an iron ore deposit at Bettws Garmon, Caernarvonshire, 1891; a note on the Capel Curig Slate Co.; a report by John Menzies on the Moel Faban Slate Quarry, 1903; a minute relating to the lease of Pantdreiniog quarry, 1904; memorandum of the deposit of the Moel Faban lease with Lloyd's Bank Ltd, 1906; memoranda of negotiations with the Cefnfaes estate, 1919-1922; an inventory of the moveable plant of the North Wales Development Co. Ltd at Bethesda, 1921; correspondence between George Macdonald and W. J. Parry for the sale of the Moel Faban Green Slate Quarry, 1923; and correspondence and statutes relating to the Slate Milling Corporation at Pantdreiniog and Moel Faban.

Reports, 1903-1908, by W. J. Parry, as general manager of the North Wales Quarries Ltd, on the working of quarries at Pantdreiniog, Moel Faban and Tanybwlch.

Correspondence, 1905-1910, 1920-1921, relating to the working of the Pantdreiniog Slate Quarry.

Papers relating to a dispute at the Pantdreiniog Slate Quarry, 1878.

Reports by [John] Menzies, 1899, and W. Bowen Jones, 1910, on the Pantdreiniog Slate Quarry.

Inventories of plant at the Pantdreiniog Slate Quarry, 1924-1926, and a copy of an agreement between the Pantdreiniog Slate Quarry Company Limited and The North Wales Development Company Limited, 1919.