(i) Sir Roger Mostyn of Mostyn, Baronet.
(ii) John Jones of Pen y Ball in the parish of Holywell, co. Flint, miner and John Pierce of Holywell, miner.
Mines of lead, copper, caulk and calamine under lands in Cwm, co. Flint called Pwll Cowarth.
Term: 21 years.
Rent: 30s. of lead ore, boose and smitham, one seventh of all copper ore, and 15s. per ton of calamine.