(i) Sir Thomas Mostyn of Mostyn, Baronet.
(ii) Thomas Slaughter of Chester esq. and Richard Richardson of Chester, goldsmith.
Mines of lead, copper, caulk and calamine under messuages in the townships of Tre Mostyn and Whitford Garn in the parish of Whitford, co. Flint (detailed bounds given).
Covenant by (ii) to spend £2000 within 7 years on a level from Plas ucha to Garreg Mountain "to drain the soles of the old works there".
Term: 21 years.
Rent: 20s per ton of lead ore, boose and smitham, 40s per ton of copper, and 15s per ton of caulk and calamine.