(i) Most Hon. Richard, Marquess of Westminster, and Hugh Lupus, Earl Grosvenor.
(ii) Thomas Phipps Thomas of 2 Crown Court, Threadneedle Street, London, mine agent, Martin Dunn of Adwy'r Clawdd, parish of Wrexham, co. Denbigh, mine agent, and John Inman of Lower Broughton, Manchester, iron founder.
Mines of lead ore, lapis calaminaris and black jack in waste or mountain or enclosed land at Nantyffrith, parish of Brymbo, part of the lordship of Bromfield and Yale (map endorsed).
Term: 21 years.
Royalty: 20s. per ton of lead ore, one twentieth of copper ore, and one tenth of blend, calamine and black jack.
Endorsed: 'North Minera'.