The son of a Jacobite who fled the country in the Fifteen, Blackett succeeded in 1728 to the estates and mines of his uncle, Sir William Blackett. The income from the estates scarcely covered the interest on the debts with which they were encumbered, but the yield of the coal and lead mines was raised from £4,500 to £5,500 p.a.
He died 14 Feb. 1777.
