Sir Humphrey Mackworth

Reformed the Esgair Hir operation as the Company of Mines Adventurers of England alongside William Waller after Sir Carbery Pryse's death in 1694, working the site from 1703 to 1708.

Mines operated

Mine	Region	Years
Esgair Hir and Esgair Fraith Mines	Powys	1703–1708

Record created: 31 August 2026 · Last researched: 31 August 2026