MineArchiveSir 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 |
| Gnoll Colliery | Neath Port Talbot | ?–? |
Record created: 31 August 2026 · Last researched: 31 August 2026