Holywell-Halkyn Mining and Tunnel Company
Began construction of the Milwr Tunnel, a major drainage tunnel, in 1897.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Halkyn Mountain | Flintshire | 1897–? |
Began construction of the Milwr Tunnel, a major drainage tunnel, in 1897.
| Mine | Region | Years |
|---|---|---|
| Halkyn Mountain | Flintshire | 1897–? |