The Milwr Tunnel is a mine drainage adit running some 10 miles from the hamlet of Cadole near Loggerheads, Denbighshire to Bagillt on the Dee Estuary in North Wales. It was originally built to drain the lead mines beneath Halkyn Mountain, which were plagued with flooding in their lower levels, but enabled the exploitation of new lodes and was variously used for the extraction of lead, zinc and limestone during its working history. It is part of a network of mines, lodes and natural cave systems – the Halkyn United Mines – that extends for up to 100 kilometres, the longest in the United Kingdom.[1]
It forms part of the mine drainage system that is responsible for draining Ogof Hesp Alyn and leaving much of the River Alyn between Loggerheads and Rhydymwyn dry during summer months.
The MilwrTunnel is a mine drainage adit running some 10 miles from the hamlet of Cadole near Loggerheads, Denbighshire to Bagillt on the Dee Estuary in...
been driven for great distances for this purpose. One example is the Milwrtunnel in North Wales, which is about ten miles (16 km) long. Other examples...
principal. In July 1897 work commenced at Boot End, Bagillt, on the huge MilwrTunnel which would drain water from the mines working the lead lodes under Pentre...
River Alyn are significantly affected by mining, particularly the Milwr mine drainage tunnel which diverts a sizeable amount (23 million gallons of water per...
by vadose streams. Despite the drainage that now occurs down to the MilwrTunnel which is several hundred feet below, during periods of intense wet weather...
There is also an underground lake under Rhosesmor, accessed through the Milwrtunnel, which passes beneath the area. Local facilities include a church, a...
of flooding due to the digging of deep drainage tunnels, with the most important being the Milwrtunnel that leads from Loggerheads to Bagillt. Mining...
Uarc then to Carn y Clyndir or Mark Ycha then to Carn Helig then to Rhyd y Milwr on the River Rhymney then along the River Rhymney to Aberbargoed Bridge...
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