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TOPIC: A55 Holywell Bypass & Abandoned Mines

A55 Holywell Bypass & Abandoned Mines 4 years 2 months ago #25746

  • Sweetie
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Not really exploration related but I thought it was interesting anyway so thought I'd share it.

I've been reading up and talking to people to try and find a photo of when the Holway Road collapsed near the garage / grange cavern in the 80's due to mine workings below. I'm assuming it is the same mine that passes under Doug's place?

I found some info from a powerpoint presentation compiled by Nottingham University. Here are some of the key points:

  • 36% of route affected by mining of lead, zinc & silver ceased in early 20th century

  • The west of the bypass crosses limestone terrain that has been extensively mined till the early 20th century for lead, zinc and silver.
    At one period it was the largest lead production area in Europe.
    This extensive mining left a network of abandoned mines which posed geo-hazards such as ground failure resulting from the collapse of unsupported mineshafts & subsidence due to subsurface workings in mineral veins.

  • The areas affected are just west of Dolphin Interchange.

  • Mining records of the area were limited so pre-contract investigation works were carried out by specialist mining consultants.
    The investigations involved detailed examination of historical documents, old mining records and maps.
    Onsite, mine access inspections were carried out where possible to determine the size, extent and conditions of the mineral workings.
    Boreholes were also drilled and CCTV cameras inserted to monitor inside some mines.

  • 34 mineshafts were capped.
    At 7 locations where mine-workings were larger and mineral veins crossed the route, rock head rafts were constructed.
    Continuous annual monitoring of the area, now takes place.

Distribution of mineral veins along Holywell Bypass

Capping a shaft with a concrete raft

I didn't manage to find the photo I was looking for so will try to free up a day the week after next to go to Holywell library.
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Last Edit: 4 years 2 months ago by Sweetie.
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A55 Holywell Bypass & Abandoned Mines 4 years 2 months ago #25747

  • Doug
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I think that refers to the old A55 when it collapsed at Dolphin just below the Glan yr Afon, very close to Herward shaft, if I remember correctly it was in the late 1970s, and before the Holway collapse, both events caused absolute mayhem as they closed the main route to the North Wales coast. :cheer:
Mae bradwyr ymhobman
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