Trelogan Mine

Overview

A lead, silver and zinc mine on the Halkyn-Holywell orefield worked from the late 17th century to 1911, notable for having housed the first Newcomen atmospheric engine in Flintshire in 1732 and for a final phase of working, from 1897, under the chemical firm Brunner Mond.

History

The Governor and Company for Smelting down Lead with Sea Coal — the 'Quaker Company', later reorganised as the London Lead Company — began working the mines at Trelogan around 1694, prosperously enough that by the 1730s the site justified serious investment in pumping technology: a windmill-powered pump was installed in the 1730s, and in 1732 Trelogan received the first Newcomen atmospheric engine erected anywhere in Flintshire, a major step up from windmill or horse-powered drainage for a mine of this date. Through the 19th century the Trelogan Mining Company worked the Afongoch Vein, upgrading pumping capacity as workings deepened: 30-and 40-inch pumping engines were installed in 1847, and later an 80-inch Cornish beam condensing and pumping engine supplied by Bracewell and Griffiths. Two of these 80-inch engines were later sold on to mines in Cornwall shortly before the First World War. The mine's final phase of working began in 1897, when the chemical manufacturer Brunner Mond reopened it, continuing production until final closure in 1911.

Workings

Lead, silver and zinc worked chiefly along the Afongoch Vein in Carboniferous Limestone. Drainage technology progressed markedly over the mine's life: a 1730s windmill pump, Flintshire's first Newcomen atmospheric engine in 1732, 30-inch and 40-inch pumping engines added in 1847, and finally an 80-inch Cornish beam condensing and pumping engine by Bracewell and Griffiths.

What remains

Surviving remains include converted former mine offices, shaft mounds, whim circles, concrete processing platforms and extensive waste tips northwest of Perth-y-maen, along with stone foundations and revetment walls, though most above-ground infrastructure has deteriorated. A disused mineshaft photographed at Llanasa, the community in which Trelogan lies, gives some sense of the surviving surface remains typical of the site.

Abandoned workings can be dangerous — unstable ground, uncapped shafts, flooding and bad air are common even where a site looks safe from the surface. This entry describes history and general location only; it is not an access guide.

Recorded claims

Individual factual claims, each attached to the source(s) that support it below. Where sources disagree, both are kept.

• The Governor and Company for Smelting down Lead with Sea Coal (the 'Quaker Company', later the London Lead Company) worked the mines at Trelogan from around 1694. ¹
• Trelogan received a windmill-powered pump in the 1730s and, in 1732, the first Newcomen atmospheric engine erected anywhere in Flintshire. ¹
• The Trelogan Mining Company worked the Afongoch Vein through the 19th century, installing 30-inch and 40-inch pumping engines in 1847 and later an 80-inch Cornish beam condensing and pumping engine by Bracewell and Griffiths; two 80-inch engines were later sold on to Cornwall shortly before the First World War. ¹
• Brunner Mond reopened the mine in 1897 and worked it until final closure in 1911. ¹
• The National Library of Wales holds a Midsummer Quarter account, dated 1845, for Trelogan lead mine among the Margaret Mostyn Jones manuscripts. ²

Photographs & further reading

This page doesn't try to reproduce everything — these are the best original sources found for this mine.

Images

Sources

1. (primary) Trelogan Mine (CPAT metal mines survey, site 102786) — Clwyd-Powys Archaeological Trust
2. (primary) Trelogan Lead Mine (Wales) - Margaret Mostyn Jones MSS, NLW MS 23521D — National Library of Wales

Record created: 26 August 2026 · Last researched: 26 August 2026