Muirshiel Barytes Mine

Overview

A remote Renfrewshire barytes mine worked on and off for around 200 years, which at its peak in the 1950s and 60s supplied roughly a third of the UK's entire barytes output.

History

Small-scale opencast working of baryte (barium sulphate) began high in the moorland above Lochwinnoch around the mid-18th century, with horizontal adits later cut to follow the mineral seams underground. Recorded production between 1859 and 1920 totalled 17,678 long tons. By around 1918 the mine was being run by the Muirshiels Mineral Co. of Lochwinnoch, but production broke off in 1920 and the mine lay idle until it was reopened in 1942 by Messrs Keir and Cawder Ltd together with Messrs James Millar Son and Co Ltd. The Muirshiel Barytes Company was formed in 1947 and sank new shafts to work veins at depths of 210, 310, 410, 510, 600 and 660 feet -- over 200 metres deep. Operations passed to Anglo-Austral Mines Ltd in 1960, the same year electrical winding gear was installed to replace the human- and horse-powered wagons that had previously carried stone and mineral to the surface on rails; Rio Tinto Zinc took over as operator in 1962. Production rose sharply through the postwar decades, from 1,580 tons in 1944 to 5,970 tons in 1946 and 12,002 tons in 1949, peaking at 16,987 tons in 1964, when Muirshiel's output, together with Scotland's other barytes mines, accounted for around a third of total UK production; total production between 1943 and 1969 came to 274,024 tons. Up to 48 people were employed in the early 1960s, including 11 skilled miners each with an assistant, alongside maintenance and surface workers drawn largely from Lochwinnoch and Kilbirnie. The mine finally closed on 5 September 1969, after about two centuries of intermittent working. Barytes mining here was genuinely dangerous work -- many men were killed or badly injured over the mine's life by rock falls and accidents involving explosives, and a 2025 memorial cairn in Clyde Muirshiel Regional Park now names six miners who lost their lives at Muirshiel between 1942 and 1969: James Burns, Eric McQuade, John Dale, Thomas Andrews, Ernest Mulholland and Charles Sprought.

Geology

Muirshiel worked baryte veins in the moorland uplands of what is now Clyde Muirshiel Regional Park, Renfrewshire.

Workings

Baryte was worked first by small-scale opencast pits, later by horizontal adits driven to follow the mineral seams, and eventually by shafts sunk from 1947 onward.

Closure

The mine closed in September 1969, having been worked intermittently for roughly 200 years; its deep shafts have since been safely capped.

What remains

A few surface buildings and areas of opencast working survive within Clyde Muirshiel Regional Park; the deep shafts are safely capped.

Surface buildings, opencast workings and capped shaft sites, now within a public regional park.

Related mines

• Gasswater Mine — The same barytes belt, worked at both ends: the Gasswater mineralisation is described as part of a suite of occurrences extending south-east from Muirshiel in the Renfrewshire Hills into east Ayrshire.

What's uncertain

Points where sources disagree or the record could not be settled; both accounts are kept. All open questions in the archive.

• Barytes mining at Muirshiel was dangerous work, with many men killed or badly injured over the mine's life by rock falls, accidents with explosives, and accidents travelling to and from the remote site, though no single incident is documented in enough detail to stand as a discrete disaster record. (uncertain) ¹

Recorded claims

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

• Small-scale opencast baryte working began around the mid-18th century, with recorded production of 17,678 long tons between 1859 and 1920 before the mine fell idle and was later reopened in 1942. ¹
• Output peaked in 1964 at around 20,000 tons a year, with Muirshiel and Scotland's other barytes mines together accounting for roughly a third of total UK barytes production. ¹
• The mine closed in September 1969 after around 200 years of intermittent working. ^1,2
• Barytes mining at Muirshiel was dangerous work, with many men killed or badly injured over the mine's life by rock falls, accidents with explosives, and accidents travelling to and from the remote site, though no single incident is documented in enough detail to stand as a discrete disaster record. (uncertain) ¹
• By around 1918 the mine was being run by the Muirshiels Mineral Co. of Lochwinnoch; production broke off in 1920 and the mine lay idle until it was reopened in 1942 by Messrs Keir and Cawder Ltd together with Messrs James Millar Son and Co Ltd. ¹
• New shafts sunk from 1947 worked veins at depths of 210, 310, 410, 510, 600 and 660 feet; operations passed to Anglo-Austral Mines Ltd in 1960 and to Rio Tinto Zinc in 1962. ¹
• Production rose from 1,580 tons in 1944 to 5,970 tons in 1946 and 12,002 tons in 1949, peaking at 16,987 tons in 1964; total production between 1943 and 1969 came to 274,024 tons. ¹
• Up to 48 people were employed in the early 1960s, including 11 skilled miners each with an assistant, alongside maintenance and surface workers drawn largely from Lochwinnoch and Kilbirnie; electrical winding gear was installed in 1960, replacing human- and horse-powered wagons. ¹
• A memorial cairn erected in Clyde Muirshiel Regional Park in 2025 names six miners who lost their lives at Muirshiel between 1942 and 1969: James Burns, Eric McQuade, John Dale, Thomas Andrews, Ernest Mulholland and Charles Sprought. ^3,4
• Located at about 55.797 N, 4.620 W. ²

Photographs & further reading

Sources

1. (primary) Muirshiel Barytes Mine in Clyde Muirshiel Regional Park — Clyde Muirshiel Regional Park
2. (secondary) Muirshiel Barytes Mine — Wikipedia
3. (secondary) Barytes Mines above Lochwinnoch — Renfrewshire Local History Forum
4. (primary) Renfrewshire remembers mine workers with new memorial cairn — Renfrewshire Council

Record created: 21 August 2026 · Last researched: 31 August 2026