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St John's Colliery, Maesteg, Bridgend, Wales, UK

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Latitude & Longitude (WGS84): 51° 36' 44'' North , 3° 37' 24'' West
Latitude & Longitude (decimal): 51.61242,-3.62350
UK National Grid Reference:SS876917
Köppen climate type:Cfb : Temperate oceanic climate
Other/historical region names associated with this locality:Mid Glamorgan; Glamorgan
Other regions containing this locality:Glamorgan, Wales, UK

St. Johns Colliery is located on the site of the old Cwmdu Colliery (1850 to 1908) that was worked by the Tondu and Ogmore Coal and Iron Co, and which worked the shallow Victoria seam until its exhaustion.

St. Johns Colliery was opened by North's Navigation Collieries Ltd. in 1910 and worked the middle and lower coal measures at a depth of 385 yards. In the late 1920's, 1480 men were employed here.

The colliery, the last deep mine in the Llynfi valley, closed in November 1985. Heavily overgrown tips remain

Although millerite is rare at this location, St. John's Colliery is one of the westernmost locations in the south Wales coalfield where millerite has been found to occur.

Mineral List

4 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Moscovian - Westphalian
307 - 315 Ma

ID: 2025903
Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated)

Age: Pennsylvanian (307 - 315 Ma)

Lithology: Mudstone, siltstone, sandstone, coal, ironstone and ferricrete

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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