|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.
4 valid minerals.
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
|Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated)|