Sunk in 1881 to a depth of 1,458 feet to the 7 feet seam of steam coal, George Pit closed in 1905. Although it had a short life the coal originally mined from George Pit was then worked from the wretched Lower Duffryn Colliery, just a mile further down the mountain. 36 colliers died in Lower Duffryn, including a nine year old boy in 1861. The price of coal.