Until the 19th century, the valley and the lower slopes of the Garth facing Taff's Well were full of small coal mines which fed the ironworks below in the River Taff valley, opposite Taff's Well. There is now little trace of these although Y Lan Colliery has recently had its portal partly restored as a memorial to an explosion in 1875. A cleared path now leads to this, near the primary school. The access road to Pentyrch village, Heol Goch, runs between the main and lesser Garth.