The village grew during the late 19th century and early 20th century with the growth of the
coal mining industry in the area. There were four principal mines in the Pontyberem Area; Pontyberem colliery which was opened in 1845, Pentremawr (1889–), Glynhebog (1892–1949) and Gwendraeth colliery (Watney pit). It was in the Gwendraeth colliery (Watney pit)in 1852 that a terrible disaster took place : 26 men and boys died when water flooded the mine killing all the miners on the night shift. It is said that it took 18 months to recover the bodies . Due to the demise of the coal industry in the
South Wales Coalfield, there are now no high quality
anthracite coal mines operating in the Gwendraeth Valley. Between 1909 and 1953
Pontyberem station on what had been the
Burry Port and Gwendraeth Valley Railway, served the miners and the residents of the village and locality. The renowned Pontyberem safety lamps were made by John Jones (1879–1976) who worked as Colliery Chief Mechanic at
Pentremawr Colliery. The name Pontyberem originates from three separate
Welsh language words,
pont meaning bridge,
aber meaning mouth of a river (into the sea),
estuary,
confluence of a lesser with a larger river and
Beran after
Nant Beran the river that flows through Pontyberem . 'Although not immediately obvious the element aber once formed part of this place name and referred to the location of the pont (bridge) over the river Gwendraeth Fawr just below its confluence with Nant Beran. It was probably lost through the contraction of aber and the river name Beran. The -a- of aber was then interpreted as the definite article y and Beran was probably influenced by berem, a variant of burum (yeast).' Local people understand the name Pontyberem to originate from a simple combination of words. The 'Berem' refers to the frothy buildup (like yeast) on the surface of the water of the Nant Beran, especially near the bridge (Pont) over the Gwendraeth Fawr. == Welsh Language ==