The Coal Action Network is threatening legal action against the UK and Welsh governments over the decision to approve the mining licence at Aberpergwm colliery.
In the latest developments over the controversial coal mine at Aberpergwm near Glynneath, the grassroots campaign last week threatened legal action against both governments over the decision taken last month to grant a new coal mining licence at the site.
The licence will see a further 40 million tonnes of coal mined at Aberpergwm by operator Energybuild Ltd.