
Emergency services were called to Aberpergwm, near Glynneath, Neath Port Talbot, at 10:45 GMT on Friday.
The Welsh Ambulance Service said there were reports a man was trapped underground and drifting in and out of consciousness.
It is the second incident at the mine this month. On 3 November, two men were taken to hospital and another treated for shock after a collapse at the site.
After the latest incident the Health and Safety Executive said an inspector would be visiting the site.
Two ambulances and the air ambulance were sent to the scene.
Aberpergwm is believed to employ about 230 people and to have coal reserves of around 6.8m tonnes.
The incident happened as Prince Charles was meeting rescuers involved in attempts to save four miners who died when a drift shaft at Gleision Colliery in the nearby Swansea Valley flooded in September.
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