The Prince of Wales will meet key personnel who took part in major efforts to save four trapped miners killed in a devastating underground disaster.
Charles travels to South Wales to meet search and rescue crews and emergency personnel in the community.
Phillip Hill, 45, Garry Jenkins, 39, David Powell, 50, and Charles Breslin, 62, died when water engulfed Gleision Colliery near Pontardawe.
They were among a team of seven men working in the Swansea Valley drift mine when tragedy struck on September 15.
Three men managed to escape when a torrent of water flooded the tunnel they were in after a retaining wall failed.
Rescuers battled through the night and into the next day in the hope that the four trapped men had survived.
The prince, royal patron of the Swansea Valley Miners' Appeal Fund set up in the wake of the disaster, will meet other appeal patrons at the Rhos Community Centre where the miners' families gathered to await information while the rescue was under way.