The next court appearance for the manager of the Gleision mine has been fixed.
Malcolm Fyfield, 57, of Caerhenllys, Cwmllynfell, faces four counts of gross negligence manslaughter after the disaster, which claimed the lives of four miners.
MNS Mining Ltd, which owned the colliery and employed Fyfield, faces four counts of corporate manslaughter.
Fyfield appeared in Cardiff Magistrates' Court last month for the first time since he was charged and was due to appear alongside the company at Swansea Crown Court on February 11.
Company directors Maria Seage and Gerald Ward appeared in court at the first hearing to represent the company.
A new hearing date has now been set for February 25, at Swansea Crown Court.
Philip Hill, 44, Charles Breslin, 62, David Powell, 50, and Garry Jenkins, 39, became trapped when water engulfed the Gleision mine they were working in just after 9am on Thursday, September 15, 2011.