ILN is awaiting more information from Gujarat but a subsequent review of the incident supported the management controls in place, according to the ABC.
However, the review reportedly found more attention was required to changes in geological conditions to make adjustments in the level of roof support in some areas.
Development work at the mine was previously on track with a longwall expected to start up by December 2011.
The incident occurred at 8am on Wednesday last week, where a 3-5 metre long section of roof collapsed at an underground road intersection near the No.4 shaft and isolated two men from the rest of the crew, according to the Illawarra Mercury.
Fortunately, no one was injured, but the blockage reportedly had to be cleared from an alternative tunnel.
Joy won the $A90 million contract to supply longwall equipment for the NRE No1 colliery in April.