Critical documents relating to a primary school jumping castle tragedy that killed six children, are being obtained by a coroner ahead of an inquest

Preparations for an inquest into the December 2021 incident at Tasmania's Hillcrest Primary School, have been on hold for two years because of criminal proceedings.

Rosemary Gamble, operator of the company Taz-Zorb which set up the inflatable equipment, was in June found not guilty of workplace safety breaches.

Chief coroner Olivia McTaggart will today provide a "detailed" update about the progress of inquest preparations.