A judge has ordered Zion Wildlife Gardens operator Patricia Busch to hand over the park's keys to the receivers after she refused to let them in.
Receivers from PricewaterhouseCoopers were last month called in to take control of the beleaguered reserve, which came under the public spotlight following the mauling death of employee Dalu Mncube by a white tiger in 2009.
In the High Court at Auckland today, lawyer for the receivers Justin Toebes said Ms Busch had defied a previous High Court order by refusing to give the receivers full access to the park and company documents, making it impossible for them to do their job.
He was seeking a court order "with a bit more bite" to get Ms Busch to comply with the receivers.
"All she has to do is open the gates, let the receivers look at the books and let them get on with carrying out their duties.