The former finance manager of Waiwera Water Thermal Resort has launched a personal grievance claim believed to be worth several hundred thousands dollars.
The resort is owned by intensely private Russian magnate Mikhail Khimich.
Former chief financial officer Roger Mackereth left Waiwera Water abruptly in May, after nearly 15 years with the company.
The Employment Relations Authority received a complaint this month.
Mackereth said he'd have to speak to his lawyer before talking to the Herald on Sunday.