The union and the port have been at loggerheads over their employment contract, precipitating a strike and a lock-out last month - typically a peak period in the run-up to Christmas.
Gibson said the port was willing to continue mediation - 'but only when we receive a formal response to our latest offer, the ninth since negotiations began in August.'
Gibson said the latest offer was the port's best and final offer.
"It includes a generous 10 per cent rise on hourly rates, performance bonuses of up to 20 per cent on hourly rates, and the retention of existing benefits and entitlements in return for a new roster system that will provide increased operational flexibility while allowing workers to plan their rosters a month in advance.
"We have a business to run. In the best interest of customers, staff and the port's future, some constructive progress is needed from the union, and needed now," Mr Gibson said.
Meanwhile, the port is beefing up resources to keep terminal operations open through the continued industrial action.
Further strike action is planned for a 48-hour period between January 9 and January 11.
- NZ HERALD ONLINE