Police say eight people have been arrested as part of a joint National Organised Crime Group (NOCG) and Customs sting.
Officers carried out a series of coordinated raids on addresses across Canterbury yesterday.
"Two appeared in the Christchurch District Court yesterday afternoon facing serious drug charges," a police spokeswoman said.
"We are unable to provide further details currently for operational reasons but will proactively release an update this morning."
It's understood that police will speak at a press conference in Christchurch later today.
Two Canterbury dairy workers appeared in Christchurch District Court yesterday facing charges of importing cocaine on various dates stretching back more than a year.
The 34-year-old man, who was granted interim name suppression, has been charged with conspiring "with persons unknown in Colombia" to import cocaine, seven charges of importing or attempting to import the drug, and four counts of money laundering, totalling more than $600,000.
Ruth Yanid Ramirez Alfonso, 38, from a rural address in Mid Canterbury, is alleged to have been involved in importing drugs going as far back as January 2018.
She has been charged with being in an organised criminal group involved in importing the class A drug methamphetamine, along with six charges of importing or attempting to import cocaine.
The man was remanded in custody without plea to December 1, while Alfonso was granted bail to the same date.
A number of others allegedly involved in the drug-running operation have also been charged.
They are expected to appear at Christchurch District Court today.
Four foreign nationals involved in orchestrating the smuggling of $20 million worth of cocaine into Tauranga, the biggest cocaine haul destined for the New Zealand market, were jailed last year.
Croatian Mario Habulin, 48, Serbian national Deni Cavallo, 48, and Australian nationals Matthew John Scott, 46, and Benjamin John Northway, 37, were all sentenced in the Rotorua High Court, receiving sentences between 14-and-a-half years and 27-and-a-half years.
In May 2016, 35kg of cocaine arrived in New Zealand inside a diamante-encrusted horse head statue, which arrived by plane from Mexico via Hong Kong.
It was, at the time, New Zealand's biggest ever cocaine bust.
The drugs had an estimated street value of up to $14m.
