"These things take a while to build up from when we can start and when we can finish, collecting the evidence to make sure we have enough.''
A number of other search warrants were executed in the Queenstown area relating to the distribution of methamphetamine, ecstasy and other drugs as part of the same operation.
"Queenstown's quite a small town, there's quite a few tourists going through it...it's always good to stop any supplier.''
One person was arrested in Auckland and a further three people were arrested in Queenstown on drug-related charges, Mr Inglis said.
An address in West Auckland was also searched and a clandestine lab was found, but police were still searching for the person responsible for the lab.
"Methamphetamine is a pretty harmful drug which is the result of numerous violent crimes in New Zealand, so if we can stop it at all and keep it out of the South Island would be good.''