A 23-year-old Sydney man has been charged as part of an ongoing investigation into what authorities describe as Australia's largest cocaine seizure.

The investigation, known as Operation Minjiang, has resulted in the seizure of almost three tonnes of cocaine and the arrest of multiple people across Australia. Authorities say the drugs were connected to an organised criminal network operating across state borders.

Police arrested the Sydney man after conducting a search at his home. During the operation, investigators allegedly seized cocaine, firearms, ammunition, a firearm suppressor and cash.

The Sydney arrest forms part of a much larger investigation involving several properties and suspects. Police have been examining how the large quantity of cocaine entered Australia and how criminal groups allegedly intended to distribute the drugs.

The seizure is significant because of its scale. Authorities have described it as the largest cocaine seizure recorded in Australia, highlighting the size and sophistication of the alleged criminal operation.

Investigators have also charged a 41-year-old Brisbane man in connection with the same investigation. Police allege he played a role in facilitating the interstate transportation of the drugs using a legitimate trucking business.

Authorities have said the investigation remains active and further arrests have not been ruled out.

The Sydney man is facing multiple charges relating to prohibited drugs and firearms. The charges will now proceed through the court system, where the allegations will be tested.

A criminal charge is an allegation and does not establish guilt. The accused remains entitled to the presumption of innocence unless the charges are proven in court.

The investigation demonstrates the scale of Australia's response to organised drug trafficking. Large commercial quantities of cocaine can involve complex transportation networks, financial arrangements and multiple people operating across different jurisdictions.

Police and other law-enforcement agencies involved in Operation Minjiang have continued examining evidence gathered during raids and arrests. Electronic devices, cash and other material allegedly seized during searches may form part of the ongoing investigation.

The Sydney arrest is particularly significant because the investigation extends beyond a single city. Police are examining an alleged interstate network, with arrests and investigations involving both New South Wales and Queensland.

Authorities have not ruled out additional charges as investigators continue analysing evidence.

The case is expected to remain before the courts as the investigation develops. Further hearings will determine how the charges progress and whether additional allegations are brought against the accused.