Thirteen suspects were remanded in custody until September 21 after police uncovered a large methamphetamine production site on a farm northwest of Johannesburg.

The group includes Mexican, Mozambican, Zimbabwean and South African nationals. They were arrested in May during an operation that exposed what authorities described as an industrial-scale facility operating from an isolated property that posed as a game lodge.

Prosecutors have charged the suspects with drug manufacturing, illegal possession of precious metals, illegal possession of hazardous materials and contravention of the Immigration Act. A magistrate ordered the remand while investigators continue forensic work and pursue links beyond the site.

Authorities estimated the value of the drugs produced at around 250 million rand ($15 million), underlining the financial scale of the operation. Residents alerted police after detecting strong chemical odours at the property, a local tip that prompted the raid and subsequent arrests.

The case fits a pattern of stepped-up enforcement. Law enforcement agencies have increasingly targeted sites and suspects believed to have ties to organised groups moving synthetic narcotics. The UN Office on Drugs and Crime says South Africa’s geography, global trade links and a growing domestic market for synthetic drugs make the country a key transit hub.

The remand keeps the accused off the street while authorities expand the probe and, potentially, trace supply and distribution networks. The suspects will return to court on September 21 as police and prosecutors build their case.