Drugs with an estimated street value of R41 million were found, said
Lt-Gen Solomon Makgale.
Heroin straws, mandrax tablets, heroin powder and equipment were found in the laboratory on Saturday night.
The 19 men were all foreign nationals, aged between 18 and 37.
“We have no doubt that an operation of this magnitude is the work of a syndicate and we believe that we are making great inroads in bringing these major drug syndicates to its knees,” said Makgale.