The lab, which was busted in June, was being run by a Canadian national of Vietnamese origin, the agency said in a statement here.
Giving details of other seizures in June, NCB said it had seized 7.78 kg of heroin and 28.1 kg of crystal methamphetamine and various chemicals along with laboratory equipments used in illicit manufacture of methamphetamines.
The agency put the total value of the seized drugs at Rs 63 crore.
It said the NCB had launched a special nationwide drive to arrest absconders wanted for many years in drug related cases.
"As a result of sustained surveillance... 12 such absconders, including a Sri Lankan national and some key traffickers having wide network in India and abroad, have been arrested," NCB said.
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