Former Greens leader Bob Brown is undeterred in his campaign to stop the Adani coal mine in central Queensland, warning "we will make this international" at a protest in Canberra.

Queensland's environment department on Thursday signed off on the company's plan to manage groundwater on and around its Galilee Basin mine site – the final approval the company needs to begin construction.

Former Greens leader Bob Brown speaks during a 'Stop Adani' vigil outside the High Commission of India in Canberra on Saturday. Credit:AAP

But this hasn't halted the "Stop Adani" protests, with some 200 campaigners holding a vigil outside of the Indian High Commission on Saturday.

Dr Brown and his anti-Adani convoy to Queensland have been partly blamed for Labor's poor election showing in the region, with locals viewing the protest as the south telling the north what to do.