On Friday the territorial and federal governments announced they had drafted socio-economic and environmental agreements with the mining company.
On Thursday Stephen Kakfwi, economic development minister, and BHP's Jim Excell signed their names to the socio-economic deal.
The document sets guidelines to ensure Northerners have access to training, employment and business opportunities that flow from the $750-million project.
Also included are provisions for a diamond evaluation facility in the North, Kakfwi said.
The deal still has to be approved by BHP's board of directors.
"I believe we are at a point where we can be comfortable in clearly expressing our support for this project," Kakfwi said. "The government was keen to have this socio-economic agreement and we didn't have difficulty with that," Excell added.
The draft environmental agreement, meanwhile, calls for the establishment of an independent environmental monitoring body consisting of four aboriginal representatives, one from BHP and one each from the federal and territorial government.
The agreement also links the environmental effects during the operating life and closure of the mine to the regulatory process.
An environmental agreement was one of the conditions Ottawa said had to be met before approval for the mine could be given.
Last Wednesday BHP signed an impact benefit agreement with the Treaty 11 Dogrib.