The board would not have the authority to issue any mineral right or deny access to lands. The board's jurisdiction is strictly limited to resolving disputes over terms and conditions of access, and any compensation payable for that access when a right of access already exists under another act of Parliament or a land claim agreement.
Furthermore, the land claim agreements do not provide the authority for the board to deny access. For example, in the Sahtu agreement it states that the board shall have a jurisdiction to grant right-of-entry orders, whether or not compensation for free entry has been determined, but the board may not refuse to grant a right-of-entry order where an applicant has a right to access Sahtu lands
That's an example from one of the agreements.