Teme-Augama Anishnabai and Temagami First Nation (TAA) sought leave to intervene as added party plaintiffs in the Restoule action, a case concerning the Robinson Huron Treaty of 1850.
While the original plaintiffs and Canada consented to the intervention, Ontario opposed a specific condition that would allow TAA to seek leave to file reply reports to Ontario's reports, even if TAA had not previously filed principal reports.
TAA argued this condition was necessary due to unique interests stemming from a prior Supreme Court decision and ongoing negotiations regarding their s. 35 rights.
The court granted the intervention with the disputed condition, finding Ontario's perceived risk of case splitting speculative and emphasizing the potential prejudice to TAA if denied the ability to respond to evidence on critical treaty boundary issues.