Introduction France's top court has reinstated a $1.58 billion arbitration award rendered in investment treaty proceedings between Canadian gold miner Rusoro and Venezuela. In its 31 March 2021 decision,(1) the Court of Cassation accepted Rusoro's argument that the limitation period for bringing a claim under the Canada-Venezuela Bilateral Investment Treaty (the Canada-Venezuela BIT) was a question of admissibility and not of the tribunal's jurisdiction to hear the dispute. Accordingly, the Court of Cassation quashed the Paris Court of Appeal's previous ruling that had reached the opposite conclusion. The Court of Cassation's decision guides the future review of arbitral awards by the French courts and adds to the longstanding discussion in investment treaty arbitration about the distinction between the admissibility of a claim and the jurisdiction of an arbitral tribunal. By deciding that the issue of whether the claims were time barred was a question of admissibility (a non-reviewable issue), the court set a clear limitation under French law in this regard.