Peru Faces a New UNCITRAL Silver Claim — Inside a $30bn Arbitration Stack

What happened

In mid-September 2026, a Canadian mining company filed an investment treaty claim under UNCITRAL rules against the Republic of Peru, making good on an earlier threat to seek arbitration over the revocation of its rights to a silver project. The claim, reported by Global Arbitration Review, is structured under the Canada–Peru Free Trade Agreement and is administered under UNCITRAL procedural rules rather than the ICSID Convention — a procedural choice with significant enforcement consequences discussed below.

The filing lands at a precarious moment for Lima. Peru already confronts more than twenty live investor-state cases, with analysts at The Rio Times and Discovery Alert estimating the worst-case exposure at approximately $30 billion. The single largest pending case — a $2.7 billion claim by Canada's Brookfield over the Rutas de Lima toll concession — is itself under the Canada–Peru FTA. The new silver claim adds a further data point to what practitioners are beginning to describe as a systemic compliance signal rather than a series of isolated disputes. Peru's struggle to pay the Lupaka Gold award — which required US federal court enforcement proceedings filed in February 2026 in Washington, D.C. — has already been cited openly by the mining industry as a deterrent to new Peruvian investment.

The revocation that triggered the silver claim has not been fully described in public reporting, but the pattern is familiar in Peru's highland and southern jurisdictions: social conflict, community blockades, and administrative cancellation of concessions without the procedural steps that investment treaties require. The Mondaq analysis published this month on mining, indigenous consultation rights, and investment treaty protection confirms that tribunals have consistently held Peruvian revocations unlawful when they lack due process and compensation — precisely the framework the incoming UNCITRAL tribunal will apply.

Why it matters for dispute formation

The UNCITRAL forum choice is the first structural signal boards should note. Unlike ICSID proceedings — where Article 54 of the Convention creates an automatic recognition obligation in all 158 member states — a UNCITRAL award must be enforced under the New York Convention on a country-by-country basis. Peru is a New York Convention signatory, but the enforcement pathway runs through Peruvian domestic courts in the first instance, exposing the winning claimant to the same friction that Lupaka has encountered. This dynamic creates a leverage asymmetry: Peru can frustrate payment even after losing without formally breaching any single enforcement order in a foreign court. For general counsel advising on new Peruvian concession agreements, ICSID arbitration clauses — where available — materially reduce this post-award execution risk.

The second dispute-formation pressure is systemic stacking. When a state accumulates more than twenty concurrent investor-state claims, each new arbitration request acts as corroborating evidence in every other proceeding: it supports claimants' arguments that host-state conduct is a pattern rather than an isolated measure, and it erodes the respondent's ability to argue that revocations were lawful, proportionate, and non-discriminatory. Peru's counsel in the silver case will face documentary discovery requests that will span administrative files produced in parallel ICSID proceedings, including the Lupaka record, the Bear Creek Santa Ana file, and the South American Silver tribunal materials. Cross-contamination of evidentiary records across concurrent cases is now a structural feature of Peru's arbitration exposure, not an edge case.

The third signal concerns the Canada–Peru FTA specifically. Canada has now filed — or backed the filing of — at least two significant investment claims under this single treaty in 2025–2026. Treaty shopping is not the concern here; the concern is that a bilateral instrument designed to encourage reciprocal investment is instead generating a concentration of arbitration exposure on one side. If the FTA's dispute resolution chapter produces multiple adverse awards against Peru without corresponding Canadian concessions being challenged, Lima will face political pressure to revisit or renegotiate the agreement — a risk that could affect Canadian operators who currently rely on FTA protections for existing projects.

Who's exposed

What to watch

• Whether Peru registers an annulment or challenge mechanism once a UNCITRAL award issues — and whether domestic courts cooperate or obstruct enforcement, following the Lupaka pattern.
• Whether the incoming Peruvian administration signals any omnibus settlement posture toward its $30bn docket, similar to the Gramercy Funds bond settlement of December 2024, which reduced a $1.8bn exposure to roughly $33m.
• Whether the Canada–Peru FTA dispute concentration prompts Ottawa or Lima to seek a bilateral review of the treaty's investor-state chapter — which would affect all Canadian miners currently relying on FTA protections.
• Whether the UNCITRAL tribunal grants provisional measures to freeze concession reallocation during proceedings — a step that would significantly constrain Peru's ability to reclassify or re-tender the silver project area.