Wheaton–BHP US$4.3bn silver stream: project economics and risk notes for mine planners
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Wheaton Precious Metals has agreed a US$4.3‑billion silver stream with BHP, securing 33% of silver output from the Antamina copper‑zinc mine in Peru, dropping to 22.5% after 100 million oz, with ongoing transfer payments fixed at 20% of spot and settlement via metal credits. In parallel, Wheaton will invest US$275 million in KGL Resources’ fully permitted Jervois copper project in Australia, taking staged gold and silver streams starting at 75% of payable production and tapering to 25% over mine life. The deals extend Wheaton’s exposure to large, long‑life base‑metal operations while diversifying into Australia.
Technical Brief
- Antamina is a large-scale copper-silver-zinc operation in Peru, giving Wheaton exposure to polymetallic by-products.
- Settlement via metal credits avoids physical silver handling, simplifying logistics and refining interfaces for both parties.
- Jervois is fully permitted, so Wheaton’s staged funding aligns directly with construction and ramp-up cashflows.
- Early deposit payments in 2026 are structured to keep Jervois’ development schedule on track under new management.
- Ongoing transfer payments for both streams are indexed to 20% of spot, fixing a predictable cost structure.
- Partnership with KGL Resources formalises Wheaton’s first streaming exposure in Australia’s regulatory and fiscal environment.
- For other base-metal mines, the structure illustrates how by-product streams can underwrite capex without equity dilution.
Our Take
Wheaton Precious Metals is already a recurring name in our Mining coverage, and pairing this Antamina silver stream with the Jervois copper-linked gold–silver stream further entrenches it as a preferred financier for large copper systems in both Latin America and Australia.
The 20% of-spot ongoing payment structure for both the BHP silver and KGL gold–silver streams keeps Wheaton’s cost base tightly leveraged to commodity prices, which likely preserves margin resilience if copper-linked by-product silver and gold output at Antamina and Jervois ramps as planned around 2026.
With Wheaton’s leadership transition flagged in our 6 February 2026 coverage, locking in long-life silver and gold streams tied to BHP and KGL ahead of the new CEO taking over suggests a deliberate effort to hand over a de-risked, cashflow-visible portfolio spanning Peru and Australia.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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