BHP ($BHP) received US$4.3 billion when its Antamina silver-stream transaction with Wheaton Precious Metals ($WPM) completed on 1 April 2026. Wheaton paid for rights to future silver associated with BHP’s interest in the Peruvian mine. Wheaton completion notice.
BHP retained its 33.75 per cent interest in Antamina and its exposure to copper, zinc and lead. Its February announcement said the transaction was not expected to increase reported debt. The mine’s operating company is independent and is not a party to the stream. BHP’s filed announcement.
Our view is that the structure deserves a fair hearing. A diversified miner can convert receipts from a secondary commodity into capital for projects it prefers. Shareholders can benefit if management invests that money well. They still need to understand what the company has sold.
How the silver payments work
Under the disclosed terms, Wheaton purchases the equivalent of 33.75 per cent of Antamina’s payable silver, using a 90 per cent payable factor, until 100 million ounces have been delivered. The percentage then falls to 22.5 per cent of payable silver for the remaining mine life. Wheaton also pays BHP 20 per cent of the spot silver price for each ounce delivered. Completion terms.
The initial 33.75 per cent refers to the mine’s payable silver, rather than 33.75 per cent of BHP’s share again. Applying the percentage twice would materially understate what Wheaton bought.
A simple illustrative calculation helps explain the ongoing payment. At an assumed silver price of US$50 an ounce, Wheaton would pay BHP US$10 per delivered ounce. The remaining US$40 is the gross price difference before Wheaton’s financing, taxes and other expenses. The example uses an assumed price, not an October quotation or a return forecast. Wheaton had to pay the substantial upfront consideration to obtain those rights.
For BHP, the economic comparison is between money available at completion and the value of future silver receipts surrendered, allowing for the continuing payments it receives. Calling silver a by-product describes its place in the operation; it does not establish that shareholders should be indifferent to its value.
BHP’s announcement says deliveries vary with actual production and settlement uses metal credits rather than physical silver delivery. Certain obligations carry parent and holding-company guarantees. Wheaton’s original release also states that the stream has no buyback clause. BHP terms, Wheaton original release.
Production-linked deliveries make the contract different from a conventional loan with fixed principal repayments. The guarantees also give us a reason to examine future obligations alongside reported net debt. A valuation that counts the upfront money but models all the affected silver receipts as still belonging to BHP would overstate the cash available to its owners.
Keep the cash categories straight
In its results for the year ended 30 June 2026, BHP reported US$9.8 billion of group free cash flow, a non-IFRS measure, and identified the US$4.3 billion stream proceeds separately. It reported US$8.7 billion net debt at that date. The figures describe that historical year-end, rather than a current cash balance or today’s enterprise value. FY26 results, pages 1 and 4.
The same results describe US$6.9 billion of copper-segment free cash flow. Footnote iv says segment and asset cash flow includes contributions from non-controlling interests and excludes centrally managed interest and taxes. The segment figure therefore cannot be treated as cash available directly to BHP shareholders. The results also distinguish US$6.8 billion of dividends paid to BHP shareholders during FY26 from US$8.7 billion of shareholder cash returns announced for the year. Payment timing matters.
We would keep the one-off stream receipt out of a recurring cash-yield calculation, then reflect the future delivery terms in the forecast. Investors should also use a consistent cash definition when comparing BHP with a coal producer, a pure copper miner or a streaming company. Otherwise the apparently cheaper business may simply have been measured more generously.
The reinvestment has to justify the sale
The constructive case is straightforward: BHP has obtained substantial capital, retained copper exposure and avoided issuing new shares for this transaction. If it deploys the money into attractive projects, or returns surplus capital rather than spending it poorly, the exchange could benefit its owners.
The counterargument is equally substantial. Stronger future silver prices or a longer productive mine life could make the rights more valuable to Wheaton than BHP’s shareholders would prefer in hindsight. Weak reinvestment returns would compound that disappointment. Without a full discounted cash-flow model of the stream and the alternative uses of capital, we cannot establish which party obtained the better price.
For Wheaton, the upfront payment creates exposure to silver prices and future deliveries, with risks around production, counterparties and its funding costs. A low ongoing payment per ounce does not prove a cheap acquisition; the acquisition cost is already very real.
We would assess BHP’s subsequent investments against their actual capital requirements, progress and eventual cash generation. The silver transaction gives management more choices. Shareholders benefit when those choices produce a return worth the silver they have given up.