BHP’s $2.3B Jansen potash hit: capex, schedule and cost lens for mine planners
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
BHP will take a $2.3 billion impairment on its Jansen potash project in Saskatchewan as Stage 2 capex rises to $6.9 billion and Stage 1 costs climb to $8.4 billion, lifting total projected spend to $15.3 billion. Stage 2, now only 16% complete, has been delayed around two years to first production in late FY2031, with BHP blaming extra construction hours and higher material quantities. Once both stages ramp up, Jansen is planned to produce about 8.7 Mtpa, roughly 10% of global potash output, at a targeted $114–130/t unit cost.
Technical Brief
- Stage 2 capex uplift of about $2 billion is attributed mainly to extra construction hours and material quantities.
- Stage 2 construction progress is only ~16% complete at the time of the June 2026 update.
- Stage 1’s approved 2021 budget of $5.7 billion has escalated to an $8.4 billion estimate, roughly +50%.
- Management’s October 2023 sanction of Stage 2 was timed off elevated fertiliser prices post‑Russia’s invasion of Ukraine.
- Analysts at Jefferies estimate the Stage 2 cost increase at nearly 30% versus previous guidance.
- BHP has now exceeded original cost and schedule estimates three times across Jansen Stages 1 and 2.
- Despite the impairment, BHP is holding group capital expenditure guidance steady at approximately $11 billion.
Our Take
With Jansen’s combined capex now flagged at about $15.3 billion, BHP’s move in a 17 June 2026 piece to sell roughly $1.5 billion of Chilean transmission assets suggests a broader effort to recycle capital from mature copper infrastructure into long‑dated growth options like potash.
Our database shows BHP appearing across 1,197 mining stories and multiple copper and iron ore items, so the decision to absorb a $2.3 billion impairment at Jansen indicates the group is willing to tolerate short‑term balance‑sheet pain to secure a fertiliser position that diversifies it away from pure steel and battery‑metal exposure.
Given Jansen’s expected 10% share of global potash output late in the 2031 fiscal year, cost blowouts of 30–50% at this scale are likely to set a higher reference bar for greenfield potash capex globally, which could make smaller Saskatchewan or Salta‑province entrants in potash and lithium more sensitive to financing and schedule risk.
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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