19th June 2026: BHP does look like it could fall on any bad news or sentiment change @Rick however I reckon the reaction to today's cost blow-out revelations in their Jansen Potash Project Update show that there are still people out there buying the dips with BHP.
MarcusToday said in their miday update today: BHP (-3.9%) is the headline story after flagging cost blowouts on its Canadian potash project rising to $6.7bn - Barclays noted the 42% overrun raises questions over execution of the broader growth pipeline.
Their SP has fallen further since then:

However that still looks Ok because they remain within the rising channel:

Of course, that could change when all of the broker and analyst updates and client notes are received and acted on, but for today, a day in which materials are being belted across the board, particularly mining companies, BHP have held up reasonably well considering the magnitude of that cost blowout: $2 Billion above initial estimates is not an insignificant number. [total investment estimate for Jansen Stage 2 increased today from US$4.9 billion to US$6.9 billion (including contingencies) with first production estimated in late FY2031.]
It's a crack, but BHP isn't broken. Being sold down around -5% on a $2 Bill cost blow-out shows just how much support the company has globally - like I said, there's people buying the dips... so far.
Disc: Not held.
P.S. Additional: Also from the MT newsletter today: BHP has flagged a $2.3bn impairment charge on the Jansen Stage 2 potash project in Canada, with total Stage 2 investment now $6.9bn against the $4.9bn approved in 2023 - the third time BHP has blown past cost and schedule estimates on this project. First production from Stage 2 now pushed to late FY2031. Jefferies reiterated hold and said the update was "unhelpful" given the poor potash price outlook. Stage 1 remains on track for mid-2027 at a cost of $8.4bn, 50% above the 2021 approval.
So this potash project has a history of cost blowouts - not helpful (as Jefferies notes) but not a company killer either. I don't hold them because I want to hold pure plays rather than diversified miners, but I would probably add them to my ISA if they looked cheap. They do NOT look cheap, but they clearly have global support; I do however agree with you @Rick that there are significant risks to the downside with BHP at these elevated levels.
P.P.S. They closed at $61.40 today, so -5.6% down at the end of the trading day. Not really smashed, but down.