The BHP walked past it argument has been made before. It's legitimate.
I'm not prepared to give it any oxygen but also because it's the source of my (our) opportunity.
If you go back 20 years The Cu price was say 60c per/lb. There was a step change with China's demand. Grades that were sub-economic then e.g. 1% Cu are now considered high grade.
Same for Au. e.g at Boddington. 1g/t was uneconomic. Now it's 'thank your mother for the chickens'.
Similarly all that iron that FMG calls ore was rubbish before that.
I'd better stop now before I offend many more people.