Ht1, thanks for your posts. Very interesting re Tier 1 mines:
"Examples of Tier 1 are BHP and RIO I Ore mines in the Pilbara.
Escondida copper mine
Olympic Dam
Bowan Basin Coal
All these mines have a life of approx 100 years
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Amazing! I have to ask, though (perhaps naively) - how could a mine have a 100 year life? Wouldn't that be like digging through to China, or digging from South Australia to Sydney? :/ Given these minerals don't regenerate, but get depleted once dug up, I just don't get it!
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