Taken from page 8 of today's Broken Hill presentation.... and...

Taken from page 8 of today's Broken Hill presentation.... and yep, it does say 150years.....
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40 billion tonnes of in-situ magnetite could be defined by future exploration

But, for safety, lets assume that only 50%, say 20 billion tonnes of mineable magnetite ore can be ultimately defined through futher exploration with scope for say 5 pits mining 50 Mtpa ore and beneficiating 10 Mtpa of concentrate each.

Which suggests a total regional output of 50 Mtpa of magnetite concentrate gives a foreseeable 150 year regional life of mining @ nominal 250 Mtpa ore mining rate.

Producing high-quality Blast Furnace feedstock magnetite concentrates grading 65% - 70% Fe content.