I think he/she means to include Mt Dove (depleted) and Pardoo (9Mt @ 55.7%fe).
Neither of these "mines" can be "switched back on when needed". In Mt Doves case, well there is no more iron ore and in Pardoo's case it simply is not economic because its low Fe, high phos. Pardoo does not register in the Reserves.
I admire tomboys enthusiasm, but its pretty clear that there is a significant lack of understanding of the fundamentals. While it's your money and you can do what ever you want with it, I feel you may be embarking on an investment purely based on emotion. If that's the case you might as well slip down to Crown Casino and put it all on Black (or Red, I'm not advising either colour).
Can I suggest booking a meeting with your financial adviser?