Geology Reference
In-Depth Information
140,000
0.8
Exergy cost
Ore grade
0.7
120,000
0.6
100,000
0.5
80,000
0.4
60,000
0.3
40,000
0.2
20,000
0.1
0
0
1907 1912 1917 1922 1927 1932 1937 1942 1947 1952 1957 1962 1967 1972 1977 1982 1987 1992 1997 2002 2007
Year
Fig. 13.15 Ore grade and exergy replacement cost of Australian iron mines
Fig.13.16TheHubbertPeakappliedtoAustralianironreserves
throughout the last century and so has the associated ore grade. There has been
some variability in the scale of iron ore reserves over time, even recently, due to
price variations. The relative dominance of rich Pilbara iron ore mines has allowed
ore grades to stabilise
6
at around 62%, the equivalent of approximately 0.46 toe/t
(see Fig. 13.15). This is beneficiated and ready to market iron ore and not raw or
6
Prior to the discovery of Pilbara, iron ore mining in Australia in New South Wales and South
Australia was more variable in grade.
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