Western Australia's Environmental Protection Authority
(EPA) in March had originally rejected a proposal by the mining
giant to develop the mine near Pannawonica in the Pilbara
region, after the company unearthed troglobites, which measure
just 4 millimetres (0.16 in) in length. Troglobites live in the dark parts of caves and have
adapted to life in total darkness, using feelers to explore
their way through the dark.
The EPA report in March found there were 11 unique species
of troglobites at the proposed mine site and said mining could
extinguish at least five of them.
However, the agency said in its latest report that Rio
Tinto's Robe River unit had agreed to increase the size of a
mining exclusion zone to ensure that suitable habitat would
remain for all known species of troglobites.
Robe River had also offered evidence that troglobites had
persisted after mining at two similar sites in the Pilbara.
"It is the EPA's judgement that the proposal is now capable
of meeting its environmental objective with regard to
subterraneum fauna," the agency said.
Robe River mines iron ore in nearby areas in the Robe River
Valley. It currently produces 32 million tonnes of ore per
annum, but the existing deposit will be exhausted by 2010.
The new iron ore mine, with an expected 10-year life, is
planned as a replacement and is forecast to produce 220 million
tonnes.