Geological Setting – Jacinth-Ambrosia

Eucla Basin — South Australia

The Eucla region is a large sedimentary Cenozoic basin comprising Tertiary marine, coastal and palaeochannel sediments.

  • The Jacinth deposit is globally unique as it contains heavy mineral occurrences with a very high zircon content; often greater than 40 per cent zircon in high grade, large beach placer style deposits. The margin of the Eucla Basin is dominated by prominent topographic features such as the Ooldea, Paling and Barton ranges that represent the preserved portion of a Tertiary beach barrier system. Iluka’s Jacinth-Ambrosia operation consists of two contiguous deposits being mined sequentially. The deposits to be mined are approximately 5 kilometres in length and 900 metres in width.
    • They comprise free running, fine grained sand.
    • The average thickness of overburden is approximately 8 metres.
    • Ore thickness ranges from 20 metres and has a maximum depth of 45 metres.
    • The average strip ratio is 0.5 to 1.
    • The deposits are low in moisture with no groundwater evident.
    • The Jacinth deposit has a higher average Ore Reserve grade of 7.5% Heavy Mineral.
    • The Ambrosia deposit has an average Ore Reserve grade of 4.9%.

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