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Primary element dispersions associated with mineralization at Mount Isa, Queensland

Created 16/10/2025

Updated 16/10/2025

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This report presents the results of geochemical investigations in the Mount Isa district, northwest Queensland. Samples, mainly from cores, represent Group 2 Shales (comprising Kennedy Siltstone and Spear Siltstone), Urquhart Shale, Native Bee Siltstone, greenstones, and local basic igneous rocks. These have been used to study element distributions in mineralized and unmineralized localities. It was found that primary element dispersions are associated with the 1100 Cu orebody, but not with the Ag-Pb-Zn bodies. This, together with the different modes of occurrence of the orebodies, suggests that the mineralization at Mount Isa took place in two separate events. The Ag-Pb-Zn deposits are considered to be syngenetic whereas the Cu deposits appear to be, in part at least, epigenetic. The chemical evidence suggests strongly that much of the Cu in the silica dolomite bodies was derived from the underlying greenstones. In addition, an attempt has been made to differentiate the Urquhart Shale from the other units on the basis of chemical composition. Of the elements analysed, Ca appears to be the most diagnostic and it may be possible to define the upper limit of the Urquhart Shale using this element.

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Additional Info

Field Value
Title Primary element dispersions associated with mineralization at Mount Isa, Queensland
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/eac590de-908b-4c4d-b447-8bd075aa14fd
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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    [
      [
        139.0,
        -21.0
      ],
      [
        139.5,
        -21.0
      ],
      [
        139.5,
        -20.5
      ],
      [
        139.0,
        -20.5
      ],
      [
        139.0,
        -21.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Primary element dispersions associated with mineralization at Mount Isa, Queensland". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/primary-element-dispersions-associated-with-mineralization-at-mount-isa-queensland