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Two massive to banded strata-bound magnetite-rich ironstones (Fe2O3total + SiO2 = 96%, Fe2O3total > 60%) host Au-Cu mineralization in an intracratonic rift setting within the Mount Isa eastern succession. The deposits are of international interest because of the present divergent views on exhalative versus epigenetic genesis; these ores have features which support both origins.

Starra is the main orebody cluster, consisting of four geographically separate lodes, totaling 5.3 million metric tons at 5.0 g/metric tons Au, and 1.98 percent Cu. The origin of the Starra ores is complicated by an intense deformational...

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