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Olympic Domain Geology and Targets
Geology
The Olympic Domain Project is located on the Stuart Shelf and covers the eastern edge of the Gawler Craton, a geological province containing the Olympic Dam copper-gold-uranium mine, Carrapateena iron oxide-copper-gold deposit and several other iron oxide related copper-gold prospects in the basement rocks. The overlying Stuart Shelf cover sequence hosts the old Mount Gunson copper-silver-cobalt workings, including the Cattle Grid Mine and several undeveloped prospects.
The Olympic Province is interpreted as an ancient eroded surface of crystalline Archean, Paleoproterozoic and Mesoproterozoic rocks consisting of several suites of metamorphic, granitic and sedimentary rocks. Mesoproterozoic igneous rocks intrude and overlie the older sequence. These include the Gawler Range Volcanics and the co-magmatic Hiltaba Suite granites.
Overlying the basement are gently dipping to flat-lying strata of the Stuart Shelf, which range in age from Mesoproterozoic to Neoproterozoic (Adelaidean). The Mesoproterozoic red-beds of the Cariewerloo Basin and the Neoproterozoic Stuart Shelf sediments cover the basement to depths in excess of 1000 m.
Exploration Targets
Copper Range is exploring for iron oxide-copper-gold, and uranium (IOCG-U) deposits within the Palaeoproterozoic to Mesoproterozoic basement rocks of the Gawler Craton.
Recent work has also highlighted the potential for sediment-hosted copper deposits within the overlying late Proterozoic (Adelaiden) Stuart Shelf sequences.
In addition, there is potential for uranium mineralisation at the unconformable contact between the Mesoproterozoic red-beds (Pandurra Formation) and the underlying weathered basement rocks.
Copper Range’s tenements contain positive magnetic features across the range from weak to very strong. The degree of magnetisation may not be an important factor, as the contrasting magnetic response at Olympic Dam and Carrapateena shows. The different magnetic geophysical responses from mineralisation can be explained as a function of the mineralogy, the depth of cover rocks or both.
High-grade mineralisation is more likely to be hosted by hematite, so a positive gravity feature is expected. The ideal host for strong IOCG mineralisation is hematite-sericite-chlorite-carbonate alteration.
The strength of gravity features does not necessarily rate their importance and the co-incidence of geophysical features is not an essential requirement. The Carrapateena discovery appears on or near a very weak gravity feature. Such a subtle feature contrasts markedly with the strong anomalies in both magnetic and gravity surveys associated with Olympic Dam.
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Olympic Domain Gravity (Please click above for a larger image) |
Olympic Domain TMI (Please click above for a larger image) |