Significant exploration focussed on: 路 stratabound 'Telfer-style' gold in Adelaidean metasediments in the Nackara Arc, using stratiform or stratabound structurally-controlled genetic models; and structurally controlled gold and base metal...
Significant exploration focussed on: 路 stratabound 'Telfer-style' gold in Adelaidean metasediments in the Nackara Arc, using stratiform or stratabound structurally-controlled genetic models; and structurally controlled gold and base metal mineralisation in Adelaidean metasediments north of the Anabama - Redan Fault Zone; with lesser emphasis on gold mineralisation related to alteration zones associated with the Anabama Granite路 volcanic-hosted base metals in the Adelaidean Boucaut Volcanics north of the Anabama -Redan Fault Zone; 路 syngenetic gold associated with Adelaidean Braemar Ironstone facies north of the Anabama - Redan Fault Zone; . heavy mineral accumulations in Pliocene sediments (Parilla Sand and Loxton Sand) along the northern margin of the Tertiary Murray Basin; and . diamonds associated with intrusive lamprophyric kimberlites, especially in the western Nackara Arc. Many explorers had noted similarities between the minor gold occurrences in the Nackara Arc of SA and the gold deposits at Telfer in WA, in particular the stratiform and stratabound, ferruginous, Au-bearing sulphidic quartz veining of anticline cores in mildly metamorphosed Late Proterozoic metasediments. Early exploration focussed on stratiform gold, especially as possible along-strike extensions from known minor mineralisation. With subsequent recognition of significant structural controls to ore emplacement at Telfer, later SA-based exploration switched to stratabound but structurally-controlled gold targets. No significant discoveries were reported, but potential was indicated or remains untested at: . the Hill Grange/Agross copper mines, where Cu-Au occurs in veins on local anticlines (EL 1416 Bendigo Station, on ORROROO 1:250 000 map sheet); 路 Kirkeek's Treasure mine, along strike extensions of the original workings (EL 584 Mount Victor, EL 939 Mount Victor); and 路 the Golden Sophia/Luron prospects, which show low-grade but pervasive mineralisation (EL 1528 Giles Nob). In many cases, gold exploration was accompanied by base metal exploration, and significant anomalism was indicated at: 路 Echelon Grid and Gorge Grid, near Wadnaminga, with Cu-Zn values (EL 1102 Copperlinka); 路 several localities on EL 1376 Hope Bank, with As/Sb/Zn/Cu/Pb values; and . Mafeking, with Zn-Pb-Ag values (EL 1416 Bendigo Station, on ORROROO 1:250 000 map sheet). Significant gold and/or base metal prospects indicated by exploration in Adelaidean metasediments and metavolcanics to the north of the Anabama - Redan Fault Zone, which seem to be either structurally-controlled or associated with alteration around Delamerian granites, etc, included: 路 ?structurally controlled (or ?stratabound) Cu in quartz-limonite veining in schists and amphibolites at Anabama Copper Mine (EL 312, 508, 937 Cronje Dam, then EL 1462 Lilydale); 路 anomalous Cu(-Au) in Boucaut Volcanics at White Rock (EL 1462 Lilydale); . disseminated pyrite-chalcopyrite in schist at Two Brothers (EL 312, 508, 937 Cronje Dam); 路 pervasive slightly anomalous Cu-Zn at Division Dam / Anomaly F (EL 312, 508, 937 Cronje Dam); and 路 anomalous Cu-Zn-Pb-Au, structurally controlled and related to alteration associated with a granitic intrusion, in metasediments at Maldorky - Alderman's (EL 1611 Mutooroo Station).
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