Oolgelima Creek. First annual report plus final report to licence expiry/full surrender, for the period 31/8/2012 to 30/8/2014.
Published: 10 Oct 1914 Created: 12 Nov 2024 Revised: 12 Nov 2024

Three separate small areas on the eastern edge of the Stuart Range, that are located 30 to 45 km north and north-east of Coober Pedy, have been explored both for possible buried Proterozoic basement-hosted IOCG-style mineralisation and for large...

Three separate small areas on the eastern edge of the Stuart Range, that are located 30 to 45 km north and north-east of Coober Pedy, have been explored both for possible buried Proterozoic basement-hosted IOCG-style mineralisation and for large sedimentary evaporite occurrences of Mg-sulphate salts. Prior to and during the first licence year, Minotaur's review of open file geophysical and geological data and historic exploration reports for the selected areas revealed that they had on record promising yet barely tested shows of both rare earth element - rich bedrock hydrothermal alteration iron oxide mineral assemblages and, within the cover, secondary stratiform magnesium sulphate precipitates. Reports reviewed mentioned that significant quantities of Mg-sulphate salts had been defined at Giddi Giddina Creek more than 25 years ago by CRA Exploration, and were regarded as forming a geologically rare mineral deposit. The principal magnesium evaporite mineral species then found to be present are bloedite (MgSO4Na2SO4.4H2O), epsomite (MgSO4.7H2O) and hexahydrite (MgSO4.6H2O), and Minotaur thought it likely that additional occurrences would exist within the region, so it took out two licences to cover perceived prospective ground, the subject EL 4980 plus a much larger EL 4981 located further east along Giddi Giddina Creek where it debouches into the Lake Cadibarrawirracanna salina. Near a NW trending fault with associated flanking magnetic and gravity high anomalies which lies close to the western boundary of Minotaur's current EL 4981, magnetite and pyrite-rich alteration which was encountered by BHP Minerals in 1992 within its drillhole NC9202 was found to contain highly anomalous rare earths (up to 13,600 ppm Ce and 11,900 ppm La). Minotaur believed that this could indicate the former passage through the fault zone of IOCG-style hydrothermal fluids which were consistent in character with those it had detected evidence of during work done further south within the Mount Woods Inlier. It therefore proposed that discrete magnetic and gravity anomalies proximal to NW-trending faults should be the focus of future investigations for Cu-Au mineralisation, and recommended that detailed gravity surveys be acquired to determine if haematite-rich (+Cu, Au, REE) alteration is also present. North-east of Coober Pedy in the vicinity of Minotaur's ELs 4980 and 4981, the drilled depth to the top of basement is only around 40 m in the west, but heading eastwards from there it increases dramatically to more than 400 m, especially across a series of NW-trending faults. Adjacent magnetic and gravity anomalies are broad and poorly defined. During licence Year 2, no work was done. Tenure was allowed to lapse at the end of the year.

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Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac25477
Citation Flint, R.B.;Cronin, P. 1914. Oolgelima Creek. First annual report plus final report to licence expiry/full surrender, for the period 31/8/2012 to 30/8/2014. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac25477

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[134.5,-29],[135.5,-29],[135.5,-28.5],[134.5,-28.5],[134.5,-29]]]}
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