The Gawler Craton Project [Part]. Data release made in lieu of partial surrender/joint annual reports for the period 3/2/2010 to 1/2/2019, plus letters giving permission to release owed licence partial relinquishment and surrender reports.
Published: 23 Jun 1915 Created: 12 Nov 2024 Revised: 12 Nov 2024

As part of a regional search for possible major deposits of IOCG type mineralisation, Golden Cross Resources took up six exploration tenements in the northern Gawler Craton that lie to the north and north-east of Coober Pedy, and which are within...

As part of a regional search for possible major deposits of IOCG type mineralisation, Golden Cross Resources took up six exploration tenements in the northern Gawler Craton that lie to the north and north-east of Coober Pedy, and which are within or close to the margins of the G2 continental scale structural corridor. The company then began progressively identifying drill targets based on the intensity of gravity anomalies and the presence of coincident or adjacent magnetic features potentially indicating the presence of large volumes of hematite in major breccia zones hosting chalcopyrite – chalcocite – bornite mineralisation with associated gold, uranium and rare earth minerals. Field work commenced in February 2011 with the acquisition of semi-regional infill gravity coverage on three grids, comprising a total of 510 stations read at 400 m x 800 m spacing. The new gravity data was then merged with the PACE regional dataset and was modelled by Jim Hanneson to identify possible prospective coincident potential field anomalies. 11 such targets were found and ranked for their significance: five were regarded as immediately suitable for drill testing. Two large gravity anomalies were outlined on Oolgelima Hill EL 4427, out of which the favoured SR 11 anomaly (2 mGal Bouguer; 1 mGal residual amplitude) covers an extent of 1.8 km x 1.4 km aligned SW-NE, coinciding closely with a 200 nT magnetic feature. On 31/1/2012, Golden Cross submitted a proposal for PACE 2020 - subsidised partial funding of higher risk exploratory drilling at the Algebullcullia, Mount Euee and Stuart Range IOCG targets on its Coober Pedy Project tenements, and on 3/5/2012 the company received notification of DMITRE's approval of this proposal as PACE Year 7 Drilling Project DPY7-19. Subsequently, during May-June 2013, Golden Cross completed the drilling of 3 vertical rotary mud - precollared diamond core holes with a total penetration of 1412.4 m (including 896.0 m of mostly NQ coring). These drillholes tested three separate basement targets, and were sampled at 1 metre intervals through both the sedimentary cover and the cored bedrock for geochemical analysis. Each hole was progressed for ~250 m into the basement. The basement lithologies encountered by the three holes consist of variably altered gneissic granofels and biotite schists containing numerous quartz-K feldspar pegmatitic zones. Haematitic dusting of K feldspar is common to the basement lithologies in all three holes. No significant IOCG or other types of mineralisation were found, although assaying of the SRE001 drill core returned elevated copper values from the depth interval 164–174 m that peak at 1320 ppm Cu. This result was correlated with observed disseminated pyrite plus trace chalcopyrite and bornite in sericite-chlorite altered metavolcanic rocks. A second zone of elevated copper values occurs from 365-369 m depth, peaking at 1710 ppm Cu. Hole SRE001 is located 25 km north-west of BHP Minerals' historical 1992 percussion drillhole NC9202 put down on EL 1765, in which encouraging base metal and rare earth mineralisation was also encountered. Because of these two holes finding sub-economic mineralisation, it was believed that carrying out additional drilling from sites located ~300 m to the north-east and east of hole SRE001 might provide valuable evidence for vectoring towards an IOCG deposit, because the intense rock alteration seen in that hole's drill core suggests proximity to a major fluid source. A PACE subsidy total amount of $50,000 was awarded to Golden Cross for defraying its 2013 drilling costs, and a Final Report for Project DPY7-19 was submitted to DMITRE on 26/11/2013 (cf. Env 12624). Acting on Jim Hanneson's recommendation, given following his post-drill review and upgraded modelling of the project's gravity and magnetic datasets, detailed infill gravity readings were acquired on five prospect grids during May 2013, when 348 more stations were read at 200 m x 200 m and 100 m x 100 m station spacings. Some of the previously ranked target anomalies were downgraded, but others emerged as of strong interest, including a possible Hillside type IOCG setting at Mungutana East, plus other anomalies at S Dam, Yadmalpi and SR 11 North. Data obtained from the 2013 field work continued to be evaluated throughout 2014, along with office-based activities concerned with resolving the legalities and logistics of gaining land access onto certain parts of the Project licence areas. Jim Hanneson undertook further refinement of his set of anomaly inversion models using the 2013 infill gravity data. In consequence of his modified recommendations, fresh plans were made by Golden Cross for doing follow-up drilling at SR 11 Bore prospect and for new drilling at Oolgelima Hill Central and South prospects. Several companies inspected the licensee's data with the intent of negotiating terms for a possible earn-in joint venture; one company undertook a drill core review at the Mount Barry Station field storage area. During January 2015, a submission for drill project funding under the PACE 2015 programme, of the five preferred targets defined at Oolgelima Hill and Codna Hill, was submitted to DSD for consideration.

More +

About this record

Record No mesac25372
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Vector Research Pty Ltd;AsIs International Pty Ltd;Daishsat Geodetic Surveyors;PGN Geoscience;Adelaide Mining Geophysics Pty Ltd
Sponsor Golden Cross Operations Pty Ltd
Tenement
Tenement Holder Golden Cross Operations Pty Ltd
Operator Golden Cross Resources Ltd
Geological Province
Mine Name Mungutana Dam prospect;Algebullcullia prospect;Mount Euee prospect;Stuart Range SR11 Bore prospect;Oolgelima Hill Central prospect;Oolgelima Hill South prospect;Yadmalpi prospect;S Dam prospect;Mungutana East prospect
Stratigraphy Hiltaba Suite
Commodity
Notes
Notes: EL 4426 (Warriner Creek) was surrendered on 26/1/2014, following the assessment of its airborne magnetic data, owing to the perceived  low priority of its sole coincident gravity/magnetic anomaly and an estimated basement depth in the...

Notes: EL 4426 (Warriner Creek) was surrendered on 26/1/2014, following the assessment of its airborne magnetic data, owing to the perceived low priority of its sole coincident gravity/magnetic anomaly and an estimated basement depth in the eastern part of >500 m. The first and second partial relinquishments of the subject EL 4431 occurred at licence renewals made on 1/2/2014 and 1/2/2015 respectively. This tenement has now been renewed for a second 5-year term as EL 5572. A first partial relinquishment of EL 4695 (Giddinna) took place on 27/2/2015. Includes: - Ailleres, L. and Betts, P., February 2012. Geophysical interpretation and modelling of potential IOCG targets within Golden Cross Resources' Oolgelima-Giddinna EL group in South Australia (PGN Geoscience consultants' report for Golden Cross Resources). Appendix 1 of ELs third joint annual report to 1/2/2013. 27 pages, 20 fig; - Hanneson, J.E., November 2012 - January 2013. 4 x memoranda re. density-susceptibility modelling of various prospects and geophysical anomalies within the Gawler Craton Project tenements (Adelaide Mining Geophysics consultant's reports for Golden Cross). Appcs 2-5 of project ELs third joint annual report to 1/2/2013. 149 pages, figures, 3 ref, tables. - Hanneson, J.E., April 2014. 3 x memoranda re. density-susceptibility modelling of the SR 11, Oolgelima South and Oolgelima central prospects within EL 4427 (Adelaide Mining Geophysics consultant's reports for Golden Cross). Appcs 2-4 of project ELs fifth joint annual report to 1/2/2015. 93 pages, figures, 6 ref, tables. Geographic Locality: Codna Hill;Warriner Creek;Oolgelima Hill;Giddi Giddinna;Northern Stuart Range;Marpoo Dam;Mount Euee;Algebullcullia;Woomera Prohibited Area;1961 Oodnadatta Aerial Magnetic Survey;1994 SAEI Area E1 Aerial Magnetic Survey;1999 TEiSA Area D2 Aerial Magnetic Survey;1999 TEiSA Area D2 Aerial Radioactivity Survey;2007 PACE Northern Olympic Domain Gravity Survey;2011 Oolgelima Infill [to PACE NOD] Gravity Survey;2013 Oolgelima Hill and Codna Hill Gravity Surveys Doc No: Env 12153 Drillhole: ALG001;(279096);EUE001;(279095);SRE001;(279097);BHP Minerals NC9202 Drillhole Unit No: 5840 00715;5940 00063;5840 00714;5940 00029

More +

Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac25372
Citation Ferris, B.;Coopes, G.A.;Mudge, S.;Hutchens, M.F.;Stanton-Cook, K.;Ailleres, L.;Betts, P.;Hanneson, J.E. 1915. The Gawler Craton Project [Part]. Data release made in lieu of partial surrender/joint annual reports for the period 3/2/2010 to 1/2/2019, plus letters giving permission to release owed licence partial relinquishment and surrender reports. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac25372

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[135.5,-29.5],[141,-29.5],[141,-29],[135.5,-29],[135.5,-29.5]]]}
Purpose

                    
                    

                    
                  
Lineage