Data release - as updated [made at SA Director of Mines' discretion] : The North-western Murray Basin Project. Joint annual reports for the period 29/8/2012 to 28/8/2014.
Published: 28 Feb 1915 Created: 12 Nov 2024 Revised: 12 Nov 2024

During Year 7 of the project, Goldfields did no more field work, but undertook office-based analyses of bedrock geochemical and geological data obtained in its 2012 aircore drilling campaign. Image processing and interpretation of the Canegrass...

During Year 7 of the project, Goldfields did no more field work, but undertook office-based analyses of bedrock geochemical and geological data obtained in its 2012 aircore drilling campaign. Image processing and interpretation of the Canegrass Gravity Survey data was also performed. After Iluka Resources took over managing ongoing exploration, it began to conduct grassroots HM drilling along the north-western margin of the Murray Basin in September-October 2013. This aimed to test whether the target Miocene-Pliocene Loxton-Parilla Sands were developed near an interpreted basement headland in the region north of Morgan. In order to expedite exploration of such a large ground holding, this first stage of drilling focussed on tenements where Native Title had been extinguished. An additional task was to check drill at locations where Goldfields Australasia had previously logged notable intra-cover occurrences of “black mineral” seen in its drilling. 96 vertical open aircore holes were drilled along five regional traverses, for a total penetration of 3662 m, the majority of holes being terminated in dark fossiliferous marl and clay of the Winnambool Formation or in the underlying Murray Group limestone. Isolated buried occurrences of regressive shoreface marine sands were found, but no significant HM mineralisation was intersected within their foreshore facies strata. Two of the holes drilled on EL 4452 were sited just west of Morgan specifically to gather stratigraphic information about the southern extent of the Loxton-Parilla Sands in the project area, but neither hole encountered them. Two samples (R2014359 and R2014360) of sulphide veined drill core from Goldfields' drillhole DEL10ACD001 at its Haylands prospect were taken from the DMITRE Core Library by Iluka’s alternative commodities division, to send out for a petrological thin section analysis. Results of the analysis are included herein. They confirmed the suspected altered mafic volcanic host and the microscopic but significant chalcopyrite content in the sheared vein fill material. During Year 8 of the project, over the second half of 2013, Iluka undertook the remainder of its Stage 1 HM exploratory drilling campaign, completing an additional 27 vertical NQ aircore open holes for 830 m along the aforesaid five regional traverses ST073 - ST077. No significant HM were encountered, despite suitable host strata being disclosed in several places. A probable palaeo-headland was encountered on EL 5182 along traverse ST075, where Adelaidean schist was reached in hole S02126 at a depth of only 12 m and was otherwise subcropping shallowly between holes S02124 and S02129. A Stage 2 exploratory drilling campaign was conducted by Iluka during the first half of 2014, when 127 more vertical NQ aircore open holes were drilled for 7985.5 m at ~160 m spacing along another twelve regional traverses, ST081, ST082 and ST084 - ST093. The delay arising in doing the drilling here was because these traverses crossed tenements where Native Title agreement land access conditions required Iluka to perform aboriginal heritage protection clearance surveys in order to progress on-ground works. No significant HM mineralisation was encountered in the Stage 2 holes. It was found that GoldFields' often previously reported 'black mineral' intercepts relate to transported alluvial fine ironstone detritus deposited within the Pleistocene Pooraka Formation - along traverse ST081, for example, up to 7% Fe, now existing as maghemite, occurs within the Pooraka Formation interval of hole S02212. Well developed, fine to medium grained foreshore facies sands were intersected within the Loxton-Parilla Sand along nine of the traverses, but on traverse ST086 this favourable geological facies changed, the winnowed sands becoming replaced by very high slime sandy clays and clayey sands. The Loxton-Parilla Sands appeared to pinch out or are absent along traverses ST087, ST089 and ST093. Minor amounts of HM were intersected on traverse ST088 in the five northernmost holes (S02185 - S02189), yielding a best intercept in hole S02186 of 9 m @ 0.9% HM from 63.5 m depth, this including 1.5 m @ 2.3% HM from 64.5 m. However, the sediments' HM fraction in all intercepts is dominated by fragmentary rock detritus and transported iron oxides. The foreshore facies sand development increases to the north along ST088, with the sands intersected in hole S02189 being very well developed. Evidence of a stacked shoreface depositional sequence was also seen in hole S02188, which may indicate active faulting in the region during deposition of the Loxton-Parilla Sands. It was recommended that in addition to doing infill drilling and redrills, undertaking drilling to the north of S02189 should be considered to delineate the basin margin and to investigate the potential for stacked sequences related to faulting along the basin margin.

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About this record

Record No mesac29453
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Pontifex and Associates Pty Ltd
Sponsor Iluka Resources Limited
Tenement
Tenement Holder Gold Fields Australasia Pty Ltd;Iluka Resources Limited
Operator Gold Fields Australasia Pty Ltd;Iluka Resources Limited
Geological Province Murray Basin
Mine Name
Stratigraphy
Commodity
Notes
Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88...

Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88 of the Mining Regulations 2011. On 8/7/2013, Iluka Resources Limited purchased all ten of the project tenements from grant licensee Goldfields Australasia, and the exploration target then changed from orogenic gold to heavy mineral sands. Geographic Locality: North-western Murraylands;Sunset Country;Pine Valley Station;Riverland;Morgan;Stock Route Road;Haylands Station;Quondong Fault;Florieton Fault;Teal Flat Shear Zone Doc No: Env 11448 Drillhole: S02008 - S02100;(311308 - 311387);(311635 - 311641);(311761);(337213 - 337216);S02103 - S02187;(311389 - 311469);(311642 - 311645);S02211 - S02224;(311470 - 311487)

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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/mesac29453
Citation Smith, P.;Purvis, A.C.;Pontifex, I.R.;Jones, W. 1915. Data release - as updated [made at SA Director of Mines' discretion] : The North-western Murray Basin Project. Joint annual reports for the period 29/8/2012 to 28/8/2014. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac29453

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[139,-35],[141,-35],[141,-32.5],[139,-32.5],[139,-35]]]}
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Lineage